Estonian CIT in 2026: 22,454 companies enrolled, two flat rates, one amendment tightens the rules

From 515 to 22,454 companies in four years - Estonian CIT moved from curiosity to mainstream

Poland's flat-rate corporate income tax - colloquially known as "Estonian CIT" - entered into force on 1 January 2021. The first year brought just 515 companies onto the regime. Three amendments (2022, 2023, 2024) and rising classic-CIT comparisons did the rest: by the end of January 2024 the system already covered 16,305 entities, by September 2024 - 18,602, and by October 2025 - 22,454 companies. That's a 44× increase in four years.

The jump is starker still in a single month: in January 2024 alone, 2,033 new companies moved onto Estonian CIT - five times more than in a typical month the year before. The reason - earlier MF interpretations had cleared the two most common doubts (shareholder car expenses and fixed-asset depreciation), and classic CIT at 19% became relatively more expensive after rises in the minimum wage.

Two rates, two worlds: 10% for the small, 20% for the rest

Estonian CIT has two flat rates on company profits:

• 10% - for small taxpayers (revenue ≤ EUR 2 m in the previous year) and newly formed companies.
• 20% - for everyone else.

The flat rate is only the first layer of taxation. The second is PIT on profit distributions to shareholders (19%, with a credit for the proportional CIT). The result:

• small taxpayer: 20% effective combined burden (CIT + PIT),
• others: 25% effective.

For comparison - classic CIT runs 9% (small taxpayer) or 19% (others), plus 19% PIT on dividends, giving 26.3% (small) or 34.4% (others) effective combined burden. Estonian CIT is therefore noticeably cheaper in effective terms - but only if profits are distributed. For companies reinvesting all profits, the gap widens further, because the flat-rate tax is paid only at the moment of distribution.

Who qualifies in 2026 - four conditions you cannot work around

To choose the flat-rate corporate income tax, a company must satisfy four statutory conditions in every quarter:

1. Legal form - only sp. z o.o., S.A., P.S.A., S.K.A. or sp.k. (corporate persons). Sp. j. and sp.c. are excluded.
2. Shareholder structure - all shareholders must be natural persons (or exempt entities).
3. No stakes in other entities - the company holds no stakes in other companies, financial institutions, foundations, etc. (exception: stakes up to 5% in a public company).
4. Employment - at least 3 full-time employees on average (or equivalent) for at least 300 days a year.

Plus an operational condition: less than 50% of revenue from passive sources (interest, royalties, rent, dividends from other companies).

The most common reason for rejection is the shareholder structure - the moment another company (an investment fund, a holding, a family-office) enters the cap table, the regime is automatically lost. That is the key trap for growing startups: the first significant VC round ends the flat-rate period.

The 2024 jump: why exactly then

2024 is the inflection point. Four main drivers, each with a concrete contribution:

• Higher small-taxpayer threshold for CIT - from 2024 the revenue cap was raised to EUR 2 m, giving more companies access to the 10% rate instead of 20%.
• Cumulative MF interpretations - by end-2023, more than 200 individual rulings had been published, dispelling doubts on the most controversial line items (shareholder cars, benefits to related natural persons).
• Rising labour costs - minimum-wage hikes in 2023 and 2024 raised the pressure on tax efficiency; the flat-rate became one of the few tools that genuinely lowers the burden.
• Automatic ZAW-RD renewal - from 2024 a company meeting the conditions no longer needs to file a fresh notification every four years, which had previously discouraged adoption.

The September 2025 amendment: cost definition, automatic renewal, tougher exits

The draft amendment to the CIT and PIT acts published on 16 September 2025 introduces the first major changes to Estonian CIT since 2022. Three are most consequential:

• Definition of "expenses unrelated to business activity" - until now the concept existed only in case law; now it is in statute. The legislator borrows from the classic deductible-expense framework: outlays incurred for purposes other than generating revenue or securing its source are not part of the Estonian-CIT base. A tightening - but also clarity that had been missing.
• Automatic ZAW-RD renewal for another 4 years - with no need to refile if the conditions are met. An administrative gain.
• Sharper hidden-profit rules - particularly for shareholder remuneration and benefits between related parties. This will hit family-owned firms that used artificially low board-member salaries as an indirect distribution mechanism.

Tax commentators note that the bill does not raise the rates but raises the cost of compliance. In practice: a company on Estonian CIT will need cleaner documentation of expenses and, in the most exposed cases, may have to abandon structures previously considered safe.

What you can read from a Polish company's KRS profile about Estonian CIT

“Estonian CIT stopped being a niche tool in 2024 - and 2026 is the first year in which the flat rate becomes the default for the average Polish sp. z o.o. with Polish shareholders and Polish customers. The MF amendment will not stop that trend, but it will raise the cost of a tax mistake - particularly for family-owned firms that today live on the thin line between 'board remuneration' and 'hidden profit distribution'.”

Estonian-CIT status is not published directly in the KRS - the ZAW-RD notice goes to the tax office, not the registry court. But the KRS profile lets you infer it with high probability: the legal form must be sp. z o.o., S.A., P.S.A., S.K.A. or sp.k.; shareholders must all be natural persons; the company must not hold stakes in other entities. All three are visible in our database under "Legal form", "Owners", and "Beneficial owners". Combined with the sp. z o.o. vs S.A. guide and the share-capital analysis (linked below), you get the full operational picture of whether a given company qualifies for the flat-rate corporate income tax.

Data: Ministry of Finance - draft amendment to the CIT and PIT acts of 16 September 2025; MF statistics - Estonian-CIT taxpayer counts 2021–2025; Code of Commercial Companies - corporate legal forms, as of 2026-05-01.