diff --git a/scripts/gen_goldens.py b/scripts/gen_goldens.py
new file mode 100644
index 0000000..eed24fb
--- /dev/null
+++ b/scripts/gen_goldens.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+"""Regenera `src/sowai_fiscal/goldens/caso_*.expected.xml` a partir dos
+`caso_*.input.json` correspondentes. Uso ÚNICO hoje (fixar o corpus golden,
+Task 2 do plano F1) e sempre que uma NT mudar o leiaute DE PROPÓSITO --
+nunca para "corrigir" um teste vermelho sem entender por que o XML mudou.
+
+    uv run python scripts/gen_goldens.py
+"""
+from pathlib import Path
+
+from sowai_fiscal.golden_helpers import dados_from_json, serialize_infnfe
+
+_GOLDENS_DIR = Path(__file__).resolve().parent.parent / "src" / "sowai_fiscal" / "goldens"
+
+
+def main() -> None:
+    inputs = sorted(_GOLDENS_DIR.glob("caso_*.input.json"))
+    if not inputs:
+        raise SystemExit(f"nenhum caso_*.input.json encontrado em {_GOLDENS_DIR}")
+    for input_path in inputs:
+        expected_path = input_path.with_name(input_path.name.replace(".input.json", ".expected.xml"))
+        dados = dados_from_json(input_path)
+        xml_bytes = serialize_infnfe(dados)
+        expected_path.write_bytes(xml_bytes)
+        print(f"{input_path.name} -> {expected_path.name} ({len(xml_bytes)} bytes)")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/sowai_fiscal/golden_helpers.py b/src/sowai_fiscal/golden_helpers.py
new file mode 100644
index 0000000..26c7249
--- /dev/null
+++ b/src/sowai_fiscal/golden_helpers.py
@@ -0,0 +1,173 @@
+"""Helpers do corpus golden (`sowai_fiscal.goldens/`): carregam um
+`DadosEmissao` a partir de um JSON determinístico e serializam o `Nfe`
+resultante do `build_nfe` na MESMA configuração canônica que o auto usa em
+`fiscal/emissao.py::_serialize_nfe` antes de assinar (`SerializerConfig
+(xml_declaration=False, indent=None)`, `ns_map={None: NFE_NAMESPACE}`).
+
+Módulo do PACOTE (não de `tests/`) de propósito: tanto o teste de goldens
+desta lib quanto o teste de paridade do produto consumidor (auto, Task 4 do
+plano F1) importam `sowai_fiscal.golden_helpers` para ler exatamente os
+mesmos arquivos via `importlib.resources` -- zero cópia que possa divergir.
+
+O JSON de input espelha 1:1 os dataclasses de `sowai_fiscal.xml_builder`
+(`DadosEmissao`, `EmitenteData`, `DestinatarioData`, `ItemData`,
+`PagamentoData`) e `sowai_fiscal.resolver` (`FiscalResult`, `TributoLinha`)
+-- é o `DadosEmissao` JÁ RESOLVIDO (o motor de regras não roda aqui; cada
+item já traz seu `fiscal_result`), exatamente o formato que o orquestrador
+de emissão do auto monta antes de chamar `build_nfe`.
+"""
+import json
+from decimal import Decimal
+from pathlib import Path
+from typing import Any
+
+from sowai_fiscal.resolver import FiscalResult, TributoLinha
+from sowai_fiscal.xml_builder import (
+    DadosEmissao,
+    DestinatarioData,
+    EmitenteData,
+    ItemData,
+    PagamentoData,
+    build_nfe,
+)
+from xsdata.formats.dataclass.serializers import XmlSerializer
+from xsdata.formats.dataclass.serializers.config import SerializerConfig
+
+# A MESMA config/namespace que `app/modules/fiscal/emissao.py::_serialize_nfe`
+# usa no auto -- conferida lá antes de fixar aqui (ver docstring do módulo).
+NFE_NAMESPACE = "http://www.portalfiscal.inf.br/nfe"
+
+
+def _dec(value: Any) -> Decimal | None:
+    if value is None:
+        return None
+    return Decimal(str(value))
+
+
+def _tributo_from_dict(data: dict) -> TributoLinha:
+    return TributoLinha(
+        tax_domain=data["tax_domain"],
+        cst=data.get("cst"),
+        csosn=data.get("csosn"),
+        base_calc=_dec(data["base_calc"]),
+        base_calc_percent=_dec(data["base_calc_percent"]),
+        aliquota=_dec(data.get("aliquota")),
+        valor=_dec(data["valor"]),
+        mva=_dec(data.get("mva")),
+        aliquota_st=_dec(data.get("aliquota_st")),
+        fcp_percent=_dec(data.get("fcp_percent")),
+        codigo_beneficio=data.get("codigo_beneficio"),
+        rule_id=data["rule_id"],
+    )
+
+
+def _fiscal_result_from_dict(data: dict) -> FiscalResult:
+    return FiscalResult(
+        cfop=data["cfop"],
+        cst=data.get("cst"),
+        csosn=data.get("csosn"),
+        origem=data.get("origem"),
+        consumidor_final=data["consumidor_final"],
+        indicador_ie=data["indicador_ie"],
+        tributos=[_tributo_from_dict(t) for t in data["tributos"]],
+    )
+
+
+def _item_from_dict(data: dict) -> ItemData:
+    return ItemData(
+        codigo=data["codigo"],
+        descricao=data["descricao"],
+        ncm=data["ncm"],
+        cfop=data["cfop"],
+        unidade_comercial=data["unidade_comercial"],
+        unidade_tributavel=data["unidade_tributavel"],
+        quantidade=_dec(data["quantidade"]),
+        valor_unitario=_dec(data["valor_unitario"]),
+        fiscal_result=_fiscal_result_from_dict(data["fiscal_result"]),
+        gtin=data.get("gtin"),
+        cest=data.get("cest"),
+        peso_liquido_kg=_dec(data.get("peso_liquido_kg")),
+        peso_bruto_kg=_dec(data.get("peso_bruto_kg")),
+    )
+
+
+def _emitente_from_dict(data: dict) -> EmitenteData:
+    return EmitenteData(
+        cnpj=data["cnpj"],
+        razao_social=data["razao_social"],
+        nome_fantasia=data.get("nome_fantasia"),
+        ie=data["ie"],
+        crt=data["crt"],
+        address_street=data["address_street"],
+        address_number=data["address_number"],
+        address_complement=data.get("address_complement"),
+        address_district=data["address_district"],
+        address_city=data["address_city"],
+        address_state=data["address_state"],
+        address_zip=data["address_zip"],
+        address_city_ibge_code=data["address_city_ibge_code"],
+        fone=data.get("fone"),
+    )
+
+
+def _destinatario_from_dict(data: dict | None) -> DestinatarioData | None:
+    if data is None:
+        return None
+    return DestinatarioData(
+        nome=data["nome"],
+        cnpj=data.get("cnpj"),
+        cpf=data.get("cpf"),
+        indicador_ie=data["indicador_ie"],
+        ie=data.get("ie"),
+        address_street=data.get("address_street"),
+        address_number=data.get("address_number"),
+        address_complement=data.get("address_complement"),
+        address_district=data.get("address_district"),
+        address_city=data.get("address_city"),
+        address_state=data.get("address_state"),
+        address_zip=data.get("address_zip"),
+        address_city_ibge_code=data.get("address_city_ibge_code"),
+        email=data.get("email"),
+    )
+
+
+def _pagamento_from_dict(data: dict) -> PagamentoData:
+    return PagamentoData(
+        tpag=data["tpag"],
+        valor=_dec(data["valor"]),
+        indpag=data.get("indpag", "0"),
+    )
+
+
+def dados_from_json(path: Path) -> DadosEmissao:
+    """Carrega um `DadosEmissao` completo (já resolvido) a partir do JSON
+    golden em `path`. Campos opcionais do dataclass que o JSON omite caem
+    no default do próprio `DadosEmissao`."""
