Tax deadlines in Basel-Stadt
Need to file your tax return in the Canton of Basel-Stadt? Get a complete overview of deadlines, how to request extensions, and the implications of late submission.
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In the Canton of Basel-Stadt, our tax service takes care of your return from start to finish — filing on time, requesting extensions, verifying documents, and maximizing deductions. Easy, hassle-free, and dependable.
Ordinary tax deadlines
In the Canton of Basel-Stadt, the following tax filing deadlines apply:
- Private individuals: by March 31
- Companies: by June 30
The deadlines refer to the tax year completed in the previous year.
Request deadline extension & maximum deadlines
If you cannot submit your tax return on time in the Canton of Basel-Stadt, you have the option to request a deadline extension from the tax office. The application can be submitted online or in writing – applicable for both private individuals and companies. The maximum extension applies until:
- Private individuals: December 31
- Companies: December 31
Note: Depending on the canton, fees may be charged for deadline extensions.
Good to know: When ordering through Taxea.ch, the deadline extension is automatically included. You don’t need to do anything – we take care of this step for you.
What happens if you file your tax return late?
If the tax return in the Canton of Basel-Stadt is submitted late without a deadline extension, the following consequences may occur:
- The tax office issues a reminder
- Reminder fees or fines may be imposed
- In certain cases, a discretionary assessment may be carried out
To avoid unnecessary costs and effort, it is recommended to submit your tax return on time or use our service.
Different deadlines for special cases
Depending on your situation, different deadlines and specific tax rules may apply. For example, this may be the case in situations such as:
- Moving to Switzerland from abroad
- Moving from Switzerland to another country
- Death during the tax year
- Starting or ending self-employment
- Establishing, restructuring, or liquidating a company
In such cases, it is advisable to clarify with the relevant tax authority directly or seek support from a tax specialist to ensure compliance with deadlines and obligations.
Frequently asked questions about tax deadlines in Basel-Stadt
Below you will find answers to the most important questions about tax deadlines in the Canton of Basel-Stadt.
What are the deadlines for filing a tax return in the canton of Basel-Stadt?
Tax returns must be filed by March 31 for private individuals and by June 30 for companies. You can request a deadline extension if needed.
How do I request an extension of the deadline?
The application can be submitted online or in writing to the Canton of Basel-Stadt tax office. When you book through Taxea.ch, we handle the extension automatically for you.
Do I have to file a tax return in Basel-Stadt every year?
Yes, all taxable persons and companies in the Canton of Basel-Stadt are required to file a tax return every year.
What happens if I file my tax return late or not at all?
In such cases, the tax office sends reminders, collects fees or fines and can carry out a discretionary assessment.
Can I also apply for an extension of the deadline if I move away?
You can always request a deadline extension, even when relocating from the Canton of Basel-Stadt. Just make sure to inform the tax office in advance.
