A Warsaw-based software company reports a loss for the second year running. Its board assumes that no taxable income means no corporate income tax. Then the tax adviser flags a problem: the podatek minimalny CIT (CIT minimum tax) may apply regardless of the loss position. The question of who pays – and who is safely exempt – turns out to be far less obvious than most boards expect.

Poland's CIT minimum tax applies to companies and tax capital groups that report a loss or an income-to-revenue ratio below 2% in a given tax year. The tax base is calculated at 1.5% of qualifying revenue, and the standard rate is 10%. Specific statutory exemptions – covering start-ups, small taxpayers, and companies in financial difficulty, among others – can eliminate the obligation entirely for eligible entities.

This guide walks through the exemption catalogue, the base calculation, the filing timeline, and three business scenarios where the outcome differs sharply depending on structure. A decision matrix and a practical checklist close each section so that finance teams can self-assess before the annual return deadline.

What triggers the CIT minimum tax obligation?

The CIT minimum tax activates when two conditions are met simultaneously. First, the taxpayer is a company resident in Poland or a tax capital group registered with the National Court Register (KRS). Second, in the relevant tax year the taxpayer either reports a loss from operating activity or achieves an income-to-revenue ratio below 2%. Both thresholds are calculated on the basis of Polish ustawa o podatku dochodowym od osób prawnych (Corporate Income Tax Act, CIT Act) rules – not on accounting profit.

The ratio test uses qualifying revenue as the denominator. Qualifying revenue excludes certain items: gains on disposal of fixed assets, subsidies received, and selected financial income. This narrowing matters. A company with PLN 10m in total accounting revenue might have qualifying revenue of PLN 8.5m for minimum tax purposes, shifting the 2% threshold downward.

The tax itself is calculated at 10% of the tax base. The base equals 1.5% of qualifying revenue plus certain add-backs – principally related-party debt financing costs and certain intangible service fees paid to affiliates. Those add-backs connect the minimum tax to transfer pricing discipline: companies with thin capitalisation structures face a higher base. The Polish Financial Supervision Authority (KNF) and the National Revenue Administration (KAS) have both flagged cross-border intra-group arrangements as a priority audit area for 2025 and 2026.

One practical point: any regular CIT paid for the same year reduces the minimum tax due, euro for euro. If regular CIT exceeds the minimum tax, there is nothing to pay. The minimum tax is therefore a floor – not an additional levy on top of ordinary tax.

Who qualifies for a statutory exemption?

Polish tax law lists over a dozen exemption categories. Finance teams should work through them in order, because satisfying any single category eliminates the obligation entirely. The most commercially significant exemptions fall into five groups.

Start-up period. Companies in their first three tax years of operation are exempt. The clock starts from the year of incorporation, not from the first year of trading. A company incorporated in 2023 is therefore exempt through 2025 inclusive – a window of 36 months.

Small taxpayer status. Companies whose gross revenue (including VAT) in the prior year did not exceed EUR 2m are exempt. This threshold aligns with the small taxpayer definition used elsewhere in the CIT Act. A family foundation – fundacja rodzinna – is a separate legal form and is outside the scope of the minimum tax entirely under a dedicated carve-out.

Financial difficulty. Companies that are insolvent or in restructuring proceedings before a Polish court are exempt for the duration of those proceedings. This exemption is time-limited: once proceedings close, the exemption lapses.

Significant revenue decline. If revenue in the current year falls by more than 30% compared to the prior year, the company is exempt. The 30% threshold is measured on qualifying revenue, not accounting turnover.

Sector carve-outs. Companies whose income derives exclusively from certain regulated activities – including mining, extraction, and select financial services supervised by KNF – benefit from specific exclusions. IP Box regime participants should note that IP Box income is excluded from the minimum tax base, though it remains in the denominator for the ratio test.

  • First three years of operation – exempt
  • Gross revenue below EUR 2m in prior year – exempt
  • Revenue decline exceeding 30% year-on-year – exempt
  • Active insolvency or restructuring proceedings – exempt
  • Family foundation legal form – exempt under dedicated carve-out

How is the tax base calculated in practice?

Three business scenarios illustrate how the base calculation works – and where it can surprise. Each scenario assumes a Polish-resident company with a December year-end filing an annual CIT return by the end of March.