+    raw = json.loads(Path(path).read_text(encoding="utf-8"))
+    kwargs: dict[str, Any] = dict(
+        emitente=_emitente_from_dict(raw["emitente"]),
+        itens=[_item_from_dict(i) for i in raw["itens"]],
+        pagamento=_pagamento_from_dict(raw["pagamento"]),
+        ambiente=raw["ambiente"],
+        chave_acesso=raw["chave_acesso"],
+        numero=raw["numero"],
+        serie=raw["serie"],
+        cnf=raw["cnf"],
+        dh_emi=raw["dh_emi"],
+        uf_destino_tipo=raw["uf_destino_tipo"],
+        destinatario=_destinatario_from_dict(raw.get("destinatario")),
+    )
+    for optional in ("nat_op", "tp_emis", "ind_final", "ind_pres", "fin_nfe", "ver_proc"):
+        if optional in raw:
+            kwargs[optional] = raw[optional]
+    return DadosEmissao(**kwargs)
+
+
+def serialize_infnfe(dados: DadosEmissao) -> bytes:
+    """`DadosEmissao` -> XML pré-assinatura, bytes UTF-8. Config e namespace
+    IDÊNTICOS a `emissao.py::_serialize_nfe` no auto -- é o que torna este
+    XML comparável byte a byte com o gerado pelo produto consumidor."""
+    nfe = build_nfe(dados)
+    config = SerializerConfig(xml_declaration=False, indent=None)
+    xml_str = XmlSerializer(config=config).render(nfe, ns_map={None: NFE_NAMESPACE})
+    return xml_str.encode("utf-8")
diff --git a/src/sowai_fiscal/goldens/caso_com_ub.expected.xml b/src/sowai_fiscal/goldens/caso_com_ub.expected.xml
new file mode 100644
index 0000000..a4b1952
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_com_ub.expected.xml
@@ -0,0 +1 @@
+<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe versao="4.00" Id="NFe41260712345678000190550010000010051100000050"><ide><cUF>41</cUF><cNF>10000005</cNF><natOp>Venda</natOp><mod>55</mod><serie>1</serie><nNF>1005</nNF><dhEmi>2026-07-16T10:20:00-03:00</dhEmi><tpNF>1</tpNF><idDest>1</idDest><cMunFG>4106902</cMunFG><tpImp>1</tpImp><tpEmis>1</tpEmis><cDV>0</cDV><tpAmb>2</tpAmb><finNFe>1</finNFe><indFinal>1</indFinal><indPres>1</indPres><procEmi>0</procEmi><verProc>sowai-auto/1b.1</verProc></ide><emit><CNPJ>12345678000190</CNPJ><xNome>AUTOPECAS THIAGO LTDA</xNome><xFant>Thiago Auto Center</xFant><enderEmit><xLgr>Rua das Autopecas</xLgr><nro>1500</nro><xBairro>Centro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000000</CEP><cPais>1058</cPais><xPais>Brasil</xPais><fone>4133334444</fone></enderEmit><IE>1234567890</IE><CRT>1</CRT></emit><dest><CNPJ>99887766000155</CNPJ><xNome>NF-E EMITIDA EM AMBIENTE DE HOMOLOGACAO - SEM VALOR FISCAL</xNome><enderDest><xLgr>Av Cliente</xLgr><nro>50</nro><xBairro>Bairro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000100</CEP><cPais>1058</cPais><xPais>Brasil</xPais></enderDest><indIEDest>9</indIEDest></dest><det nItem="1"><prod><cProd>PC001</cProd><cEAN>SEM GTIN</cEAN><xProd>Filtro de oleo</xProd><NCM>84212300</NCM><CFOP>5102</CFOP><uCom>UN</uCom><qCom>1</qCom><vUnCom>100.00</vUnCom><vProd>100.00</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>1</qTrib><vUnTrib>100.00</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS><IBSCBS><CST>000</CST><cClassTrib>000001</cClassTrib><gIBSCBS><vBC>100.00</vBC><gIBSUF><pIBSUF>0.1000</pIBSUF><vIBSUF>10.00</vIBSUF></gIBSUF><gCBS><pCBS>0.9000</pCBS><vCBS>90.00</vCBS></gCBS></gIBSCBS></IBSCBS></imposto></det><total><ICMSTot><vBC>0.00</vBC><vICMS>0.00</vICMS><vICMSDeson>0.00</vICMSDeson><vFCP>0.00</vFCP><vBCST>0.00</vBCST><vST>0.00</vST><vFCPST>0.00</vFCPST><vFCPSTRet>0.00</vFCPSTRet><vProd>100.00</vProd><vFrete>0.00</vFrete><vSeg>0.00</vSeg><vDesc>0.00</vDesc><vII>0.00</vII><vIPI>0.00</vIPI><vIPIDevol>0.00</vIPIDevol><vPIS>0.00</vPIS><vCOFINS>0.00</vCOFINS><vOutro>0.00</vOutro><vNF>100.00</vNF></ICMSTot></total><transp><modFrete>9</modFrete></transp><pag><detPag><indPag>0</indPag><tPag>01</tPag><vPag>100.00</vPag></detPag></pag></infNFe></NFe>
\ No newline at end of file
diff --git a/src/sowai_fiscal/goldens/caso_com_ub.input.json b/src/sowai_fiscal/goldens/caso_com_ub.input.json
new file mode 100644
index 0000000..3aa1aa4
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_com_ub.input.json
@@ -0,0 +1,128 @@
+{
+  "emitente": {
+    "cnpj": "12345678000190",
+    "razao_social": "AUTOPECAS THIAGO LTDA",
+    "nome_fantasia": "Thiago Auto Center",
+    "ie": "1234567890",
+    "crt": "1",
+    "address_street": "Rua das Autopecas",
+    "address_number": "1500",
+    "address_complement": null,
+    "address_district": "Centro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000000",
+    "address_city_ibge_code": "4106902",
+    "fone": "4133334444"
+  },
+  "destinatario": {
+    "nome": "CLIENTE BALCAO LTDA",
+    "cnpj": "99887766000155",
+    "cpf": null,
+    "indicador_ie": "9",
+    "ie": null,
+    "address_street": "Av Cliente",
+    "address_number": "50",
+    "address_complement": null,
+    "address_district": "Bairro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000100",
+    "address_city_ibge_code": "4106902",
+    "email": null
+  },
+  "itens": [
+    {
+      "codigo": "PC001",
+      "descricao": "Filtro de oleo",
+      "ncm": "84212300",
+      "cfop": "5102",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "1",
