Flat Tax Calculator

PIT rate

• 19% — fixed rate regardless of income
• No tax-free amount
• No joint filing with spouse

Health insurance contribution

• 4.9% of income
• Minimum: 432.54 zł (9% × 4,806 zł)
• Deductible from income up to 14,100 zł per year

When is it beneficial?

• Income above ~120,000 zł per year
• Lower health insurance contribution (4.9% vs 9%)
• Fixed rate provides predictability

Health insurance deduction

Entrepreneurs on flat tax can deduct paid health insurance contributions from income, but only up to a limit of 14,100 zł per year (in 2026). For income above approximately 290,000 zł per year, the limit does not cover the full contribution. This is a significant change introduced by the Polish Deal (Polski Ład).

Comparison with lump-sum tax

With low tax-deductible costs, lump-sum tax (e.g., 12% for IT) may be more beneficial than flat tax. Lump-sum tax also offers lower health insurance contributions in three fixed tiers. However, lump-sum tax does not allow deducting income-earning costs — the choice depends on the structure of revenues and costs.

Loss of flat tax eligibility

An entrepreneur loses the right to flat tax if they provide services to a former employer in the same scope as their previous employment — in the year of transitioning to B2B. This restriction applies to the first tax year after changing the form of employment.

How Does the 19% Flat Tax Work?

Under flat tax, all business income (revenue minus tax-deductible costs minus ZUS social contributions) is taxed at a uniform rate of 19%, regardless of amount. There is no tax-free allowance and no progressive brackets. You pay monthly or quarterly PIT advance payments calculated as 19% of cumulative income minus previously paid advances. ZUS social contributions (pension, disability, sickness, accident, Labour Fund) totaling approximately 1,926.76 PLN per month in 2026 are fully deductible from income. The health insurance contribution is 4.9% of income (minimum 432.54 PLN), and up to 14,100 PLN of paid health insurance can be deducted from income annually.

When Is Flat Tax Worth It?

The break-even point between the tax scale and flat tax occurs at approximately 120,000 PLN of annual income for a single person. Below this threshold, the tax scale's 12% rate plus the 30,000 PLN tax-free amount typically results in lower total tax. Above 120,000 PLN, the tax scale's 32% marginal rate makes flat tax increasingly advantageous. For an entrepreneur earning 200,000 PLN annually, flat tax saves roughly 10,000-15,000 PLN compared to the tax scale. The savings grow with income because flat tax remains at 19% while the tax scale rises to 32%. Additionally, the lower health insurance rate (4.9% vs 9%) adds further savings at high income levels.

Flat Tax and Health Insurance

Entrepreneurs on flat tax pay a health insurance contribution of 4.9% of income, with a minimum of 432.54 PLN per month (9% of the minimum wage of 4,806 PLN). Unlike the tax scale, where health insurance is 9% and fully non-deductible, flat tax allows deducting health insurance contributions from income up to a cap of 14,100 PLN per year. This means at income levels around 287,000 PLN annually, the deduction covers the full health insurance cost. Above that level, only the capped amount is deductible. For example, at 400,000 PLN annual income, health insurance is 19,600 PLN, but only 14,100 PLN reduces your tax base.

Comparison with Lump Sum and Tax Scale

At 15,000 PLN monthly revenue with 2,000 PLN in costs, the annual net income comparison is telling. On the tax scale, income of 156,000 PLN triggers the 32% bracket on 36,000 PLN, resulting in roughly 27,000 PLN in PIT. On flat tax, the same income yields about 29,640 PLN in PIT but with significantly lower health insurance (4.9% vs 9%). On lump-sum tax at 12% (IT), tax is 21,600 PLN on full revenue with no cost deduction. The optimal choice depends on your cost structure: high costs favor flat tax or tax scale, while low costs often make lump-sum tax cheapest. Always calculate your specific scenario rather than relying on general rules.

Advantages and Disadvantages

Advantages: Fixed 19% rate regardless of income level, lower health insurance at 4.9% (vs 9% on the tax scale), partial deductibility of health insurance up to 14,100 PLN, simple and predictable tax planning, and full deduction of business costs. Disadvantages: No 30,000 PLN tax-free amount (costing 3,600 PLN per year), no joint filing with spouse (critical when one spouse has low or no income), no child tax credit or most other personal deductions, and a restriction preventing services to a former employer in the same scope during the year of switching from employment to B2B. These trade-offs make flat tax suboptimal for lower-income entrepreneurs or those with families relying on tax credits.

Who benefits from the flat tax in Poland?

The 19% flat tax benefits entrepreneurs earning above PLN 120,000 per year. Below this threshold, the progressive tax scale (12%) is more favorable due to the PLN 30,000 tax-free amount.

Can I claim the child tax credit with flat tax?

No, the flat tax does not allow the child tax credit, joint filing with a spouse, or the tax-free amount. This is its main disadvantage for lower incomes.

What is the health insurance contribution on flat tax?

The health insurance contribution on flat tax is 4.9% of income with no upper limit and cannot be deducted from tax. For high earners, this can be a significant amount.

Can I change my tax form during the year?

You must notify the tax office by February 20th of the tax year to switch to flat tax. Changes during the year are not possible.

How do ZUS contributions work with flat tax?

Social ZUS contributions are deducted from income, reducing the tax base. The 4.9% health insurance contribution is calculated on income and cannot be deducted.