Correcting JPK After the Deadline in 2026 — Consequences and Procedure

What is JPK_V7M and why corrections matter

JPK_V7M is a mandatory file submitted monthly by active VAT taxpayers who settle VAT on a monthly basis. Quarterly taxpayers submit JPK_V7K instead. Since 1 October 2020, this file has replaced the separate VAT-7 declarations and JPK_VAT files, merging them into a single structure transmitted electronically to the Ministerstwo Finansów (Ministry of Finance).

Every error in JPK_V7M — even a seemingly minor one — matters, because the data from the file feeds directly into the STIR analytical system (System Teleinformatyczny Izby Rozliczeniowej — the Clearing House IT System) and the algorithms of KAS (Krajowa Administracja Skarbowa — the National Revenue Administration). Irregularities can trigger an automatic request for correction and, in extreme cases, a tax audit or fiscal-criminal proceedings.

Most common errors in JPK_V7M

Before we discuss the correction procedure, it is worth knowing the most frequent mistakes:

• Omitting a sales or purchase invoice — e.g. an invoice from the end of the month booked only in the following period.
• Incorrect counterparty NIP (tax identification number) — a typo in the identification number, causing a discrepancy in the VIES system or the Wykaz Podatników VAT (Biała lista — the VAT Taxpayers' Whitelist).
• Wrong GTU code (goods and services group code) — assigning a product or service to the incorrect group (GTU_01–GTU_13), e.g. tagging a consulting service incorrectly or omitting the designation entirely.
• Errors in procedure designations — omitting codes such as MPP (mechanizm podzielonej płatności — split payment mechanism), TP (related-party transactions) or SW (distance selling).
• Incorrect VAT rate — applying 23% instead of 8% or vice versa.
• Arithmetic errors — incorrect totalling of net/VAT amounts, discrepancies between the records section and the declaration section.
• Duplicate invoices — entering the same invoice twice, overstating input VAT.

Who is required to file a correction

The obligation to file a JPK_V7M correction applies to every active VAT taxpayer who has identified an error in an already submitted file. Under Article 81 § 1 of the Ordynacja podatkowa (Tax Ordinance Act of 29 August 1997, Journal of Laws 2025, item 145, consolidated text), a taxpayer has the right to correct a previously filed declaration — and where the tax liability has been understated, this is simultaneously an obligation under Article 81b of the Tax Ordinance.

The correction obligation applies to:

• sole traders — JDG (jednoosobowa działalność gospodarcza — sole proprietorship),
• Sp. z o.o. (limited liability companies), joint-stock companies and sp. komandytowa (limited partnerships),
• civil partnerships and sp. jawna (general partnerships),
• foreign entities registered as VAT taxpayers in Poland.

Correction before a summons — the golden rule

A correction filed on your own initiative before a summons from the tax office avoids fiscal-criminal penalties. There is no fixed deadline, but the sooner the better. Any outstanding VAT must be paid with late-payment interest (8% per annum in 2026), calculated from the original payment deadline to the date of payment.

The legal basis is Article 81 § 1 of the Tax Ordinance: "Unless separate provisions provide otherwise, taxpayers, tax remitters and tax collectors may correct a previously filed declaration." The key point is that a voluntary correction — made before any contact from the tax authority — is treated as a fully lawful remedial action.

Practical example — voluntary correction

"Kowalski IT" Sp. z o.o. filed its JPK_V7M for January 2026 on time (25 February 2026), declaring output VAT of 18,400 PLN. In March 2026, the accountant discovered a missing sales invoice for a net amount of 12,000 PLN + VAT 2,760 PLN (23% rate).

Item	Before correction	After correction
Output VAT	18,400 PLN	21,160 PLN
Input VAT	11,200 PLN	11,200 PLN
VAT payable	7,200 PLN	9,960 PLN
Shortfall	—	2,760 PLN

The company must pay the additional 2,760 PLN plus late-payment interest. Interest is calculated from 26 February (the day after the payment deadline for January) to the date of payment, e.g. until 20 March 2026 = 22 days:

Interest = 2,760 PLN × 8% × 22/365 = 13.31 PLN

Total cost of correcting the error: 2,773.31 PLN — with no fiscal-criminal penalties whatsoever.

Correction after a summons — czynny żal (voluntary disclosure)

If the tax office has already issued a summons, you file the correction together with a "czynny żal" (a voluntary disclosure — a written statement acknowledging the error and its rectification) under Article 16 § 1 of the Kodeks karny skarbowy (Fiscal Penal Code, hereinafter KKS). This procedure avoids penalties under KKS Articles 16–17, provided you submit the voluntary disclosure before fiscal-criminal proceedings are initiated. Important: czynny żal may only be used once for the same error.