+      "valor_unitario": "100.00",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "5102",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "100.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "7867351e-f79e-59c5-9e83-882563853fdd"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "100.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "050677c1-38dc-5246-a41c-d1b58017b0d0"
+          },
+          {
+            "tax_domain": "ibs",
+            "cst": null,
+            "csosn": null,
+            "base_calc": "100.00",
+            "base_calc_percent": "100",
+            "aliquota": "0.1000",
+            "valor": "10.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "f926eaa3-87a6-5acc-91dd-cbb9d52567f8"
+          },
+          {
+            "tax_domain": "cbs",
+            "cst": null,
+            "csosn": null,
+            "base_calc": "100.00",
+            "base_calc_percent": "100",
+            "aliquota": "0.9000",
+            "valor": "90.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "20f2bed4-07b3-5c41-b2ca-b659e0ae76a8"
+          }
+        ]
+      }
+    }
+  ],
+  "pagamento": {
+    "tpag": "01",
+    "valor": "100.00",
+    "indpag": "0"
+  },
+  "ambiente": "homologacao",
+  "chave_acesso": "41260712345678000190550010000010051100000050",
+  "numero": 1005,
+  "serie": 1,
+  "cnf": "10000005",
+  "dh_emi": "2026-07-16T10:20:00-03:00",
+  "uf_destino_tipo": "interna"
+}
diff --git a/src/sowai_fiscal/goldens/caso_devolucao_intra.expected.xml b/src/sowai_fiscal/goldens/caso_devolucao_intra.expected.xml
new file mode 100644
index 0000000..4b1e5fd
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_devolucao_intra.expected.xml
@@ -0,0 +1 @@
+<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe versao="4.00" Id="NFe41260712345678000190550010000010041100000045"><ide><cUF>41</cUF><cNF>10000004</cNF><natOp>Devolucao de venda</natOp><mod>55</mod><serie>1</serie><nNF>1004</nNF><dhEmi>2026-07-16T10:15:00-03:00</dhEmi><tpNF>1</tpNF><idDest>1</idDest><cMunFG>4106902</cMunFG><tpImp>1</tpImp><tpEmis>1</tpEmis><cDV>5</cDV><tpAmb>2</tpAmb><finNFe>1</finNFe><indFinal>1</indFinal><indPres>1</indPres><procEmi>0</procEmi><verProc>sowai-auto/1b.1</verProc></ide><emit><CNPJ>12345678000190</CNPJ><xNome>AUTOPECAS THIAGO LTDA</xNome><xFant>Thiago Auto Center</xFant><enderEmit><xLgr>Rua das Autopecas</xLgr><nro>1500</nro><xBairro>Centro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000000</CEP><cPais>1058</cPais><xPais>Brasil</xPais><fone>4133334444</fone></enderEmit><IE>1234567890</IE><CRT>1</CRT></emit><dest><CNPJ>99887766000155</CNPJ><xNome>NF-E EMITIDA EM AMBIENTE DE HOMOLOGACAO - SEM VALOR FISCAL</xNome><enderDest><xLgr>Av Cliente</xLgr><nro>50</nro><xBairro>Bairro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000100</CEP><cPais>1058</cPais><xPais>Brasil</xPais></enderDest><indIEDest>9</indIEDest></dest><det nItem="1"><prod><cProd>PC001</cProd><cEAN>SEM GTIN</cEAN><xProd>Filtro de oleo</xProd><NCM>84212300</NCM><CFOP>1202</CFOP><uCom>UN</uCom><qCom>1</qCom><vUnCom>75.00</vUnCom><vProd>75.00</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>1</qTrib><vUnTrib>75.00</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS></imposto></det><total><ICMSTot><vBC>75.00</vBC><vICMS>0.00</vICMS><vICMSDeson>0.00</vICMSDeson><vFCP>0.00</vFCP><vBCST>0.00</vBCST><vST>0.00</vST><vFCPST>0.00</vFCPST><vFCPSTRet>0.00</vFCPSTRet><vProd>75.00</vProd><vFrete>0.00</vFrete><vSeg>0.00</vSeg><vDesc>0.00</vDesc><vII>0.00</vII><vIPI>0.00</vIPI><vIPIDevol>0.00</vIPIDevol><vPIS>0.00</vPIS><vCOFINS>0.00</vCOFINS><vOutro>0.00</vOutro><vNF>75.00</vNF></ICMSTot></total><transp><modFrete>9</modFrete></transp><pag><detPag><indPag>0</indPag><tPag>90</tPag><vPag>75.00</vPag></detPag></pag></infNFe></NFe>
\ No newline at end of file
diff --git a/src/sowai_fiscal/goldens/caso_devolucao_intra.input.json b/src/sowai_fiscal/goldens/caso_devolucao_intra.input.json
new file mode 100644
index 0000000..d1e65fe
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_devolucao_intra.input.json
@@ -0,0 +1,115 @@
+{
+  "emitente": {
+    "cnpj": "12345678000190",
+    "razao_social": "AUTOPECAS THIAGO LTDA",
+    "nome_fantasia": "Thiago Auto Center",
+    "ie": "1234567890",
+    "crt": "1",
+    "address_street": "Rua das Autopecas",
+    "address_number": "1500",
+    "address_complement": null,
+    "address_district": "Centro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000000",
+    "address_city_ibge_code": "4106902",
+    "fone": "4133334444"
+  },
+  "destinatario": {
+    "nome": "CLIENTE BALCAO LTDA",
+    "cnpj": "99887766000155",
+    "cpf": null,
+    "indicador_ie": "9",
+    "ie": null,
+    "address_street": "Av Cliente",
+    "address_number": "50",
+    "address_complement": null,
+    "address_district": "Bairro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000100",
+    "address_city_ibge_code": "4106902",
+    "email": null
+  },
+  "itens": [
+    {
+      "codigo": "PC001",
+      "descricao": "Filtro de oleo",
+      "ncm": "84212300",
+      "cfop": "1202",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "1",
+      "valor_unitario": "75.00",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "1202",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "icms",
