Disclaimer: This article is for informational purposes only and does not constitute legal or tax advice. Always verify requirements and deadlines at financnisprava.cz and consult a licensed Czech tax advisor (daňový poradce) for your specific situation.
Opening your datová schránka — or your physical letterbox — and finding an official envelope from the finanční správa (Czech Financial Administration) can feel alarming, especially if Czech is not your first language. The good news: most letters from the tax office are routine. The key is to understand what you received, check the deadline, and respond in time. This guide explains exactly how to do that.
Don't Panic — Most Letters Are Routine
The Czech tax authority sends a wide variety of correspondence. Many letters are not emergency notices — they may simply be informational updates, reminders about upcoming filing deadlines, or confirmations of registration. However, some letters do require action within a defined time window, so it is important to read every piece of official correspondence carefully rather than setting it aside.
The two key things to check immediately when you open any letter from finanční správa:
- What type of letter is it? Look for a heading at the top of the document (e.g., Výzva, Platební výměr, Rozhodnutí).
- Is there a deadline? Search the text for the word lhůta (deadline) or do followed by a date. This is the date by which you must respond or pay.
Common Letter Types You May Receive
Výzva k podání přiznání (Request to File a Tax Return)
This is one of the most common letters sent to OSVČ. The tax office is asking you to submit a tax return (daňové přiznání) that it believes you are required to file but has not yet received. This can happen if you are newly registered, if the authority has information that you earned income but no return was filed, or if your previous return raised questions.
The letter will specify which tax period is in question and set a deadline — usually 15 to 30 days from the date of the letter. Do not ignore this: if you fail to respond, the tax office may assess your tax liability on its own (náhradní způsob stanovení daně), which almost always results in a higher bill than an accurate return would.
Platební výměr (Payment Assessment)
A platební výměr is a formal decision stating that you owe a specific amount of tax, interest, or penalty. It has the force of a legal decision and triggers a payment deadline — typically 30 days from delivery. Read this letter immediately: it will state the amount owed, the legal basis, and the bank account and variable symbol to use for payment.
If you believe the assessment is incorrect, you have the right to appeal (odvolání) within 30 days of delivery. An appeal must be submitted in writing to the issuing tax office. Given the legal complexity, it is strongly advisable to engage a tax advisor before filing an appeal.
Výzva k odstranění pochybností (Request to Clarify Doubts)
Under §89 of Act No. 280/2009 Coll. (daňový řád — Tax Code), the tax authority may open a procedure to clarify doubts it has about the accuracy of your filed return. You will receive a letter listing the specific items they question and asking you to provide explanations or documentation — receipts, contracts, bank statements, or similar evidence.
This is not an accusation of wrongdoing. It is a standard verification procedure. Respond promptly and thoroughly with whatever documents the letter requests. Ignoring this notice will be treated as if the doubts were confirmed, which can result in an upward adjustment of your tax liability.
Rozhodnutí (Decision) and Výzva k uhrazení (Payment Demand)
Other letters you may encounter include formal decisions on your applications (registration, VAT status, deadline extensions) and demands to pay outstanding amounts. Each will clearly state the operative text (výrok), the legal reasoning (odůvodnění), and instructions on how to appeal if you disagree.
Deadlines: The Most Important Thing to Check
Czech administrative law under the daňový řád (Act No. 280/2009 Coll.) sets strict deadlines for responding to official notices. The deadline is almost always stated explicitly in the letter — search for lhůta (deadline) or a phrase like ve lhůtě 15 dnů (within 15 days) or do [date] (by [date]).
Typical deadlines:
- 15 days: Response to clarification requests (výzva k odstranění pochybností)
- 30 days: Response to a request to file a return (výzva k podání přiznání); payment under a platební výměr; filing an appeal against a decision
- 8 days: Some urgent procedural steps (less common for standard tax matters)
Deadlines run from the day of delivery, not the date printed on the letter. For mail delivered to your datová schránka, the clock starts on the day you log in to read it — or after 10 days of non-login, whichever comes first. Keep your datová schránka active and check it at least weekly.
How to Respond to a Tax Office Letter
Czech law provides several official channels for communicating with the tax authority. Choose whichever is most convenient for your situation.
In Person at the Finanční Úřad
You can visit the local tax office (finanční úřad) in person. Bring the original letter, your identification (passport or ID card), and any supporting documents requested. Staff are legally obliged to assist you and provide information about the procedure. If your Czech is limited, you may bring an interpreter; there is no formal requirement for the interpreter to be certified for most administrative visits, though a certified interpreter is advisable for hearings or depositions.
