A new chapter in Poland’s tax transparency strategy
Poland’s new JPK_CIT regime represents a major change in the area of corporate income tax compliance, including how tax settlements are documented and presented, as well as the overall level of tax disclosure.
For multinational groups, foreign investors, and CFOs overseeing operations in Poland, this is far more than an additional reporting obligation. The scope and level of detail of the tax data to be provided go beyond the existing standard reporting requirements. As a result, the way tax authorities receive, review, and use corporate tax data will change significantly.
JPK_CIT reporting will launch with the largest taxpayers, which will submit their 2025 accounting books and tax settlements electronically for the first time in July 2026. This marks a fundamental shift in tax oversight, as authorities will gain ongoing visibility into corporate operations instead of reviewing them only after an audit is formally initiated. In doing so, the tax administration is moving from retrospective verification towards a model of continuous and direct data analysis. Other business categories will be phased into this obligation in the coming years.
Scope of JPK_CIT reporting
The JPK_CIT structure consists of two reporting files:
JPK_KR_PD – covers counterparty master data, the trial balance, account tagging, posting journals, and data required to determine taxable income; and
JPK_ST_KR – contains detailed information on fixed assets, for both tax and accounting purposes, such as acquisition and disposal dates, depreciation methods, and document references; e.g., OT (fixed asset acceptance) and LT (fixed asset liquidation or transfer) numbers.
For many companies – especially those with fixed assets recorded many years ago – collecting and standardising this information may require significant preparation.
A fully connected tax ecosystem
A key feature of the new regime is its integration of income tax reporting with a broader digital tax ecosystem. In practice, this means that JPK_CIT data can be cross‑referenced with VAT reporting, invoices submitted through the National e-Invoicing System (KSeF), and transfer pricing information (the TPR form). This allows authorities to build a comprehensive digital profile of the taxpayer and automatically identify discrepancies across multiple reporting streams.
The reform also enables the tax administration to make extensive use of advanced data analytics. Automation will enable large-scale analysis of data and make it easier to spot unusual transactions or errors. As a result, audits are likely to become more targeted, with potential risk areas identified even before a formal audit is initiated.
Which areas are likely to be reviewed by the tax authorities
The tax authorities are likely to focus on entities generating tax losses and on transactions that reduce the CIT base. Related-party transactions can also be expected to come under closer scrutiny, especially when cross‑checked against transfer pricing documentation. In addition, the authorities will be able to easily verify payroll and social security (ZUS) settlements, types of employment arrangements, details of transactions with non‑residents, and the correct fulfilment of the payer’s withholding tax obligations.
As a result, any inconsistencies between accounting records, VAT reporting, and transfer pricing documentation (TPR filings) will become much easier for the tax authorities to detect.
Data quality as the cornerstone of tax risk management
With the introduction of JPK_CIT, data quality becomes a critical factor in effective tax risk management. Inconsistencies in the chart of accounts, transaction classification, or tagging can be immediately picked up by the tax authority’s analytical tools. Errors that previously might have remained unnoticed until a tax audit are now likely to be flagged automatically.
Companies should therefore verify whether their accounting systems allow them to clearly distinguish, in their ledgers, between related‑party and third‑party transactions, as well as between items that are taxable and non‑taxable for CIT purposes. ERP systems may need to be adjusted to correctly generate JPK_CIT files. Importantly, these classifications are not merely technical – they directly influence how the tax authorities interpret a company’s data. Incorrect mapping or tagging of accounts can result in systemic reporting errors and increase the likelihood of an audit.
What global CFOs should do now
For global investors and multinational groups, JPK_CIT is more than just another reporting obligation – it represents a strategic shift in how tax positions are supervised and challenged. Poland is moving towards a model in which the tax authorities rely on granular accounting data rather than only on aggregate figures in tax returns.
In this digital tax environment, success will depend on combining the right technology with robust internal controls. Today, avoiding disputes with the tax authorities hinges above all on the reliability and consistency of financial data. Businesses that invest early in cleaning and structuring their data will significantly reduce the risk of future audits and tax controversies.
