JPK CIT – when does it apply and who is affected?

JPK CIT comes into force for the largest companies as early as 2025, and in 2026 it will cover the majority of taxpayers keeping full accounting records. In this guide, we explain exactly what must be reported, how to prepare your system and chart of accounts, and how to avoid errors and sanctions.

 

TABLE OF CONTENTS

1. What is JPK CIT? Definition and purpose of reporting
2. Why JPK CIT was introduced
3. Changes in 2026
4. Scope of data in JPK CIT
5. Who is required to submit JPK CIT
6. How to prepare and submit JPK CIT step by step
7. Most common JPK CIT errors
8. Tax audits and JPK CIT
9. Penalties and sanctions
10. Benefits of implementing JPK CIT
11. Summary
12. FAQ

 

What is JPK CIT? Definition and purpose of reporting

As of 1 January 2025, the largest corporate income tax (CIT) taxpayers are required to keep their accounting books using computer software. After the end of the tax year, the accounting books must be submitted to the competent head of the tax office—by the deadline for filing the annual tax return—in electronic form corresponding to the logical structure specified by the Minister of Finance.

This new form of reporting is referred to as JPK_CIT and consists of two main structures:

• JPK_KR_PD – data from accounting books and information concerning corporate income tax settlements,
• JPK_ST_KR – records of fixed assets and intangible assets (intangible assets and legal rights).

The obligation to report JPK CIT is introduced by the Regulation of the Minister of Finance of 16 August 2024 on additional data that must be included in accounting books submitted to tax authorities.

 

Why JPK CIT was introduced

The introduction of JPK CIT is part of a broader process of digitising tax settlements in Poland. The aim of the new regulations is to increase financial transparency of enterprises, improve the efficiency of tax administration, and reduce the number of errors and abuses in tax settlements.

 

Changes in 2026

The year 2025 is only the first stage of implementing JPK CIT.
As of 1 January 2026, reporting will be extended to the majority of CIT and PIT taxpayers keeping accounting books—also those who do not currently submit JPK_V7 files for VAT purposes.

The most important changes from 2026 include:

• reporting of contractor data and KSeF numbers,
• inclusion of differences between accounting profit and taxable profit (permanent and temporary differences),
• introduction of the mandatory JPK_ST_KR structure for fixed asset records,
• extension of reporting to taxpayers applying IFRS/IAS.

Only taxpayers exempt from CIT (with the exception of family foundations) and entities keeping simplified revenue and expense records will be exempt from the reporting obligation.

 

Scope of data in JPK CIT

The JPK CIT structure covers a broad range of data intended to ensure full consistency between financial settlements and tax records.

The file will include, among others: identification data of contractors (tax identification number – NIP), invoice numbers assigned in KSeF, tags identifying accounting accounts in accordance with the Ministry of Finance dictionary, as well as information on fixed assets and intangible assets.

Additionally, the report includes differences between accounting and taxable profit and the amount of taxable income—including for taxpayers taxed under the lump-sum regime on company income (Estonian CIT).

 

Who is required to submit JPK CIT

The reporting obligation is introduced in stages:

• from 1 January 2025 – the largest CIT taxpayers (revenues exceeding EUR 50 million) and tax capital groups,
• from 1 January 2026 – other CIT and PIT taxpayers keeping full accounting books,
• from 1 January 2027 – remaining PIT and CIT taxpayers required to submit the JPK_V7K file.

The first JPK_KR_PD files will be submitted in 2026, together with the annual CIT return.

 

How to prepare and submit JPK CIT step by step

Preparing the system and chart of accounts

Preparing for the submission of JPK CIT requires updating the accounting system and adjusting the chart of accounts.
First, it is necessary to ensure that the accounting system used supports the JPK CIT structure. Next, tax tags must be assigned to balance sheet and profit and loss accounts, the accounting policy should be updated, and the process of recording fixed assets and depreciation should be verified (also with regard to the future JPK_ST_KR structure).

Generating and submitting the file

The JPK CIT file must be prepared in XML format in accordance with the structure defined by the Ministry of Finance.
After being signed with a qualified electronic signature or via a trusted profile, the file can be submitted through the e-Declarations system or directly from the accounting software.

 

Most common JPK CIT errors

In practice, many companies make errors already at the stage of account mapping or generating XML files.
The most common issues include:

• incorrect assignment of accounting account tags,
• inconsistencies between JPK data and the CIT return,
• incorrect control totals or invalid contractor data,
• problems with electronic signature validation.

 

Tax audits and JPK CIT

Data from JPK CIT constitutes the basis for automatic risk analysis and selection of entities for audits by the tax administration.
To prepare for potential inquiries from the authorities, it is advisable to gather in advance:

• source documents confirming transactions,
• depreciation schedules and fixed asset registers,
• justifications for differences between accounting and taxable profit.

 

Penalties and sanctions

Errors in JPK CIT that prevent data verification may result in a penalty of up to PLN 500 for each error.
In the case of serious irregularities, a fine of up to 240 daily rates may be imposed.

A taxpayer who independently detects an error and corrects it within 14 days will avoid financial sanctions.

 

Benefits of implementing JPK CIT

Although JPK CIT involves additional obligations, implementation of the regulations also brings tangible benefits:

• better organisation of the chart of accounts and accounting processes,
• improved data quality and consistency between accounting and tax records,
• automation of reporting and reduced risk of errors,
• greater transparency and faster preparation for tax audits.

 

Summary

The introduction of JPK CIT is one of the most important stages in the digitisation of the Polish tax system.
The new obligations require companies to prepare their accounting systems, analyse the chart of accounts, and validate data before the end of 2025.

Early implementation of the changes will help avoid errors and sanctions, while also streamlining reporting processes and increasing control over financial data.

 

FAQ

Who is subject to JPK CIT from 2025?
The largest CIT taxpayers and capital groups with revenues exceeding EUR 50 million.

Does JPK CIT apply to all companies?
Yes. From 2026, it will cover most CIT and PIT taxpayers keeping full accounting books.

Does JPK CIT replace the financial statements?
No. JPK CIT supplements the data submitted to tax authorities.

Does reporting include KSeF data?
Yes – from 2026, JPK CIT will be integrated with KSeF document numbers.

What are the penalties for errors in JPK CIT?
PLN 500 for each error preventing data verification; in the case of serious violations – a fine of up to 240 daily rates.

 

Author:
Żaneta Jędrusik, Manager, MDDP Outsourcing Polska