Guide
Deadlines
Tax deadlines cause uncertainty for many taxpayers, yet dealing with them can be planned well. This guide shows you the most important connections.
In brief
The deadline for filing the tax return is set by each canton itself and is usually scheduled in spring. An extension can generally be applied for online without complication, and there are also established procedures if you miss a deadline. If in doubt, always check the current guidelines of your canton.
What matters
Cantonal differences
Each canton sets its own filing deadline and its own procedure for deadline extensions. It is worth looking up the details directly with the cantonal tax administration.
Deadline extensions are common
An extension of the filing deadline is possible in practically all cantons and is often granted free of charge or for a small fee. The application should be submitted early.
Be aware of the reminder procedure
If a deadline is missed, a reminder with a grace period usually follows first. Only after that do further consequences such as a discretionary assessment become a threat.
Electronic deadline management
Many cantons offer online portals through which deadline extensions and submissions can be recorded directly in digital form. This makes it easier to complete everything on time.
Articles on Deadlines
3 articles with explanations, checklists and sources.
- Filing deadlines for the tax return in the cantonsThe deadline for filing the tax return is set individually by each canton and usually falls in spring, often between the end of March and the end of April. The guidelines of the canton in which you are liable to tax are always decisive, as the exact dates are communicated anew each year.Read article
- Missed the tax deadline: what you should do nowAnyone who misses the filing deadline usually first receives a reminder from the tax administration with a short grace period. If this is not met either, an assessment based on due discretion may be made, often combined with a disciplinary fine. It is best to file the return as quickly as possible, even if the deadline has already passed.Read article
- Applying for a deadline extension for the tax returnIn most cantons, a deadline extension for the tax return can be applied for easily online or in writing, ideally before the original deadline expires. Depending on the canton, a first extension is free of charge, while further postponements are sometimes subject to a fee. It is important to submit the application in good time and with the correct details.Read article
What you should keep in mind
- Know the original filing deadline of your canton
- Apply for a deadline extension early, not just before the deadline expires
- Do not ignore reminders from the tax administration
- Keep an eye on grace periods and any fees
- Collect documents for the tax return on an ongoing basis
- If you are unsure, contact the tax administration early
Frequently asked questions – Deadlines
Sources and related topics
Sources
Updated: August 2026 · General information, not individual tax advice.
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