Scenario A – Manufacturing company, Mazowieckie region. A mid-size manufacturer reports a loss of PLN 1.2m on qualifying revenue of PLN 40m. No related-party financing. Base = 1.5% × PLN 40m = PLN 600,000. Tax = 10% × PLN 600,000 = PLN 60,000. No regular CIT to offset. Minimum tax due: PLN 60,000. The company is not exempt under any category.

Scenario B – IT services company, Kraków. A software house with qualifying revenue of PLN 8m reports an income ratio of 1.8% – just below the 2% threshold. It pays intra-group licence fees of PLN 500,000 to a related party. Base = (1.5% × PLN 8m) + PLN 500,000 = PLN 120,000 + PLN 500,000 = PLN 620,000. Tax = PLN 62,000. However, the company qualifies for the IP Box regime on part of its income. IP Box income is excluded from the base calculation, reducing qualifying revenue to PLN 5m. Recalculated base = (1.5% × PLN 5m) + PLN 500,000 = PLN 575,000. Tax = PLN 57,500. The transfer pricing add-back dominates. For a deeper look at structuring IP income across borders, see our analysis of ESOP structuring for Polish start-ups and tech companies.

Scenario C – Foreign investor's Polish subsidiary. A German group establishes a Polish operating subsidiary in Lower Silesia. The subsidiary is in its second tax year and has gross revenue below EUR 2m. It is exempt on both the start-up and small-taxpayer grounds. No minimum tax is due. Planning for the third year – when the start-up exemption lapses – should begin now. Cross-border holding structures are discussed further in our Luxembourg tax structuring practice.

We secured a reclassification of intra-group financing costs that reduced the minimum tax base by over PLN 800,000 for a manufacturing client in the Mazowieckie region (autumn 2025). The reclassification turned on whether certain payments constituted debt financing costs under the CIT Act add-back rule – a question that requires careful document review before the return is filed.

What are the filing steps and deadlines?

The CIT minimum tax is reported on the standard annual CIT return – the CIT-8 form – filed by the end of the third month after the close of the tax year. For a December year-end, the deadline is 31 March. No separate minimum tax return exists. The taxpayer declares the base, applicable exemptions, and tax due within the existing CIT-8 structure.

Four steps cover the full compliance cycle.

  • Step 1 – Determine qualifying revenue: strip out excluded items from accounting revenue by the end of January.
  • Step 2 – Apply the ratio test: calculate income divided by qualifying revenue. If above 2% and no loss – stop, minimum tax does not apply.
  • Step 3 – Check the exemption catalogue: work through each statutory category. Document the basis for any exemption claimed.
  • Step 4 – Calculate the base and offset: apply the 1.5% rate to qualifying revenue, add any transfer pricing add-backs, then deduct regular CIT paid.

Advance payments are not required for the minimum tax. The full amount is settled with the annual return. However, if a company anticipates a minimum tax liability and has underpaid regular CIT during the year, late-payment interest at 8% per annum (the standard KAS rate as of early 2026) will accrue on any shortfall from the regular CIT advance payment schedule.

For companies using the KSeF Poland e-invoicing system, VAT data submitted through KSeF feeds directly into KAS audit algorithms that cross-reference declared revenue with minimum tax bases. Discrepancies between KSeF invoice totals and CIT-8 qualifying revenue figures are a known audit trigger. Companies integrating KSeF workflows should reconcile both datasets before filing. The KSeF compliance timeline for 2026 and 2027 is set out in our separate guide on the KSeF deadline timeline for companies in Switzerland – which also covers Polish-connected entities operating across borders.

We obtained a favourable advance tax ruling confirming small-taxpayer exemption status for a Pomerania-based logistics company (spring 2026). The ruling locked in the exemption for the current year and provided a planning baseline for the year in which the EUR 2m threshold would be crossed.

What mistakes do companies make most often?

Four errors recur across almost every minimum tax review our tax advisory team in Warsaw conducts.

Treating accounting loss as equivalent to CIT Act loss. The two are not the same. Accounting depreciation, provisions, and foreign exchange differences are treated differently under the CIT Act. A company with an accounting loss may have positive CIT Act income – and vice versa. The ratio test and loss determination must use CIT Act figures throughout.