Conditions for an effective czynny żal (Article 16 § 1 KKS):

1. The notification must be filed before proceedings for a fiscal offence or fiscal misdemeanour are initiated.
2. The taxpayer must disclose the material circumstances of the act, including any persons involved.
3. The taxpayer must pay in full the outstanding public-law liability (back tax + interest) within the deadline set by the authority or without delay.

Note: A czynny żal will not be effective if the tax authority has already documented the commission of a fiscal offence or misdemeanour, or if the taxpayer was the organiser, leader or initiator of the action (Article 16 § 6 KKS).

Practical example — czynny żal

Ms Anna runs a JDG (marketing services). On 10 March 2026, she received a summons from the tax office regarding discrepancies in her JPK_V7M for December 2025 — the office noticed two missing purchase invoices with the MPP designation. Ms Anna:

1. Prepared a corrected JPK_V7M for December 2025, adding the missing invoices.
2. Filed a czynny żal in writing addressed to the head of the tax office.
3. Paid any resulting tax difference together with interest.

Since fiscal-criminal proceedings had not yet been initiated, the czynny żal was accepted as effective — Ms Anna avoided a fine.

Step by step — how to file a JPK_V7M correction

1. Identify the error — review your sales and purchase registers, compare them with source invoices, and verify GTU codes and procedure designations.
2. Prepare the correction in your accounting system — in your accounting software (e.g. Optima, Symfonia, wFirma, Księgowość 365) tick the "Correction" box and enter the correct data. The system will automatically generate an XML file with the header CelZlozenia = 2 (correction).
3. Validate the file — before sending, check the file with the MF (Ministry of Finance) validator (available at podatki.gov.pl) or the built-in validator in your accounting software.
4. Submit via e-Deklaracje or API — send the correction electronically. Keep the UPO (Urzędowe Poświadczenie Odbioru — Official Acknowledgement of Receipt) — this is your proof of filing.
5. Pay the outstanding tax with interest — if the correction increases your liability, transfer the difference to your mikrorachunek podatkowy (individual tax account) with interest calculated using the MF calculator.
6. File a czynny żal if applicable — if the correction follows contact from the tax office, attach a voluntary disclosure statement under Article 16 KKS.

2026 deadlines — key dates for JPK corrections

Settlement period	JPK_V7M filing deadline	Statute of limitations for correction
January 2026	25 February 2026	31 December 2031
February 2026	25 March 2026	31 December 2031
March 2026	25 April 2026	31 December 2031
April 2026	27 May 2026 *	31 December 2031
May 2026	25 June 2026	31 December 2031
June 2026	27 July 2026 *	31 December 2031

* Deadline shifted because the 25th falls on a Saturday or Sunday (Article 12 § 5 of the Tax Ordinance).

The right to file a correction expires together with the tax liability — i.e. after 5 years, counting from the end of the calendar year in which the tax payment deadline fell (Article 70 § 1 of the Tax Ordinance). For VAT liabilities for 2026, the statute of limitations expires on 31 December 2031.

Financial penalties — the full picture

Correction after a summons: an additional liability of 30% of the VAT difference if you understated the tax. Failure to correct despite a summons: fines up to 56,000 PLN plus an additional liability of 100% of the difference. The bottom line: a prompt and correct correction with interest is always cheaper than penalties for non-compliance.

Detailed penalty rates (Articles 112b and 112c of the VAT Act)

Situation	Additional VAT liability	KKS penalties
Voluntary correction (before summons)	None	None
Correction after summons but before audit	15% of the understated amount *	None (with an effective czynny żal)
Correction during a tax audit	20% of the understated amount	Fine up to 56,000 PLN (misdemeanour) or up to 33.6 million PLN (offence)
No correction — determined by the authority	30% of the understated amount	Fine + possible fiscal-criminal proceedings
VAT fraud (fictitious invoices, carousel schemes)	100% of the overstated amount	Imprisonment up to 10 years (Article 76 KKS)

* The 15% rate applies when the taxpayer files the correction within 14 days of receiving the summons and pays the arrears with interest.

Numerical example — cost comparison

Assume an understatement of output VAT by 10,000 PLN for March 2026:

Scenario	Outstanding VAT	Interest (30 days)	Additional penalty	Total
Voluntary correction	10,000 PLN	66 PLN	0 PLN	10,066 PLN
Correction after summons (14 days)	10,000 PLN	66 PLN	1,500 PLN	11,566 PLN
Correction during audit	10,000 PLN	66 PLN	2,000 PLN	12,066 PLN
Determined by the authority (no correction)	10,000 PLN	66 PLN	3,000 PLN + fine	13,066 PLN+

Conclusion: a voluntary correction costs 15–30% less than a correction forced by a summons.

