Czech corporate income tax: from accounting profit to what the state taxes

A Czech company that makes a profit will in due course hand part of it to the state. The mechanism is corporate income tax, daň z příjmů právnických osob, which applies to limited companies, joint-stock companies and some other legal entities. The rate is unremarkable by European standards. What matters is how the taxable profit is worked out, and the gap between what the accounts say and what the tax code accepts.

Who pays, and on what

A company with its seat or place of management in Czechia is tax resident and taxed on its worldwide income. A foreign company is taxed only on Czech-source income, typically through a permanent establishment or on certain payments. Tax treaties between Czechia and other countries divide taxing rights and limit double taxation.

The law is the Income Tax Act (no. 586/1992 Coll.). The corporate rate is 21% (as of 2026; check the official source, the Financial Administration). It was lower for some years and rose from the 2024 tax period, so older sources may quote a different figure.

From accounting profit to tax base

The starting point is the profit or loss in the financial statements, prepared under Czech accounting rules. The Income Tax Act then demands adjustments. Some income is exempt or taxed separately. Some costs are not deductible, or only within limits. Timing differences arise as well, depreciation being the usual one, because the tax rules have their own methods.

The result is the tax base (základ daně), on which the tax is calculated, then reduced by any credits and advances already paid. For a small company the practical point is simple: accounting profit and taxable profit are two numbers, and the tax office cares about the second.

What counts as deductible

Broadly, an expense is deductible if it was incurred to earn, secure and maintain taxable income. The law also lists costs that are never deductible or only partly so. Entertainment and gifts above the limits, fines and penalties, certain provisions and expenses with no documented business purpose are the typical examples. Transactions between related parties must be at arm's length, and the tax office can adjust prices that are not.

Documentation decides a great many disputes. A cost that was real but badly evidenced is often a cost the tax office refuses. Keep the invoice and the contract, and write a line on the business reason for anything unusual.

Depreciation

Equipment and buildings are not written off in one go. Tangible assets above a set value and with a long enough useful life are depreciated over time for tax purposes, using asset groups and methods defined in the Act. These can differ from the depreciation in the accounts. Cheaper items may be expensed at once. Thresholds and groups change, so look them up for the year in question.

Losses

A tax loss can generally be carried forward against profits of the following five tax periods, and since 2020 it can also be carried back to the two preceding periods within limits (Income Tax Act, § 34; as of 2026; check the official source). Conditions apply, including rules meant to stop people buying loss-making companies for the tax benefit, so a change of owner or business can restrict the use of losses.

Reading the calculation as an owner

Think of the tax computation as a short list of adjustments applied to the accounting profit. Add back the costs the Act will not accept. Subtract income that is exempt or taxed elsewhere. Replace accounting depreciation with tax depreciation. Apply any loss carried forward. What remains is multiplied by the rate, and credits and advances are taken off. A small company's accountant can usually show this on one page, and asking to see it once a year teaches you more about your own business than the return itself.

The most common surprises are not exotic. A client gift above the limit, a fine, a car cost with a private element, or a payment to a related party at a price the tax office finds generous: each adds to the base. The same goes for provisions that the Act does not recognise. None of these is a scandal. They are the reason the tax base is rarely the same number as the profit in the accounts.

The second layer

Corporate tax is paid on profit at company level. When the profit is paid out to shareholders a separate layer follows, often as withholding tax at source. Our explainer on dividends covers it, and the combined burden is why the choice between retaining and distributing profit matters.

Filing and paying

A company files an annual return for its tax period, normally the calendar year or a chosen accounting year, and companies file electronically. Under the Tax Procedure Code (no. 280/2009 Coll., § 136) the deadline is three months after the period ends, one month more for a return filed electronically, and six months when the accounts must be audited by law or a tax adviser with a power of attorney lodged in time files the return (as of 2026; check the official source for the dates).

Advance payments during the year depend on the previous year's tax; smaller amounts are settled with the return. The Financial Administration publishes the details. A company with a loss pays no tax but still files. A late return brings a penalty, late payment brings interest, and a company that never files risks an assessment based on the tax office's own estimate. The filing in the tax office and the deposit of accounts in the register are separate jobs, as explained in annual accounts filing.

Other taxes, and the line on avoidance

Corporate income tax is separate from VAT, from payroll taxes and contributions, from road tax and from real estate tax. A company can be in order with one and behind on another. Our guide to payroll for employers covers the payroll side.

The system distinguishes planning from abuse. Transactions with no economic purpose beyond a tax advantage can be recharacterised. Artificial splitting of activities, profits routed through low-tax jurisdictions without substance and loans to shareholders on non-commercial terms attract attention. If a structure looks too clever, ask the adviser why it works and what it assumes.

A month before year-end, ask your accountant for a forecast of the company's taxable profit and a list of the items that will be adjusted in the tax base. That conversation lets you act on timing and documentation while there is still time. A forecast in December is a plan. The same figures in March are a bill.

Where to check

The Income Tax Act (no. 586/1992 Coll.) is the source, and the Financial Administration publishes the forms, the filing dates and the guidance. Look up the depreciation groups and the loss rules for the specific year, because they have changed before.

Frequently asked questions

Does a foreign-owned Czech company pay the same rate?

Yes. Ownership does not change the rate. A company with its seat or place of management in Czechia is tax resident and taxed on its worldwide income.

Can a loss be used against later profits?

Generally yes, for a limited number of years, with conditions. A change of owner or business can restrict the use of losses.

Do I file a tax return if the company made a loss?

Yes. A company with a loss pays no tax but still files.

Is the accounts deposit the same as the tax return?

No. The tax return goes to the tax office; the accounts go to the commercial register. They have separate deadlines and recipients.

This is a general explainer, not legal or tax advice. Rules change; check the official source or a licensed adviser.