Errors in JPK_VAT can cost an entrepreneur thousands of złoty in penalties. Find out which mistakes occur most frequently and how to effectively protect yourself against them.
JPK_VAT is one of the key obligations of every active VAT taxpayer in Poland. The file combines the VAT register with the tax return, which means that every mistake can have serious consequences – from summons issued by the urząd skarbowy to severe financial penalties. In this article we explain what errors entrepreneurs make most often, what consequences they may face, and how to correctly prepare a JPK_VAT file so you can sleep soundly.
JPK_VAT (Jednolity Plik Kontrolny for VAT) is an electronic XML file that active VAT taxpayers submit to the urząd skarbowy every month. It consists of two parts: • the records section – detailed data on issued and received invoices, • the declaration section – the equivalent of the former VAT-7 or VAT-7K return. The obligation to file JPK_VAT applies to all businesses registered as active VAT taxpayers, regardless of their legal form – sole traders (JDG), spółki z o.o., and partnerships. The filing deadline is the 25th day of the month following the reporting period. It is worth noting that from 2026 the tax reporting environment is being supplemented by KSeF, which further increases data consistency requirements.
Errors on the sales side are one of the most frequent causes of corrections and summons from the tax authority. The most common include: 1. Missing or incorrect GTU codes – goods and services covered by GTU codes 01–13 must be properly labelled. Omitting a code or using the wrong one results in discrepancies in the file. 2. Incorrect procedure codes – for example, failing to mark TP (transactions with related parties) or SW (mail-order sales). 3. Wrong tax point date – recording an invoice in the wrong reporting period disrupts the consistency between the register and the declaration. 4. Errors in the buyer's NIP – an incorrect NIP prevents the tax authorities from performing cross-checks against the counterparty's data. Each of these errors may trigger an audit procedure or result in a summons to correct the file.
The purchase side of JPK_VAT is equally risky. Tax authorities are increasingly effective at detecting irregularities through automated algorithms that cross-reference data from sellers and buyers. The most common errors: • Deducting VAT from an invoice that does not entitle the taxpayer to deduction – for example, invoices issued by a VAT-exempt taxpayer or relating to mixed-purpose costs without applying the pro-rata method. • Recording a purchase invoice earlier than the date on which it was received. • Failure to make adjustments for unsettled liabilities (bad debt relief on the buyer's side). • Duplicate invoices – the same invoice is sometimes posted twice, overstating the amount of deducted tax. Regular verification of the VAT registers before submitting the file eliminates most of these issues.
The consequences of irregularities in JPK_VAT can be severe. The provisions of the Kodeks karny skarbowy provide for several scenarios: 1. Fines for failing to submit or submitting the file late – up to 5 times the minimum wage in penalty-order proceedings. 2. A financial penalty of PLN 500 per error in the register – the urząd skarbowy may impose it after issuing a summons to correct, if the taxpayer fails to remedy the deficiencies within the set deadline. 3. Fiscal criminal liability – concealing data or deliberately falsifying records may result in fines and, in extreme cases, imprisonment. Most importantly: if an error is discovered, it is better to file a corrected JPK_VAT on your own initiative before the tax authority does so. A voluntary disclosure (czynny żal) or a correction filed before proceedings are initiated significantly reduces the risk of sanctions.
Avoiding errors starts with a well-organised bookkeeping process. A few practical tips: • Verify data on an ongoing basis – do not leave document gathering to the last days of the month. • Check counterparties' NIP numbers in the VAT Taxpayer Register (Biała Lista) before recording an invoice in the register. • Use software that automatically validates the file before submission – JPK tools generate error reports that should be thoroughly analysed. • VAT reconciliation – compare the values from the registers with the accounting account balances before submitting the file. • Keep up with regulatory changes – procedures, GTU codes and JPK_VAT structural requirements have changed several times in recent years and may continue to evolve. If you run your business independently and have no experience with JPK, consider entrusting this responsibility to a professional accounting firm.
Correcting a JPK_VAT file is possible and in many cases necessary. A correction should be filed when: 1. You discover an error in the sales or purchase register after the file has been submitted. 2. You receive a correcting invoice from a counterparty or issue one yourself. 3. You are summoned by the urząd skarbowy to explain discrepancies. The correction is submitted in the same electronic form as the original file – via the Ministry of Finance gateway. It is important that the corrected file includes all line items for the reporting period, not only the amended records (this depends on the version of the JPK structure). We recommend attaching a written explanation of the correction, especially when it changes the amount of the tax liability or overpayment. A prompt and accurate correction can protect you from the PLN 500 per-error penalty.
JPK_VAT requires precision, up-to-date knowledge and systematic data verification. Errors – even minor ones – can generate costs and consume time in dealings with the urząd skarbowy. If you want to be certain that your company files JPK_VAT flawlessly and in compliance with current regulations, contact the Danexis accounting firm. Call us on +48 780 760 666, write to kontakt@danexis.pl, or visit us at ul. Braniborska 74/20 in Wrocław. We will be happy to discuss your needs and propose an appropriate form of cooperation.