When a JPK correction is not possible

The right to file a correction is temporarily restricted or excluded in the following situations:

• During a tax or customs-fiscal audit — for the duration of the audit, the right to correct the areas covered by the audit is suspended (Article 81b § 1(1) of the Tax Ordinance). A correction may only be filed after the audit is concluded.
• After the statute of limitations has expired — after 5 years from the end of the year in which the payment deadline fell (Article 70 § 1 of the Tax Ordinance).
• After a determination decision has been issued — in respect of matters covered by a final decision of the authority, unless the correction concerns a different item than that covered by the decision.

Most common mistakes when filing a correction

1. Correcting only the records section without the declaration section — JPK_V7M consists of two parts. If the error affects the tax amount, both parts must be corrected.
2. Failing to pay the arrears with interest — the correction alone is not sufficient. If you do not pay the outstanding VAT, the authority will charge interest ex officio and may initiate enforcement proceedings.
3. Sending a file with an invalid XML structure — the file will be rejected by the system. Always validate before sending.
4. Filing a czynny żal after proceedings have been initiated — it is ineffective and does not protect against penalties.
5. Correcting only one period for a recurring error — if the mistake spans multiple months (e.g. an incorrect GTU code used for an entire quarter), the correction must cover all affected periods.
6. Not including an explanation with the correction — although it has not been formally required since 2016, attaching a written explanation speeds up processing and builds credibility.

JPK correction and KSeF in 2026

Since 1 February 2026, KSeF (Krajowy System e-Faktur — the National e-Invoicing System) has been mandatory for active VAT taxpayers with annual turnover exceeding 200 million PLN, and since 1 April 2026 — for all other active VAT taxpayers. The implementation of KSeF affects the JPK correction procedure as follows:

• Invoices in KSeF have a unique identification number — making it easier to identify missing or duplicated documents.
• Automatic data reconciliation — the MF system compares KSeF data with JPK_V7M data. Discrepancies trigger automatic notifications.
• Shorter window for error detection — because KSeF enables real-time monitoring, tax offices identify irregularities more quickly. In practice, this means the window for a voluntary correction (without a summons) is shorter.

Recommendation: In the KSeF era, it is advisable to reconcile the data between the KSeF register and JPK_V7M every month before filing, in order to minimise the risk of needing a correction.

FAQ — frequently asked questions

How many JPK_V7M corrections can be filed for a single period?

There is no statutory limit on the number of corrections. Multiple corrections for the same period may be filed — each subsequent one replaces the previous. In practice, however, excessively frequent corrections may attract the attention of the tax authority.

Does a JPK_V7M correction require a qualified electronic signature?

Yes — the correction must be authorised in the same way as the original file: with a qualified electronic signature, Profil Zaufany (ePUAP — trusted profile), or authorisation data (the income amount from the previous year's tax return).

What if the correction reduces the VAT payable (overpayment)?

If after the correction it turns out that you overpaid VAT, you may apply for a refund of the overpayment (Articles 72–77 of the Tax Ordinance) or credit it against future liabilities. The refund is issued within 60 days of filing the correction (Article 87(2) of the VAT Act), unless the authority extends the deadline for verification purposes.

Do I need to inform my counterparty about the correction?

There is no legal obligation to do so, unless the correction results from issuing a corrective invoice — in which case the counterparty receives it automatically (via KSeF) or by traditional means. If the JPK correction concerns only a technical error (e.g. a GTU code), you do not need to notify the counterparty.

What is the late-payment interest rate in 2026?

The late-payment interest rate on tax arrears in 2026 is 8% per annum (announcement by the Minister of Finance). A reduced rate of 4% (50% of the standard rate) applies when the taxpayer files a voluntary correction and pays the arrears within 7 days of filing the correction (Article 56a of the Tax Ordinance).

Summary

Aim to correct every JPK error in the same or the following month. A czynny żal combined with a correction effectively protects against penalties — but only if filed before the tax office initiates proceedings. Keep these key principles in mind:

• Voluntary correction = no penalties — you pay only the outstanding tax with interest (potentially reduced to 4%).
• Correction after summons + czynny żal = protection from KKS penalties — but additional liabilities of 15–30% may apply.
• No correction = the most expensive scenario — penalty up to 100% of the understatement, fine up to 56,000 PLN (misdemeanour) or imprisonment (offence).
• Verify data before filing — reconcile registers with KSeF, validate the XML file, and check GTU codes and procedure designations.
• Mind the statute of limitations — corrections for 2026 may be filed until 31 December 2031.

If in doubt, consult a tax adviser — the cost of a consultation is far lower than the potential penalties for an incorrect or late VAT settlement.