+            "cst": null,
+            "csosn": "102",
+            "base_calc": "75.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "38192a7c-594c-52c0-a911-29ab0385d848"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "75.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "48265596-d65d-5ce0-a201-06bfe961a4ef"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "75.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "94781077-adee-5dbd-aef4-b4aca3803a8a"
+          }
+        ]
+      }
+    }
+  ],
+  "pagamento": {
+    "tpag": "90",
+    "valor": "75.00",
+    "indpag": "0"
+  },
+  "ambiente": "homologacao",
+  "chave_acesso": "41260712345678000190550010000010041100000045",
+  "numero": 1004,
+  "serie": 1,
+  "cnf": "10000004",
+  "dh_emi": "2026-07-16T10:15:00-03:00",
+  "uf_destino_tipo": "interna",
+  "nat_op": "Devolucao de venda"
+}
diff --git a/src/sowai_fiscal/goldens/caso_fracao_centavo.expected.xml b/src/sowai_fiscal/goldens/caso_fracao_centavo.expected.xml
new file mode 100644
index 0000000..39f3b99
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_fracao_centavo.expected.xml
@@ -0,0 +1 @@
+<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe versao="4.00" Id="NFe41260712345678000190550010000010061100000066"><ide><cUF>41</cUF><cNF>10000006</cNF><natOp>Venda</natOp><mod>55</mod><serie>1</serie><nNF>1006</nNF><dhEmi>2026-07-16T10:25:00-03:00</dhEmi><tpNF>1</tpNF><idDest>1</idDest><cMunFG>4106902</cMunFG><tpImp>1</tpImp><tpEmis>1</tpEmis><cDV>6</cDV><tpAmb>2</tpAmb><finNFe>1</finNFe><indFinal>1</indFinal><indPres>1</indPres><procEmi>0</procEmi><verProc>sowai-auto/1b.1</verProc></ide><emit><CNPJ>12345678000190</CNPJ><xNome>AUTOPECAS THIAGO LTDA</xNome><xFant>Thiago Auto Center</xFant><enderEmit><xLgr>Rua das Autopecas</xLgr><nro>1500</nro><xBairro>Centro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000000</CEP><cPais>1058</cPais><xPais>Brasil</xPais><fone>4133334444</fone></enderEmit><IE>1234567890</IE><CRT>1</CRT></emit><dest><CNPJ>99887766000155</CNPJ><xNome>NF-E EMITIDA EM AMBIENTE DE HOMOLOGACAO - SEM VALOR FISCAL</xNome><enderDest><xLgr>Av Cliente</xLgr><nro>50</nro><xBairro>Bairro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000100</CEP><cPais>1058</cPais><xPais>Brasil</xPais></enderDest><indIEDest>9</indIEDest></dest><det nItem="1"><prod><cProd>PC900</cProd><cEAN>SEM GTIN</cEAN><xProd>Arruela avulsa</xProd><NCM>73181900</NCM><CFOP>5102</CFOP><uCom>UN</uCom><qCom>1.5</qCom><vUnCom>0.01</vUnCom><vProd>0.02</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>1.5</qTrib><vUnTrib>0.01</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS></imposto></det><det nItem="2"><prod><cProd>PC901</cProd><cEAN>SEM GTIN</cEAN><xProd>Arruela avulsa 2</xProd><NCM>73181900</NCM><CFOP>5102</CFOP><uCom>UN</uCom><qCom>1.5</qCom><vUnCom>0.01</vUnCom><vProd>0.02</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>1.5</qTrib><vUnTrib>0.01</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS></imposto></det><total><ICMSTot><vBC>0.04</vBC><vICMS>0.00</vICMS><vICMSDeson>0.00</vICMSDeson><vFCP>0.00</vFCP><vBCST>0.00</vBCST><vST>0.00</vST><vFCPST>0.00</vFCPST><vFCPSTRet>0.00</vFCPSTRet><vProd>0.04</vProd><vFrete>0.00</vFrete><vSeg>0.00</vSeg><vDesc>0.00</vDesc><vII>0.00</vII><vIPI>0.00</vIPI><vIPIDevol>0.00</vIPIDevol><vPIS>0.00</vPIS><vCOFINS>0.00</vCOFINS><vOutro>0.00</vOutro><vNF>0.04</vNF></ICMSTot></total><transp><modFrete>9</modFrete></transp><pag><detPag><indPag>0</indPag><tPag>01</tPag><vPag>0.04</vPag></detPag></pag></infNFe></NFe>
\ No newline at end of file
diff --git a/src/sowai_fiscal/goldens/caso_fracao_centavo.input.json b/src/sowai_fiscal/goldens/caso_fracao_centavo.input.json
new file mode 100644
index 0000000..709b80a
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_fracao_centavo.input.json
@@ -0,0 +1,180 @@
+{
+  "emitente": {
+    "cnpj": "12345678000190",
+    "razao_social": "AUTOPECAS THIAGO LTDA",
+    "nome_fantasia": "Thiago Auto Center",
+    "ie": "1234567890",
+    "crt": "1",
+    "address_street": "Rua das Autopecas",
+    "address_number": "1500",
+    "address_complement": null,
+    "address_district": "Centro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000000",
+    "address_city_ibge_code": "4106902",
+    "fone": "4133334444"
+  },
+  "destinatario": {
+    "nome": "CLIENTE BALCAO LTDA",
+    "cnpj": "99887766000155",
+    "cpf": null,
+    "indicador_ie": "9",
+    "ie": null,
+    "address_street": "Av Cliente",
+    "address_number": "50",
+    "address_complement": null,
+    "address_district": "Bairro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000100",
+    "address_city_ibge_code": "4106902",
+    "email": null
+  },
+  "itens": [
+    {
+      "codigo": "PC900",
+      "descricao": "Arruela avulsa",
+      "ncm": "73181900",
+      "cfop": "5102",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "1.5",
+      "valor_unitario": "0.01",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "5102",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "icms",
+            "cst": null,
+            "csosn": "102",