Find your local tax office using the office finder at financnisprava.cz.
Via Datová Schránka
If you have a datová schránka (which all OSVČ are required to have since January 2023), you can send your response directly through the secure messaging system at mojedatovaschranka.cz. Messages sent this way are legally equivalent to in-person submissions and have official timestamps. Include the reference number from the original letter in your message.
Via mojedane.cz
The portal mojedane.cz (My Taxes) is the Czech tax authority's online portal for filing returns, submitting forms, and communicating with the finanční úřad electronically. You can log in using your datová schránka credentials, a BankID (online banking identity), or a Czech NIA identity. From this portal you can file tax returns, upload supporting documents, and track the status of your cases.
What Happens If You Miss the Deadline?
Ignoring an official letter from the Czech tax office is never a safe option. The consequences escalate quickly:
Late Filing Penalty — §250 Daňový Řád
Under §250 of Act No. 280/2009 Coll., if you fail to file a tax return by the deadline, the tax office will charge a penalty of 0.05 % of the assessed tax per day of delay (for income tax returns), subject to a minimum of 500 CZK and a maximum of 5 % of the tax assessed. For longer delays the percentage increases.
Interest on Late Payment — §252 Daňový Řád
Under §252, interest on unpaid tax accrues at a rate of the Czech National Bank's repo rate plus 8 percentage points per year, calculated daily. In 2026 conditions, this amounts to a meaningful annual rate. The interest accrues from the day after the original payment deadline until the day of actual payment.
Enforcement (Exekuce)
If a payment demand or penalty remains unpaid after all procedural steps, the tax authority can initiate tax enforcement proceedings (daňová exekuce) — meaning it can seize funds from your bank account, deduct from receivables, or pursue other assets. This is a last resort, but it is a real one.
The bottom line: respond to every official letter, even if only to request an extension.
Getting a Tax Advisor — and the July 1 Extension
One of the most valuable things a Czech daňový poradce (licensed tax advisor) can do for you is extend your income tax filing deadline. Under §136(2) of Act No. 280/2009 Coll., if a licensed tax advisor files a power of attorney (plná moc) with the tax office on your behalf before the standard March 31 deadline, your income tax return deadline is automatically extended to 1 July of the following year.
This extension is automatic — no separate application is needed, just the timely filing of the power of attorney. If you are dealing with a complex situation, an ongoing audit, or a letter that you do not fully understand, engaging a tax advisor early buys you time and protects you from procedural missteps.
Find a licensed Czech tax advisor through the Chamber of Tax Advisors of Czech Republic (Komora daňových poradců ČR) at kdpcr.cz. Many advisors in Prague and larger cities offer services in English.
For other types of deadlines — such as responding to a výzva — you can also request a deadline extension directly from the tax office. Submit the extension request (žádost o prodloužení lhůty) in writing before the original deadline expires. The tax office has discretion to grant or deny the request, but it will generally consider genuine reasons such as illness, travel, or the need to gather documents.
How Taxorio Can Help
If the letter you received is a výzva k podání přiznání (request to file an income tax return), Taxorio can generate the XML file you need to submit via mojedane.cz. Based on your invoices and expenses recorded in the application, Taxorio calculates your income, applies your chosen deduction method (actual expenses or paušální výdaje), and exports a machine-readable return file in the format accepted by the Czech Financial Administration.
You can then upload the XML directly through mojedane.cz — no paper forms, no manual data entry into the portal. This significantly reduces the risk of transcription errors and saves time at a moment when deadlines matter.
Important: Taxorio generates your return based on the data you have entered. You remain responsible for verifying the accuracy of the data and for filing on time. When in doubt, have a licensed tax advisor review the output before submission.
Summary: Four Steps When You Get a Tax Office Letter
- Identify the letter type — look at the heading (Výzva, Platební výměr, Rozhodnutí, etc.)
- Find the deadline — search for lhůta or a specific date; note it in your calendar immediately
- Respond through an official channel — in person, via datová schránka, or via mojedane.cz
- If unsure, consult a daňový poradce — the cost of advice is almost always lower than the cost of a missed deadline
The Czech tax system can seem opaque when you are unfamiliar with it, but it operates by clearly defined rules. Once you know what to look for in a letter and where to respond, navigating official correspondence becomes manageable. Verify anything you are unsure about at financnisprava.cz.