PIT-36L Flat Tax Calculator Poland 2026

PIT-36L is the annual tax return for entrepreneurs taxed under the 19% flat tax rate in Poland. It must be filed by 30 April of the following year. The form is exclusively for sole traders and civil-law partnership members who have opted for the flat rate.

The flat tax rate is 19% regardless of income level. There are no progressive brackets or tax-free allowance, which differentiates it from the progressive tax scale. The uniform rate can be advantageous for high earners.

Taxable income = revenue minus deductible costs. Revenue includes all business receipts, while costs are documented expenditures incurred to generate revenue. If costs exceed revenue, taxable income is zero.

Since 2022 the health contribution cannot be deducted from the tax itself, but on PIT-36L it can be deducted from taxable income (or booked as a cost). Entrepreneurs pay 4.9% of income (minimum 432.54 PLN/month in 2026 = 9% of the minimum wage). The annual deduction cap for 2026 is 14,100 PLN (Minister of Finance notice of 12 Dec 2025, M.P. 2025 item 1274).

The 19% flat tax is generally more beneficial at incomes above 120,000–130,000 PLN per year, when the progressive 32% bracket applies. Below that threshold the progressive scale with the 30,000 PLN tax-free allowance may be more favourable. Each case should be assessed individually.

No. Choosing the flat tax excludes the option of filing jointly with a spouse and the family relief. This is a significant disadvantage for families with children or spouses with large income differences.

Flat tax filers can deduct ZUS social contributions, health insurance up to the 14,100 PLN cap (2026), prior-year business losses, and R&D expenditure. The family relief, rehabilitation relief, and other personal reliefs are not available.

The change can be made by the 20th day of the month following the first month in which income was earned in the new year — usually by 20 February. The decision is binding for the entire tax year.

Monthly or quarterly advance payments are prepayments towards the annual tax liability. After filing PIT-36L a final settlement is made. If advances exceeded the tax due, a refund is issued. If they fell short, the balance must be paid.

Results are estimates and do not constitute tax advice. The calculator does not account for all deductions and specific situations. For an accurate PIT-36L settlement, consult a qualified tax adviser or accountant.