+            "base_calc": "0.02",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "0662ed57-174b-599c-9568-02b524b66edf"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "0.02",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "25880960-e53b-584a-b446-d0fe3fb79761"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "0.02",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "431b87af-2fa6-5413-a8b5-056a92035429"
+          }
+        ]
+      }
+    },
+    {
+      "codigo": "PC901",
+      "descricao": "Arruela avulsa 2",
+      "ncm": "73181900",
+      "cfop": "5102",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "1.5",
+      "valor_unitario": "0.01",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "5102",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "icms",
+            "cst": null,
+            "csosn": "102",
+            "base_calc": "0.02",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "863b3e8d-ab7f-5cab-b699-c443668a2d41"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "0.02",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "5e787f8f-1968-569b-8e2d-c7126a8d1e73"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "0.02",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "2c094bb0-fc8c-598a-9af8-3202fb24bba1"
+          }
+        ]
+      }
+    }
+  ],
+  "pagamento": {
+    "tpag": "01",
+    "valor": "0.04",
+    "indpag": "0"
+  },
+  "ambiente": "homologacao",
+  "chave_acesso": "41260712345678000190550010000010061100000066",
+  "numero": 1006,
+  "serie": 1,
+  "cnf": "10000006",
+  "dh_emi": "2026-07-16T10:25:00-03:00",
+  "uf_destino_tipo": "interna"
+}
diff --git a/src/sowai_fiscal/goldens/caso_padrao_inter.expected.xml b/src/sowai_fiscal/goldens/caso_padrao_inter.expected.xml
new file mode 100644
index 0000000..960174b
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_padrao_inter.expected.xml
@@ -0,0 +1 @@
+<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe versao="4.00" Id="NFe41260712345678000190550010000010021100000024"><ide><cUF>41</cUF><cNF>10000002</cNF><natOp>Venda</natOp><mod>55</mod><serie>1</serie><nNF>1002</nNF><dhEmi>2026-07-16T10:05:00-03:00</dhEmi><tpNF>1</tpNF><idDest>2</idDest><cMunFG>4106902</cMunFG><tpImp>1</tpImp><tpEmis>1</tpEmis><cDV>4</cDV><tpAmb>2</tpAmb><finNFe>1</finNFe><indFinal>1</indFinal><indPres>1</indPres><procEmi>0</procEmi><verProc>sowai-auto/1b.1</verProc></ide><emit><CNPJ>12345678000190</CNPJ><xNome>AUTOPECAS THIAGO LTDA</xNome><xFant>Thiago Auto Center</xFant><enderEmit><xLgr>Rua das Autopecas</xLgr><nro>1500</nro><xBairro>Centro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000000</CEP><cPais>1058</cPais><xPais>Brasil</xPais><fone>4133334444</fone></enderEmit><IE>1234567890</IE><CRT>1</CRT></emit><dest><CNPJ>11222333000144</CNPJ><xNome>NF-E EMITIDA EM AMBIENTE DE HOMOLOGACAO - SEM VALOR FISCAL</xNome><enderDest><xLgr>Av Paulista</xLgr><nro>1000</nro><xCpl>Sala 10</xCpl><xBairro>Bela Vista</xBairro><cMun>3550308</cMun><xMun>Sao Paulo</xMun><UF>SP</UF><CEP>01310000</CEP><cPais>1058</cPais><xPais>Brasil</xPais></enderDest><indIEDest>1</indIEDest><IE>1122334455</IE><email>compras@clienteinter.com.br</email></dest><det nItem="1"><prod><cProd>PC001</cProd><cEAN>SEM GTIN</cEAN><xProd>Filtro de oleo</xProd><NCM>84212300</NCM><CFOP>6102</CFOP><uCom>UN</uCom><qCom>10</qCom><vUnCom>75.00</vUnCom><vProd>750.00</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>10</qTrib><vUnTrib>75.00</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS></imposto></det><total><ICMSTot><vBC>750.00</vBC><vICMS>0.00</vICMS><vICMSDeson>0.00</vICMSDeson><vFCP>0.00</vFCP><vBCST>0.00</vBCST><vST>0.00</vST><vFCPST>0.00</vFCPST><vFCPSTRet>0.00</vFCPSTRet><vProd>750.00</vProd><vFrete>0.00</vFrete><vSeg>0.00</vSeg><vDesc>0.00</vDesc><vII>0.00</vII><vIPI>0.00</vIPI><vIPIDevol>0.00</vIPIDevol><vPIS>0.00</vPIS><vCOFINS>0.00</vCOFINS><vOutro>0.00</vOutro><vNF>750.00</vNF></ICMSTot></total><transp><modFrete>9</modFrete></transp><pag><detPag><indPag>0</indPag><tPag>17</tPag><vPag>750.00</vPag></detPag></pag></infNFe></NFe>
\ No newline at end of file
diff --git a/src/sowai_fiscal/goldens/caso_padrao_inter.input.json b/src/sowai_fiscal/goldens/caso_padrao_inter.input.json
new file mode 100644
index 0000000..69af378
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_padrao_inter.input.json
@@ -0,0 +1,115 @@
+{
+  "emitente": {
+    "cnpj": "12345678000190",
+    "razao_social": "AUTOPECAS THIAGO LTDA",
+    "nome_fantasia": "Thiago Auto Center",
+    "ie": "1234567890",
+    "crt": "1",
+    "address_street": "Rua das Autopecas",
+    "address_number": "1500",
+    "address_complement": null,
+    "address_district": "Centro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000000",
+    "address_city_ibge_code": "4106902",
+    "fone": "4133334444"
+  },
+  "destinatario": {
+    "nome": "CLIENTE INTERESTADUAL LTDA",
+    "cnpj": "11222333000144",
+    "cpf": null,
+    "indicador_ie": "1",
+    "ie": "1122334455",
+    "address_street": "Av Paulista",
+    "address_number": "1000",
+    "address_complement": "Sala 10",
+    "address_district": "Bela Vista",
+    "address_city": "Sao Paulo",
+    "address_state": "SP",
+    "address_zip": "01310000",
+    "address_city_ibge_code": "3550308",
+    "email": "compras@clienteinter.com.br"
