What is Flat Tax? A Guide to the 19% Rate for Entrepreneurs in Poland

Flat tax (podatek liniowy) is one of the forms of taxation available to entrepreneurs in Poland for business income. Its essence is a uniform 19% personal income tax (PIT) rate applied regardless of the amount of income earned. This means an entrepreneur earning PLN 50,000 per year and one earning PLN 500,000 per year pay tax at the same percentage rate.

Flat tax is an alternative to the progressive tax scale (12% and 32%) and the lump-sum tax on recorded revenue. The choice of this form of taxation is regulated by Article 30c of the Personal Income Tax Act.

Who Can Choose Flat Tax?

Eligible Taxpayers

Flat tax may be used by:

  • Natural persons running a sole proprietorship (JDG) -- regardless of the type of activity performed (with one important exception described below).
  • Partners in civil partnerships, general partnerships, and professional partnerships -- each partner individually decides on the form of taxation for their share of profits.
  • General partners in limited partnerships (komandytowa) -- limited partners are taxed under different rules.

Who Cannot Choose Flat Tax?

There is one key restriction. A taxpayer cannot apply flat tax to income from activities performed for a former or current employer if, in the current tax year (or the previous year), they performed the same activities for that employer under an employment contract or cooperative employment relationship.

In simpler terms -- if you leave your job and start a business to provide services to the same employer, you cannot use flat tax for those services in the year of departure and the following year. This provision is designed to prevent optimisation consisting of replacing an employment contract with invoicing solely to reduce tax burdens.

How Does Flat Tax Work?

Calculating the Tax

The tax base is income, meaning revenue minus tax-deductible costs. The taxpayer pays 19% tax on the income calculated this way. There are no tax thresholds, no tax-free amount, and no rate degression.

Example: An entrepreneur generated revenue of PLN 400,000 and incurred tax-deductible costs of PLN 150,000. Income is PLN 250,000. Flat tax: 250,000 x 19% = PLN 47,500.

Tax Advance Payments

A flat-tax taxpayer makes monthly or quarterly advance payments on income tax. Monthly advances are paid by the 20th day of the month following the month they relate to. Small taxpayers (revenue up to EUR 2 million) may choose quarterly advances.

Annual Return PIT-36L

The annual settlement is filed on the PIT-36L form by 30 April of the following year. The taxpayer reports revenue, costs, income, paid advances, and any deductions.

Flat Tax vs Progressive Tax Scale -- Comparison

For a detailed comparison of both forms, see the article Flat Tax or Tax Scale?. Below are the key differences.

Tax Rates

  • Progressive tax scale: 12% on income up to PLN 120,000, 32% on income exceeding PLN 120,000. Tax-free amount: PLN 30,000 (meaning the first PLN 30,000 of income is untaxed).
  • Flat tax: uniform 19% rate on every zloty of income. No tax-free amount.

When is Flat Tax More Advantageous?

Flat tax begins to be more favourable when annual business income exceeds approximately PLN 120,000. Below this amount, the progressive tax scale is usually more advantageous thanks to the lower 12% rate and the tax-free amount (PLN 30,000).

The exact break-even point depends on the taxpayer's individual situation -- the amount of ZUS contributions, available deductions, and tax reliefs. It is worth using the flat tax calculator to compare the tax burden under different forms of taxation.

Lost Privileges

By choosing flat tax, an entrepreneur gives up several significant preferences available under the progressive tax scale:

  • No joint filing with spouse -- under the tax scale, joint filing can reduce tax when one spouse earns significantly more.
  • No tax-free amount -- under the scale, the first PLN 30,000 of income is untaxed; with flat tax, tax is calculated from the first zloty.
  • Limited tax reliefs -- flat-tax taxpayers cannot use the child tax relief (ulga prorodzinna). They can, however, deduct social insurance contributions, IKZE payments, and donations.

Health Insurance Contribution Under Flat Tax

Since 2022 (Polski Lad reform), the health insurance contribution under flat tax is 4.9% of income. There is no upper cap on the contribution -- the higher the income, the higher the health insurance amount. The minimum monthly contribution cannot be lower than 9% of the minimum wage.

A crucial point: the health insurance contribution under flat tax is not deductible from tax or from income (except for a limited deduction of up to PLN 11,600 per year from income, applicable in 2024 and 2025 -- this amount is indexed annually). In practice, the health insurance contribution is an additional burden that must be taken into account when comparing forms of taxation.

The effective income burden rate under flat tax (tax + health insurance) is therefore approximately 23.9% (19% + 4.9%), reduced by any partial health insurance deduction.

How to Choose Flat Tax?

Deadline for Selection

Flat tax is chosen by submitting a declaration:

  • By the 20th day of the month following the month in which the first revenue was earned -- for a new business.
  • By 20 February of the tax year -- when changing the form of taxation for the next year.

The declaration is submitted on the CEIDG-1 form (when registering or updating the CEIDG entry) or in writing to the head of the tax office.

Changing the Form of Taxation

The flat tax choice applies for the given tax year. The taxpayer may change the form of taxation for the following year by submitting an appropriate declaration by 20 February. It is not possible to change the form of taxation during the tax year.

Who Benefits Most from Flat Tax?

Flat tax works best for entrepreneurs who:

  • earn income above PLN 120,000 per year,
  • do not use joint filing with a spouse,
  • do not need the child tax relief,
  • run a business with relatively low tax-deductible costs (e.g., IT services, consulting, freelance professions),
  • value simplicity and predictability in tax settlements.

Summary

Flat tax is a uniform 19% PIT rate on business income, regardless of its amount. It provides predictability of tax burdens but comes with the loss of the tax-free amount, joint filing with a spouse, and the child relief. The 4.9% health insurance contribution on income is an additional cost. It is most advantageous primarily for incomes exceeding approximately PLN 120,000 per year.

Choosing the optimal form of taxation is one of the most important tax decisions for an entrepreneur. The LinTax accounting office in Wroclaw can help you analyse different scenarios and choose the most advantageous form for your situation. You can find a comparison of taxation forms in the article Flat Tax or Tax Scale?, and you can run the calculations yourself using the tax calculator.