Overlooking the add-back rules. Many companies calculate the base at 1.5% of qualifying revenue and stop there. They miss the transfer pricing add-backs entirely. Intra-group service fees, royalties, and debt financing costs paid to related parties can multiply the base several times over. Polish tax law treats these add-backs as a deliberate anti-avoidance measure.

Claiming the start-up exemption in year four. The exemption covers the first three tax years. A company incorporated in late 2022 may have its first full tax year in 2023. The exemption runs through 2025. The 2026 return is the first exposure year. Missing this transition is one of the most common – and most expensive – oversights.

Ignoring the interaction with IP Box. IP Box income is excluded from the minimum tax base. But the ratio test still uses total qualifying revenue as the denominator. A company with large IP Box income and a thin margin on non-IP activity may fall below the 2% threshold while believing IP Box protects it fully. It does not. Only the base calculation benefits from the IP Box exclusion.

Checklist – what to prepare before filing:

  • Reconciliation of accounting revenue to CIT Act qualifying revenue
  • Documentation of each exemption category claimed
  • Schedule of related-party payments subject to add-back rules
  • Confirmation of IP Box election and excluded income amounts
  • Cross-reference of KSeF invoice totals against CIT-8 revenue figures

The personal liability exposure here is real. A tax advisor Warsaw-based practitioners regularly see is a director who signed off on a CIT-8 return without minimum tax disclosure, only to face a KAS audit 18 months later. Underpaid minimum tax carries interest at 8% per annum plus a potential penalty surcharge of 150% of the tax shortfall. That outcome is irreversible once the audit commences.

For companies with cross-border structures – particularly those using Luxembourg holding layers or Dutch intermediate companies – the interaction between minimum tax and double taxation treaties requires separate analysis. Treaty relief does not eliminate the minimum tax, because the minimum tax is framed under Polish law as a domestic levy rather than a tax on income within the treaty meaning.

Frequently asked questions

Q: Does the CIT minimum tax apply to branches of foreign companies operating in Poland?

A: A registered branch of a foreign company is not a separate legal entity under Polish law and is therefore outside the scope of the CIT minimum tax as currently drafted. The minimum tax applies to Polish-resident companies and tax capital groups. However, a Polish subsidiary – even one wholly owned by a foreign parent – is a separate resident entity and is fully within scope. The distinction between branch and subsidiary structure is material for minimum tax planning.

Q: How long does a KAS audit of minimum tax positions typically take, and what does it cost to defend?

A: A standard KAS tax audit focused on CIT issues typically runs six to twelve months from the opening notice to the final decision. Defence costs depend on complexity: a straightforward exemption dispute may require 20 to 40 hours of adviser time, while a base calculation challenge involving transfer pricing add-backs can extend to 80 hours or more. Advance tax rulings – which cost PLN 40 per question – are the most cost-effective protection against audit exposure on classification questions.

Q: Is it a common misconception that companies with zero revenue are exempt from the minimum tax?

A: Yes. Zero revenue means zero qualifying revenue, which means the 1.5% base calculation produces zero. In that sense, the company has no minimum tax to pay. But the exemption arises from the mathematics of the base, not from a statutory exemption. A company with zero revenue but significant related-party add-backs – for example, a holding company that has received intra-group loans – should verify whether those add-backs create a positive base independently of the revenue calculation. Polish tax law is explicit that the add-backs are cumulative with the revenue-based element.

Every company's situation carries specific facts that shift the analysis. A structure that qualifies for exemption in year two may be fully exposed in year three. The minimum tax is one of several areas – alongside transfer pricing, KSeF compliance, and Pillar Two – where the cost of a late review consistently exceeds the cost of an early one.

To receive an expert assessment of your company's CIT minimum tax position, contact info@kordeckipartners.com.

KORDECKI & Partners is a law firm based in Warsaw and Krakow, advising business clients across 30 jurisdictions. Our team combines expertise in Polish and international law with a practical approach to CIT minimum tax compliance, transfer pricing, and cross-border tax structuring. We work with Polish entrepreneurs, foreign investors, and in-house legal teams. To discuss your situation, contact info@kordeckipartners.com.

Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. KORDECKI & Partners assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@kordeckipartners.com.