Poland's Uniform Control File for corporate income tax expands in 2026 to cover active VAT payers. Find out if your company is affected and what you need to prepare.
JPK_CIT is Poland's electronic reporting format for corporate income tax, rolled out in phases from 2025. Companies subject to this obligation must submit detailed accounting data in a standardised XML format to the tax authority. In 2026, the obligation extends to active VAT payers — check whether your company is already covered.
JPK_CIT replaces the older JPK_KR format and greatly expands the depth of financial data submitted to the tax office. Rollout schedule: • From 1 January 2025 — CIT payers with revenue above €50 million and tax capital groups. • From 1 January 2026 — CIT payers who are also registered active VAT payers (the majority of Polish limited liability companies and joint-stock companies). • From 1 January 2027 — all remaining CIT payers without exception. If your company is an sp. z o.o. or S.A. and a registered VAT payer, the obligation applies to you from 2026.
The JPK_CIT file consists of two main structures: 1. JPK_KR_PD — accounting books: journal entries, trial balance, general ledger accounts. Every transaction must carry a tax tag indicating its tax nature (deductible cost, non-deductible cost, revenue, etc.). 2. JPK_ST_KR — fixed assets register with both book and tax depreciation data. The critical requirement is the system of tax tags — every line in the books must be annotated so the tax authority can instantly assess its tax treatment.
JPK_CIT is submitted together with the annual CIT-8 return — by the end of the third month after the financial year ends (31 March for calendar-year companies). Penalties for non-compliance: • Procedural fine: up to PLN 2,800 per offence. • Criminal fiscal liability: up to 240 daily rates — potentially hundreds of thousands of PLN. • Increased risk of a full tax audit triggered by failure to file.
Implementing JPK_CIT requires changes in your accounting system and internal processes: • Verify your accounting software — check that it supports JPK_CIT export in the required XSD schema. • Map tax tags — assign the correct tax code to every analytical account; this is the most labour-intensive step. • Fixed assets register — ensure book and tax depreciation are tracked separately and exportable in JPK_ST_KR format. • Test export — run a trial export at least 3 months before the deadline and validate it against the Ministry of Finance validator. • Train your finance team — staff must understand the tag logic to correctly classify transactions. Danexis offers a full JPK_CIT readiness audit — from system verification to tag configuration and staff training.
Do not leave JPK_CIT preparation to the last minute — implementation takes time. Contact Danexis to check whether your company is already covered and what steps are needed before your next filing deadline.