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XSD Ministerstwo Finansów (Poland) · FA (3), 1-0E

KSeF FA(3)

Polish structured invoice (e-Faktura)

The structured invoice of the Polish National e-Invoicing System (KSeF), in the FA(3) version required from February 2026.

Validate with this schema Try it with the example

About

Poland makes invoicing through KSeF mandatory in 2026. An invoice is an XML file in the FA structure; KSeF rejects a file that does not match the schema and assigns a KSeF number to one that does.

FA(3) replaced FA(2). The schema imports the Ministry's shared type and code list schemas (StrukturyDanych, ElementarneTypyDanych, KodyKrajow), included here.

E-invoicing in Poland: the rules in short and how to check an invoice →

Good to know

  • The schema checks structure and data types. KSeF also checks the sender's permissions, NIP numbers and duplicates, which no schema covers.
  • The imports of the shared type schemas point at local copies; nothing else is changed.
  • The example is the sample invoice from the Ministry of Finance ksef-pdf-generator project (MIT licence).

Files

4 files · 261.1 KB

The validator loads all of these with their folder structure, so includes and imports resolve as published.

Example document

invoice.xml · 12.9 KB · valid against this schema

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In CI and from code

The same schema by its name, ksef-fa-3, through the API.

npx @xmlvalid/cli validate "**/*.xml" --schema ksef-fa-3
- uses: xmlvalid/validate-action@v1
  with:
    files: "**/*.xml"
    schema: ksef-fa-3
    api-key: ${{ secrets.XMLVALID_API_KEY }}
curl https://xmlvalid.com/api/v1/validations \
  -H "Authorization: Bearer $XMLVALID_API_KEY" \
  -F document={{ $schema->example ?? 'document.xml' }} -F schema=ksef-fa-3

Free accounts get 100 API validations a month. On Pro, a URL monitor can check a published document against this schema every hour and email you when it breaks. More CI setups