TLDR: French tax residents who earn a salary in Switzerland must declare it in France. Switzerland applies withholding tax, while France grants a tax credit to avoid double taxation. You must have a French tax number and file your return online or on paper, attaching the Swiss salary certificate.
Who Must Declare Swiss Salary
French tax residents working in Switzerland outside the cross-border worker regime must declare their salary in France. Switzerland applies withholding tax, while France grants a tax credit to avoid double taxation. The tax credit cannot exceed the amount of Swiss tax actually paid.
Tax Number and Preliminary Documents
To declare a Swiss salary in France, you must have a French tax number (numéro SPI), which allows access to the impots.gouv.fr portal for online declarations. The number is automatically assigned upon first contact with the French tax administration.
Declaration Procedure
Online Declaration
Online declaration is the most common and convenient method for reporting Swiss salary. You must log in to the impots.gouv.fr portal using your French tax number (numéro SPI).
Paper Declaration
In the first two years of employment, you must submit form 2041-AS along with your income tax return. From the third year onward, you must attach the salary certificate issued by your Swiss employer to the paper return.
Documents and Information to Provide
Mandatory Documents
- Salary Certificate (Certificat de salaires): Issued by the Swiss employer, it must be attached to the paper return from the second year of employment or kept for online declarations. The document shows the gross salary in Swiss francs.
Information to Declare
- Gross salary in Swiss francs: Enter directly in the form, with no need for conversion to euros.
- Swiss employer details: If required by the form.
- Tax credits: For income taxed in both Switzerland and France, the credit is automatically calculated by the French administration based on the provided information.
Deadlines and Corrections
The deadlines for filing income tax returns are not specified in official sources. However, the general obligation requires annual filing, with the required documents attached (salary certificate or residence attestation). Corrections can be made by submitting an amended return, though terms and procedures are not explicitly stated.