+  },
+  "itens": [
+    {
+      "codigo": "PC001",
+      "descricao": "Filtro de oleo",
+      "ncm": "84212300",
+      "cfop": "6102",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "10",
+      "valor_unitario": "75.00",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "6102",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "1",
+        "tributos": [
+          {
+            "tax_domain": "icms",
+            "cst": null,
+            "csosn": "102",
+            "base_calc": "750.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "033f9888-3e26-5b16-bf6f-3d8573d02fb1"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "750.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "2028ef78-a3cd-59ed-b2b9-09f04a3e433f"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "750.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "a0c97f3b-7938-5168-94c1-f43011671136"
+          }
+        ]
+      }
+    }
+  ],
+  "pagamento": {
+    "tpag": "17",
+    "valor": "750.00",
+    "indpag": "0"
+  },
+  "ambiente": "homologacao",
+  "chave_acesso": "41260712345678000190550010000010021100000024",
+  "numero": 1002,
+  "serie": 1,
+  "cnf": "10000002",
+  "dh_emi": "2026-07-16T10:05:00-03:00",
+  "uf_destino_tipo": "interestadual",
+  "ind_final": "1"
+}
diff --git a/src/sowai_fiscal/goldens/caso_padrao_intra.expected.xml b/src/sowai_fiscal/goldens/caso_padrao_intra.expected.xml
new file mode 100644
index 0000000..31e77ea
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_padrao_intra.expected.xml
@@ -0,0 +1 @@
+<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe versao="4.00" Id="NFe41260712345678000190550010000010011100000019"><ide><cUF>41</cUF><cNF>10000001</cNF><natOp>Venda</natOp><mod>55</mod><serie>1</serie><nNF>1001</nNF><dhEmi>2026-07-16T10:00:00-03:00</dhEmi><tpNF>1</tpNF><idDest>1</idDest><cMunFG>4106902</cMunFG><tpImp>1</tpImp><tpEmis>1</tpEmis><cDV>9</cDV><tpAmb>2</tpAmb><finNFe>1</finNFe><indFinal>1</indFinal><indPres>1</indPres><procEmi>0</procEmi><verProc>sowai-auto/1b.1</verProc></ide><emit><CNPJ>12345678000190</CNPJ><xNome>AUTOPECAS THIAGO LTDA</xNome><xFant>Thiago Auto Center</xFant><enderEmit><xLgr>Rua das Autopecas</xLgr><nro>1500</nro><xBairro>Centro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000000</CEP><cPais>1058</cPais><xPais>Brasil</xPais><fone>4133334444</fone></enderEmit><IE>1234567890</IE><CRT>1</CRT></emit><dest><CNPJ>99887766000155</CNPJ><xNome>NF-E EMITIDA EM AMBIENTE DE HOMOLOGACAO - SEM VALOR FISCAL</xNome><enderDest><xLgr>Av Cliente</xLgr><nro>50</nro><xBairro>Bairro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000100</CEP><cPais>1058</cPais><xPais>Brasil</xPais></enderDest><indIEDest>9</indIEDest></dest><det nItem="1"><prod><cProd>PC001</cProd><cEAN>SEM GTIN</cEAN><xProd>Filtro de oleo</xProd><NCM>84212300</NCM><CFOP>5102</CFOP><uCom>UN</uCom><qCom>2</qCom><vUnCom>75.00</vUnCom><vProd>150.00</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>2</qTrib><vUnTrib>75.00</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS></imposto></det><det nItem="2"><prod><cProd>PC002</cProd><cEAN>SEM GTIN</cEAN><xProd>Pastilha de freio</xProd><NCM>87083090</NCM><CFOP>5102</CFOP><uCom>PC</uCom><qCom>4</qCom><vUnCom>45.50</vUnCom><vProd>182.00</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>PC</uTrib><qTrib>4</qTrib><vUnTrib>45.50</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN102><orig>0</orig><CSOSN>102</CSOSN></ICMSSN102></ICMS><PIS><PISNT><CST>08</CST></PISNT></PIS><COFINS><COFINSNT><CST>08</CST></COFINSNT></COFINS></imposto></det><total><ICMSTot><vBC>332.00</vBC><vICMS>0.00</vICMS><vICMSDeson>0.00</vICMSDeson><vFCP>0.00</vFCP><vBCST>0.00</vBCST><vST>0.00</vST><vFCPST>0.00</vFCPST><vFCPSTRet>0.00</vFCPSTRet><vProd>332.00</vProd><vFrete>0.00</vFrete><vSeg>0.00</vSeg><vDesc>0.00</vDesc><vII>0.00</vII><vIPI>0.00</vIPI><vIPIDevol>0.00</vIPIDevol><vPIS>0.00</vPIS><vCOFINS>0.00</vCOFINS><vOutro>0.00</vOutro><vNF>332.00</vNF></ICMSTot></total><transp><modFrete>9</modFrete></transp><pag><detPag><indPag>0</indPag><tPag>01</tPag><vPag>332.00</vPag></detPag></pag></infNFe></NFe>
\ No newline at end of file
diff --git a/src/sowai_fiscal/goldens/caso_padrao_intra.input.json b/src/sowai_fiscal/goldens/caso_padrao_intra.input.json
new file mode 100644
index 0000000..5a724db
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_padrao_intra.input.json
@@ -0,0 +1,180 @@
+{
+  "emitente": {
+    "cnpj": "12345678000190",
+    "razao_social": "AUTOPECAS THIAGO LTDA",
+    "nome_fantasia": "Thiago Auto Center",
+    "ie": "1234567890",
+    "crt": "1",
+    "address_street": "Rua das Autopecas",
+    "address_number": "1500",
+    "address_complement": null,
+    "address_district": "Centro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000000",
+    "address_city_ibge_code": "4106902",
+    "fone": "4133334444"
+  },
+  "destinatario": {
+    "nome": "CLIENTE BALCAO LTDA",
+    "cnpj": "99887766000155",
+    "cpf": null,
+    "indicador_ie": "9",
+    "ie": null,
+    "address_street": "Av Cliente",
+    "address_number": "50",
+    "address_complement": null,
+    "address_district": "Bairro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000100",
