Can't file your tax return by 31 March 2027? You can extend the deadline with a simple notice to the tax office – by three months, or by up to six if you had foreign income. You fill in a few details and download the finished notice: an XML file for filing via the Financial Administration portal and the completed form as a PDF. Free of charge, no registration.
For 2026, from 1 January to 31 March 2027. After 31 March, the deadline can no longer be extended. You do not give a reason and the tax office does not approve the notice – filing it on time is enough.
By the new deadline you must file the return and pay the tax. A sole trader registered for income tax and a company entered in the commercial register file the notice only electronically.
The notice is filed by whoever files the income tax return – an individual (employee, sole trader, landlord, investor) or a legal entity (s. r. o., a. s., cooperative, association).
The tax period is usually the calendar year (1. 1. – 31. 12. 2026). If the company has a financial year or was established or dissolved during the year, enter its actual period.
The notice cannot be filed by a company in bankruptcy or liquidation – the tax office will extend its deadline only on request filed at least 15 days before the deadline ends. The same applies to an heir filing a return on behalf of a deceased person.
Fill them in the same way as in the tax return. If you have a DIČ, the DIČ is enough – the birth number or IČO is then not needed.
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The new deadline is the end of the month in which you will file the return – and in which you will also pay the tax. If you file the return earlier, that is fine.
For employees – wages, children, mortgage, 3rd pillar. You see the tax and the refund straight away, PDF and XML for filing.
For sole traders with flat-rate expenses or tax records, rental, shares, ETFs, crypto and foreign dividends. With expense calculators.
We will prepare the return of an individual or of a legal entity with financial statements for you.
The income tax return for 2026 must be filed and the tax paid by 31 March 2027. You can extend the deadline yourself, without the tax office's approval: all you need to do is file a notice extending the deadline for filing the tax return under § 49 ods. 3 of the Income Tax Act with the tax office by 31 March 2027. You do not give a reason and you pay nothing.
The deadline can be extended by at most three full calendar months – to 30 April, 31 May or 30 June 2027. If you also had foreign income (wages, dividends, interest, sale of shares through a foreign broker), you can extend it by up to six months, i.e. to 30 September 2027 at the latest. The new deadline is always the end of a month, and by that day you must both file the return and pay the tax. The same applies to legal entities; with a financial year, the deadline is counted from its end.
Sole traders and other entrepreneurs registered for income tax, as well as companies entered in the commercial register, must file the notice electronically – the tax office would not accept a paper notice. Everyone else (employees, landlords, investors without a trade licence) can also send it by post or take it to the filing office. The notice for 2026 can be filed no earlier than 1 January 2027.
The notice cannot be filed by a taxpayer in bankruptcy or liquidation, nor by an heir on behalf of a deceased person – for them, the tax office can extend the deadline on request filed no later than 15 days before the deadline ends. If you made a mistake in the notice or change your mind, file a new notice marked as a correction by 31 March.
No later than the last day of the regular deadline for filing the return – for 2026, by 31 March 2027. You can file it from 1 January 2027. A notice filed after 31 March does not extend the deadline.
By at most three full calendar months, i.e. until 30 June 2027. If you had foreign income, by at most six months – until 30 September 2027. You choose the new deadline yourself, always as the end of a month.
Yes. You pay the tax only by the new deadline you state in the notice. If you are due a refund, the tax office will pay it within 40 days of the end of the new deadline – so extending the deadline rarely pays off when you expect a refund.
Yes, if you are an entrepreneur registered for income tax (for example, a sole trader) or a company entered in the commercial register. You load the XML file from this page into the form on the Financial Administration portal and file it using your ID card with a chip or under an agreement on electronic delivery. If you do not run a business, you can file the printed and signed PDF by post or in person.
No. The deadline is extended simply by filing the notice on time. The tax office does not approve or send anything – the proof is the filing confirmation from the portal or the filing stamp.
No. Your data is remembered only by your browser so that you can come back to it; you can delete it with the Clear data button. It reaches us only briefly while we generate the XML and PDF, and is discarded straight away.
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