Document format and locale facts for Poland

Why these defaults?

The country code comes from ISO 3166. Unicode CLDR supplies presentation-oriented locale, currency, paper, date, language, calendar, numbering, and direction metadata. Defaults reduce setup time; they do not decide what a valid document must contain.

Recorded official or regional-official language tags: pl, de, csb, lt.

Selected national claims reviewed

Document vocabulary and checks

Core Polish VAT invoice and correction particulars, NIP identity, ordinary and KSeF retention periods, and the current phased KSeF scope and exceptions are reviewed from Ministry of Finance services. Authentication, FA(3) generation, KSeF submission, special schemes and transaction-specific VAT treatment remain implementation-specific checks.

Evidence snapshot: 7 official sources · last reviewed 2026-07-19. This is scoped guidance, not a jurisdiction-wide compliance certification.

Tax labels: VAT. Business identifier labels: Numer Identyfikacji Podatkowej (NIP).

• Required when applicable: A Polish VAT invoice ordinarily identifies the issue and supply dates, invoice number, seller and buyer names, addresses and applicable NIP identifiers, the goods or services, quantity, VAT-exclusive unit price, reductions, taxable value by rate, VAT rates and amounts, and total due. Special transactions and simplified documents have adjusted fields.Evidence PL_MINISTRY_INVOICE_RULES · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Guidance: A Polish correcting invoice identifies itself as a correction, has its own number and issue date, identifies the corrected invoice and parties, describes the reason and corrected goods or services, and states the applicable correction or corrected content. KSeF-specific correction timing applies when the correction is structured.Evidence PL_BIZNES_CORRECTING_INVOICE · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Required when applicable: Keep tax documents, including invoices and tax books, until the relevant tax liability limitation period expires-normally five years from the end of the calendar year in which payment was due, subject to events that suspend or interrupt that period. Structured KSeF invoices are retained in KSeF for ten years from the end of their issue year.Evidence PL_MINISTRY_TAX_RECORD_RETENTION, PL_KSEF_RETENTION · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Guidance: Poland's structured eInvoices are issued and received through KSeF and assigned a KSeF identifier. Mandatory issuance began on 1 February 2026 for taxpayers above the stated 2024 sales threshold and on 1 April 2026 for other taxpayers, with a temporary monthly PLN 10,000 exception through 2026 and defined person, transaction and document exclusions. This generator creates neither FA(3) XML nor an authenticated KSeF submission.Evidence PL_KSEF_MANDATORY_SCOPE, PL_KSEF_FA3_STRUCTURE · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only

Identifier format guidance: See the relevant authority.