+    "address_city_ibge_code": "4106902",
+    "email": null
+  },
+  "itens": [
+    {
+      "codigo": "PC001",
+      "descricao": "Filtro de oleo",
+      "ncm": "84212300",
+      "cfop": "5102",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "2",
+      "valor_unitario": "75.00",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "5102",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "icms",
+            "cst": null,
+            "csosn": "102",
+            "base_calc": "150.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "388a102f-f935-5f9f-ba70-42db4062f171"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "150.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "a4471177-52bf-5b5f-a69d-53b8af65bcef"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "150.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "07604b6a-287d-5314-9fbe-c68495166181"
+          }
+        ]
+      }
+    },
+    {
+      "codigo": "PC002",
+      "descricao": "Pastilha de freio",
+      "ncm": "87083090",
+      "cfop": "5102",
+      "unidade_comercial": "PC",
+      "unidade_tributavel": "PC",
+      "quantidade": "4",
+      "valor_unitario": "45.50",
+      "gtin": null,
+      "cest": null,
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "5102",
+        "cst": null,
+        "csosn": "102",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "icms",
+            "cst": null,
+            "csosn": "102",
+            "base_calc": "182.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "51ff4cd8-651d-5b26-a068-3996791a3af9"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "182.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "893ccc32-9cb6-5dbc-b5e3-427461de4cb7"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "08",
+            "csosn": null,
+            "base_calc": "182.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "9c2c1b35-3f67-56bb-a109-e78ab1a6f7f1"
+          }
+        ]
+      }
+    }
+  ],
+  "pagamento": {
+    "tpag": "01",
+    "valor": "332.00",
+    "indpag": "0"
+  },
+  "ambiente": "homologacao",
+  "chave_acesso": "41260712345678000190550010000010011100000019",
+  "numero": 1001,
+  "serie": 1,
+  "cnf": "10000001",
+  "dh_emi": "2026-07-16T10:00:00-03:00",
+  "uf_destino_tipo": "interna"
+}
diff --git a/src/sowai_fiscal/goldens/caso_st_intra.expected.xml b/src/sowai_fiscal/goldens/caso_st_intra.expected.xml
new file mode 100644
index 0000000..e190465
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_st_intra.expected.xml
@@ -0,0 +1 @@
+<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe versao="4.00" Id="NFe41260712345678000190550010000010031100000030"><ide><cUF>41</cUF><cNF>10000003</cNF><natOp>Venda</natOp><mod>55</mod><serie>1</serie><nNF>1003</nNF><dhEmi>2026-07-16T10:10:00-03:00</dhEmi><tpNF>1</tpNF><idDest>1</idDest><cMunFG>4106902</cMunFG><tpImp>1</tpImp><tpEmis>1</tpEmis><cDV>0</cDV><tpAmb>2</tpAmb><finNFe>1</finNFe><indFinal>1</indFinal><indPres>1</indPres><procEmi>0</procEmi><verProc>sowai-auto/1b.1</verProc></ide><emit><CNPJ>12345678000190</CNPJ><xNome>AUTOPECAS THIAGO LTDA</xNome><xFant>Thiago Auto Center</xFant><enderEmit><xLgr>Rua das Autopecas</xLgr><nro>1500</nro><xBairro>Centro</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000000</CEP><cPais>1058</cPais><xPais>Brasil</xPais><fone>4133334444</fone></enderEmit><IE>1234567890</IE><CRT>1</CRT></emit><dest><CPF>12345678909</CPF><xNome>NF-E EMITIDA EM AMBIENTE DE HOMOLOGACAO - SEM VALOR FISCAL</xNome><enderDest><xLgr>Rua Oficina</xLgr><nro>22</nro><xBairro>Industrial</xBairro><cMun>4106902</cMun><xMun>Curitiba</xMun><UF>PR</UF><CEP>80000200</CEP><cPais>1058</cPais><xPais>Brasil</xPais></enderDest><indIEDest>9</indIEDest></dest><det nItem="1"><prod><cProd>OL500</cProd><cEAN>SEM GTIN</cEAN><xProd>Oleo lubrificante 15W40 1L</xProd><NCM>27101259</NCM><CEST>0600100</CEST><CFOP>5405</CFOP><uCom>UN</uCom><qCom>1</qCom><vUnCom>100.00</vUnCom><vProd>100.00</vProd><cEANTrib>SEM GTIN</cEANTrib><uTrib>UN</uTrib><qTrib>1</qTrib><vUnTrib>100.00</vUnTrib><indTot>1</indTot></prod><imposto><ICMS><ICMSSN500><orig>0</orig><CSOSN>500</CSOSN><vBCSTRet>140.00</vBCSTRet><pST>18.0000</pST><vICMSSTRet>13.20</vICMSSTRet></ICMSSN500></ICMS><PIS><PISNT><CST>04</CST></PISNT></PIS><COFINS><COFINSNT><CST>04</CST></COFINSNT></COFINS></imposto></det><total><ICMSTot><vBC>0.00</vBC><vICMS>0.00</vICMS><vICMSDeson>0.00</vICMSDeson><vFCP>0.00</vFCP><vBCST>140.00</vBCST><vST>13.20</vST><vFCPST>0.00</vFCPST><vFCPSTRet>0.00</vFCPSTRet><vProd>100.00</vProd><vFrete>0.00</vFrete><vSeg>0.00</vSeg><vDesc>0.00</vDesc><vII>0.00</vII><vIPI>0.00</vIPI><vIPIDevol>0.00</vIPIDevol><vPIS>0.00</vPIS><vCOFINS>0.00</vCOFINS><vOutro>0.00</vOutro><vNF>100.00</vNF></ICMSTot></total><transp><modFrete>9</modFrete></transp><pag><detPag><indPag>0</indPag><tPag>01</tPag><vPag>100.00</vPag></detPag></pag></infNFe></NFe>
\ No newline at end of file
diff --git a/src/sowai_fiscal/goldens/caso_st_intra.input.json b/src/sowai_fiscal/goldens/caso_st_intra.input.json
new file mode 100644
index 0000000..badeddb
--- /dev/null
+++ b/src/sowai_fiscal/goldens/caso_st_intra.input.json
@@ -0,0 +1,114 @@
+{
+  "emitente": {
+    "cnpj": "12345678000190",
