How to request a deadline extension for your tax return.
In Switzerland, filing an annual tax return is mandatory, but the deadline doesn't always work for everyone. Those who haven't gathered all the necessary documents or who simply don't have time in their busy lives risk incurring late fees or fines.
The solution? A deadline extension. An extension gives you extra time and protects you from unpleasant consequences. 
Why a deadline extension makes sense
Most cantons set an initial deadline for submitting tax returns at the end of March or April. If the return is not submitted by then, the taxpayer will receive reminders and late fees. In the worst case, the tax office will perform a discretionary assessment, which often results in a financial loss for the taxpayer.
This can easily be avoided by requesting an extension, which tax offices usually grant for three to six months. This additional time can be crucial for obtaining missing documents, accurately recording complex life situations, or simply taking a moment to gather the necessary paperwork.
How to request a deadline extension
Each canton has its own regulations for extending deadlines. In most cases, extensions can be requested online, by telephone, or in writing. The process is usually straightforward, but there are clear deadlines. If you forget to request an extension, you will usually not have the opportunity to do so later.
Additionally, individuals who have moved residences several times, work abroad, or own residential property typically have more complex tax documents. These documents require more time and expertise, both of which are provided by the deadline extension.
Two ways to extend your tax deadline: your choice
Tax return with Taxea.ch – deadline extension included
When you prepare your tax return with Taxea.ch, the filing deadline extension is automatically included – always until the maximum possible date in your canton of residence.
Whether you live in Zurich, Geneva, Basel, or a smaller municipality, we handle everything for you – digital, reliable, and complete. You don’t have to worry about deadlines, forms, or phone calls. We make sure you get the best possible tax outcome.
Do it yourself
You apply for the deadline extension directly with the tax office of your canton of residence. In many cantons, this is possible online – via forms or PDF templates on the respective website – but the process remains tedious and error-prone.
Responsibilities, deadlines, and forms differ depending on the canton. If you do not submit correctly or on time, you risk reminder fees, fines, or even an estimated tax assessment.
We make sure you never miss a deadline.
A deadline extension isn’t an exception – it’s a smart way to submit your tax return carefully and without stress. With Taxea.ch, you save time and gain security: we take care of the whole process for you – from the extension to electronic filing.
Do you have any questions?
If you have questions about deadline extensions or the proper filing of your tax return, we’re here to help. Our team supports you quickly, efficiently, and individually – so you never miss a deadline again.