The tax regulation in France has recently changed. As of January 2019, your income taxe should be paid directly by your employer. You should nevertheless declare your income. If you do this for the first time, file form 2042. For declaration year 2019, this form will become available on April 24 and needs to be submitted before May 16. You should receive a response containing among others your “numéro fiscal” which you can use to file taxes online the following years.
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You need to declare the income you received in 2017 before May 17th 2018. Declaring your income does not mean you will necessarily have to pay the income tax.
You can download the declaration form on impots.gouv.fr or get it in your local tax office (service des impôts des particuliers, also called SIP).
After you filled in the form you will have to send it back to your local tax office or to the service des impôts des particuliers non-résidents if you left France.
Address: Service des impôts des particuliers non-résidents 10, rue du Centre TSA 10010 93465 NOISY-LE-GRAND Cedex Tel: 01 57 33 83 00 Email: firstname.lastname@example.org