+    "razao_social": "AUTOPECAS THIAGO LTDA",
+    "nome_fantasia": "Thiago Auto Center",
+    "ie": "1234567890",
+    "crt": "1",
+    "address_street": "Rua das Autopecas",
+    "address_number": "1500",
+    "address_complement": null,
+    "address_district": "Centro",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000000",
+    "address_city_ibge_code": "4106902",
+    "fone": "4133334444"
+  },
+  "destinatario": {
+    "nome": "CLIENTE BALCAO LTDA",
+    "cnpj": null,
+    "cpf": "12345678909",
+    "indicador_ie": "9",
+    "ie": null,
+    "address_street": "Rua Oficina",
+    "address_number": "22",
+    "address_complement": null,
+    "address_district": "Industrial",
+    "address_city": "Curitiba",
+    "address_state": "PR",
+    "address_zip": "80000200",
+    "address_city_ibge_code": "4106902",
+    "email": null
+  },
+  "itens": [
+    {
+      "codigo": "OL500",
+      "descricao": "Oleo lubrificante 15W40 1L",
+      "ncm": "27101259",
+      "cfop": "5405",
+      "unidade_comercial": "UN",
+      "unidade_tributavel": "UN",
+      "quantidade": "1",
+      "valor_unitario": "100.00",
+      "gtin": null,
+      "cest": "0600100",
+      "peso_liquido_kg": null,
+      "peso_bruto_kg": null,
+      "fiscal_result": {
+        "cfop": "5405",
+        "cst": null,
+        "csosn": "500",
+        "origem": "0",
+        "consumidor_final": true,
+        "indicador_ie": "9",
+        "tributos": [
+          {
+            "tax_domain": "icmsst",
+            "cst": null,
+            "csosn": "500",
+            "base_calc": "140.00",
+            "base_calc_percent": "100",
+            "aliquota": "18",
+            "valor": "13.20",
+            "mva": "40",
+            "aliquota_st": "18",
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "dd66fbca-c7d0-5d3e-a231-1a2afd3c1c74"
+          },
+          {
+            "tax_domain": "pis",
+            "cst": "04",
+            "csosn": null,
+            "base_calc": "100.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "ac7c5793-b5a8-58b5-b060-af95db499e78"
+          },
+          {
+            "tax_domain": "cofins",
+            "cst": "04",
+            "csosn": null,
+            "base_calc": "100.00",
+            "base_calc_percent": "100",
+            "aliquota": "0",
+            "valor": "0.00",
+            "mva": null,
+            "aliquota_st": null,
+            "fcp_percent": null,
+            "codigo_beneficio": null,
+            "rule_id": "5b0b52d8-50e1-57b9-a473-0911572b040b"
+          }
+        ]
+      }
+    }
+  ],
+  "pagamento": {
+    "tpag": "01",
+    "valor": "100.00",
+    "indpag": "0"
+  },
+  "ambiente": "homologacao",
+  "chave_acesso": "41260712345678000190550010000010031100000030",
+  "numero": 1003,
+  "serie": 1,
+  "cnf": "10000003",
+  "dh_emi": "2026-07-16T10:10:00-03:00",
+  "uf_destino_tipo": "interna"
+}
diff --git a/tests/test_goldens.py b/tests/test_goldens.py
new file mode 100644
index 0000000..31d9d0f
--- /dev/null
+++ b/tests/test_goldens.py
@@ -0,0 +1,56 @@
+"""Corpus golden: para cada `caso_*.input.json` em `sowai_fiscal.goldens`,
+carrega o `DadosEmissao`, monta+serializa o XML pré-assinatura e compara
+BYTE A BYTE com o `caso_*.expected.xml` irmão. Estes dados são PACOTE
+(`importlib.resources`), não fixtures de `tests/` -- o produto consumidor
+(auto) e o futuro serviço leem os MESMOS arquivos da lib instalada.
+
+Regenerar os `.expected.xml` (nunca à mão) com `scripts/gen_goldens.py` --
+só quando uma NT mudar o leiaute DE PROPÓSITO."""
+import importlib.resources
+
+import pytest
+
+from sowai_fiscal.golden_helpers import dados_from_json, serialize_infnfe
+
+_GOLDENS = importlib.resources.files("sowai_fiscal") / "goldens"
+
+
+def _casos() -> list[str]:
+    with importlib.resources.as_file(_GOLDENS) as goldens_dir:
+        return sorted(
+            p.name.removesuffix(".input.json")
+            for p in goldens_dir.glob("caso_*.input.json")
+        )
+
+
+_CASOS = _casos()
+
+
+def test_at_least_six_golden_cases_exist():
+    assert len(_CASOS) >= 6, f"esperado >=6 casos golden, achei {len(_CASOS)}: {_CASOS}"
+
+
+@pytest.mark.parametrize("caso", _CASOS)
+def test_golden_case_matches_expected_xml_byte_a_byte(caso):
+    with importlib.resources.as_file(_GOLDENS) as goldens_dir:
+        input_path = goldens_dir / f"{caso}.input.json"
+        expected_path = goldens_dir / f"{caso}.expected.xml"
+
+        dados = dados_from_json(input_path)
+        actual = serialize_infnfe(dados)
+        expected = expected_path.read_bytes()
+
+    if actual != expected:
+        # Diff legível: aponta o primeiro byte divergente em vez de despejar
+        # os dois XMLs inteiros no assert.
+        first_diff = next(
+            (i for i, (a, e) in enumerate(zip(actual, expected)) if a != e),
+            min(len(actual), len(expected)),
+        )
+        window = 60
+        start = max(0, first_diff - window)
+        assert actual == expected, (
+            f"caso {caso!r} diverge no byte {first_diff}:\n"
+            f"  actual:   ...{actual[start:first_diff + window]!r}...\n"
+            f"  expected: ...{expected[start:first_diff + window]!r}..."
+        )