Tax deadlines
The filing deadline for the tax return depends on the canton, in Aargau usually 31 March. Deadline extensions are possible; we file them on request as a paid additional service, so no reminder lands in your mailbox.
Tax deadlines (Steuerfristen) are the dates by which you must file your tax return and settle amounts due. In Switzerland these are largely set by each canton, so they differ from place to place, in Aargau the ordinary deadline for private individuals is usually 31 March. Extensions are widely available, and missing a deadline without one can trigger reminders, late-filing penalties or a discretionary assessment.
Example: An Aargau couple cannot gather all their documents by 31 March. Their fiduciary requests a deadline extension to 30 September online, so they avoid any reminder fee and have time to collect the pillar 3a and securities statements.
About the glossary
When is the tax return due in Switzerland?
It depends on the canton. For private individuals the typical deadline is 31 March of the following year, for example in Aargau — while legal entities file based on their financial year-end. Always check your own canton's date.
Can I get an extension for my Swiss tax return?
Yes. Most cantons grant extensions on request, often online and sometimes automatically, frequently until autumn. Applying before the original deadline avoids reminders and penalties.