Poland JPK validator

Five pinned versions, two separate packages

Verified with MF / KAS on 6 November 2026: V7M(3) and V7K(3) apply from February 2026; V7M(2) and V7K(2) cover January 2022 through January 2026. Corrections follow the reporting period, not the date you run this tool. V7K evidence is monthly; a quarterly declaration belongs to the final month of the matching quarter.

JPK_FA(4) is a separate invoice-data export. It is not KSeF FA(3), and a KSeF invoice cannot replace a JPK return. This tool does not cover other JPK types.

Read each layer separately

• XML: existing hardened engine after bounded preflight; 100,000 elements, depth 80, field text 64 KB.
• XSD: not executed until an authorised complete local schema package is supplied. A test subset proves only that subset; official-root hash identity is recorded separately.
• Independent V7 rules: NIP checksum, period/version, quarter, purpose 1/2, present GTU/procedure field membership and marker value, row counts, purchase total, sales tax including FP exclusion and version (3) K_360 subtraction. No judgement about which GTU or procedure legally applies.
• Independent FA rules: purpose 1, date interval, correction reference, invoice/line counts, control sums of P_15 and P_11, and line-to-invoice links. Ordinary invoice net/gross and quantity × price checks are review warnings; special corrections, advances, foreign currency and historical VAT rates need separate interpretation.

No proof of correct fiscal qualification, VAT liability, taxpayer registration, successful submission or UPO. Full declaration formulas and cross-month quarter reconciliation are unchecked. Unknown profiles never receive a complete green result.

Fictional examples with known outcomes

The primary action runs the selected package sample. These independently authored rule-only files are not filing templates and have no established official XSD validity. Each package has a passing rule demo, a control-total error and a missing KodFormularza XSD-error fixture. The latter is executed against our own MIT test subset, clearly distinct from MF.

All five packages: expected codes / locations · V7M(3) demo · V7K(3) demo · FA(4) demo · Independent test XSD · not MF

Repair the export at the right layer

JPK period / version mismatch · JPK control totals and FP rows

Primary sources and notices

MF / KAS · Struktury JPK · JPK_V7M(3) XSD · JPK_V7K(3) XSD · JPK_FA(4) XSD · MF reuse conditions · Artifact and engine notices

MF reuse conditions require source, production/acquisition time, changes and known author. The gov.pl text footer is not treated as a licence for each schema/import. Unresolved imported type/code-list rights remain a separate open decision; no protected rule pack, Schematron or new engine/plugin is shipped.