Czechia's flat tax regime starts at 9,984 CZK a month in 2026. Whether that's actually the cheaper option depends entirely on your real numbers, not on what a neighbor chose or what the first article you find recommends.
Most self-employed tradespeople pick a regime once, at the start of their business, and never revisit it. It's worth recalculating every year, especially once income or expenses change.
Key Takeaways
- The flat tax (paušální daň) has three bands in 2026, 9,984, 16,745, and 27,139 CZK a month, based on income (Finanční správa, autoerp.cz, 2026)
- Flat tax and expense percentages (60%, 80%, 40%) are two different things, the first replaces tax and insurance with one payment, the second is just an expense calculation method inside a normal tax return
- Real, documented expenses pay off when they exceed the expense percentage available for your trade
- Registering or changing bands for 2026 had to be reported by 12 January 2026 (Finanční správa, 2026)
What does the flat tax actually replace?
The flat tax (paušální daň) is a single monthly payment that replaces income tax and both social and health insurance advances combined (Finanční správa, 2026). Instead of three separate payments and an annual tax return, you send one amount and you're done.
It's available to self-employed people with annual income up to 2 million CZK who aren't VAT payers and don't have employment income above a certain threshold. The main advantage is administrative, no annual return, no recalculating advances based on actual income.
How much do the 2026 bands actually cost?
Three bands apply in 2026: 9,984 CZK a month for income up to 1 million CZK, 16,745 CZK up to 1.5 million, and 27,139 CZK up to 2 million (Finanční správa, autoerp.cz, 2026). Which band applies depends on income level and, in part, on the type of trade.
The Ministry of Finance has also signaled that the increase to the first band for 2026 likely won't be permanent, expecting a reduction of more than 800 CZK a month sometime during the year (autoerp.cz, 2026). If you're in the first band, it's worth watching whether that materializes.
How is the flat tax different from expense percentages?
This is where most people get confused. The flat tax replaces the entire tax and insurance process with one payment, while expense percentages, 80%, 60%, or 40% depending on the trade, are just a way to calculate deductible expenses inside a normal tax return (Finance.cz, businessinfo.cz, 2026). The two can't be combined.
Craft trades can claim 80% of income as expenses without documentation, other trades 60%, other self-employment activity 40%. If you earn a million CZK from a craft trade, the expense percentage automatically credits you 800,000 CZK in expenses, even if your real costs were lower.
When does it pay to use real, documented expenses instead?
Real expenses pay off exactly when your documented costs, materials, tools, transport, workshop rent, exceed the expense percentage available for your trade. For a craft trade with an 80% allowance, that means actual costs would need to exceed four-fifths of income, which mostly happens after large one-off equipment investments.
The downside of real expenses is clear: you need to keep records and save every receipt, which is more administrative work than either flat option.
How and when do you switch between regimes?
Registering or changing bands for the flat tax in 2026 had to be reported to the tax office by 12 January 2026, with monthly payments due by the 20th of each month (Finanční správa, 2026). If you missed the deadline, the next opportunity is with the following calendar year.
That's exactly why it pays to recalculate in advance rather than waiting until January. The more consistent work and income you have, the more accurate the numbers you can actually plug into this comparison, since getting more jobs and choosing the right tax regime are closely connected.
Build a profile that gives you real numbers to work with
Whether you choose the flat tax or real expenses, the decision is only as good as your actual numbers. A complete profile on Tool Connect helps you build steadier, more predictable income, which makes this comparison far easier to run.
Set up your profile at tool-connect.com.
FAQ
How much does the flat tax cost in 2026?
Three bands, 9,984 CZK a month for income up to 1 million CZK, 16,745 CZK up to 1.5 million, and 27,139 CZK up to 2 million (Finanční správa, autoerp.cz, 2026).
Is the flat tax the same as an expense percentage?
No. The flat tax replaces tax and insurance with one payment. An expense percentage is just an expense calculation method inside a normal tax return, and the two can't be combined.
When do real expenses pay off?
When your documented costs exceed the expense percentage available for your trade, 80% for craft trades, 60% for other trades, 40% for other self-employment activity.
By when did I need to register for the flat tax in 2026?
By 12 January 2026. If you missed that deadline, the next opportunity is with the following calendar year.
Sources and Data
| Data point | Value | Source |
|---|---|---|
| Flat tax Band 1 (2026) | 9,984 CZK/month, income up to 1 million CZK | Finanční správa, autoerp.cz, 2026 |
| Flat tax Band 2 (2026) | 16,745 CZK/month, income up to 1.5 million CZK | Finanční správa, autoerp.cz, 2026 |
| Flat tax Band 3 (2026) | 27,139 CZK/month, income up to 2 million CZK | Finanční správa, autoerp.cz, 2026 |
| Expense percentages by trade | 80% craft trades, 60% other trades, 40% other self-employment | Finance.cz, businessinfo.cz, 2026 |
| 2026 registration/band-change deadline | 12 January 2026 | Finanční správa, 2026 |
| Monthly payment due date | 20th of each month | Finanční správa, 2026 |