The Czech personal income tax (daň z příjmů fyzických osob) is unusually simple by European standards: two rates, one threshold, and a flat social contribution on top. What catches people out is not the tax itself but the threshold, which is not a fixed koruna figure — it is defined as 36 times the average monthly wage, so it moves every year and is published by the tax administration rather than written into the law as a number.
What you enter
The calculator takes gross annual employment income in Czech koruna. It applies the two-rate scale to that figure and then shows the employee social and health contributions separately, because those are withheld at source and are not part of the income tax itself. If you are self-employed the contribution base differs, so the take-home figure here is specific to employment.
How the tax is computed
For 2024 the first band is 15% and applies to income up to 36 times the average monthly wage, which works out to roughly CZK 1,582,812. Everything above that threshold is taxed at 23%. The 23% rate is not a surcharge on the whole income — it applies only to the slice above the threshold, exactly like the lower band. A taxpayer earning CZK 2,000,000 therefore pays 15% on the first CZK 1,582,812 and 23% on the remaining CZK 417,188.
A worked example
Take a gross salary of CZK 900,000. All of it falls in the 15% band, so the income tax is CZK 135,000. Employee social insurance is 6.5% and health insurance is 4.5%, together 11% of gross, or CZK 99,000. Net before any tax credits is CZK 666,000. The taxpayer credit (sleva na poplatníka) then reduces the tax by a fixed annual amount, which is why most Czech employees pay noticeably less than the raw 15% suggests.
Assumptions and references
Rule year 2024. The threshold is 36× the average monthly wage as published for 2024; the calculator uses the resulting CZK 1,582,812 figure. The taxpayer credit and other credits are not applied. Employee social insurance is 6.5% and health insurance 4.5% of gross. Self-employment, the solidarity surcharge for very high incomes, and the flat-rate expense allowances for the self-employed are not modelled. Source: Finanční správa, income tax rates for 2024.