Introduction

It is April, you hear colleagues talk about "déclaration d'impôts" and you wonder: "I arrived last September, does this concern me? And if I declare in France, what about the income I had in my home country? Will I pay tax twice?"

The confusion is universal, and it costs you real money if you ignore it. Failing to file as a French tax resident triggers a 10% minimum penalty plus 0.2%/month of interest. On the other hand, declaring in France income that has already been taxed at home without using the bilateral tax treaty means you ruin yourself for nothing. Here is the practical 2026 guide for income earned in 2025.

Who must file in France?

The key rule: it is tax residence, not nationality, that creates the obligation. You are a French tax resident in 2025 if at least one of these criteria is met:

1. Main household (close family — spouse and children — lives in France) OR main place of stay (you spend more than 183 days a year in France, even split into several stays)
2. Main professional activity carried out in France (unless it is accessory)
3. Centre of economic interests: most of your income, real-estate or bank accounts are in France

You are a French tax resident → you declare ALL your worldwide income to the French tax office. Not just the salary received in France.

Common 2026 cases:

• Mei, a Chinese student in Strasbourg since September 2025, on a Chinese government scholarship (CSC): main household officially still in China, stay < 183 days in 2025 → non-resident for 2025. But in 2026 she becomes a French tax resident.
• Karim, a Tunisian engineer who arrived in July 2025 with a Passeport Talent and his family: household + activity in France → tax resident from arrival, even though under 183 days in 2025.

If you arrive partway through the year, you declare in France the income earned from your installation date onward. Income earned before arrival is reported only for information in some cases and remains taxed in the country of origin.

Tax treaties: do not pay twice

France has signed bilateral treaties against double taxation with around 130 countries. For diasporas active on Pionra, the main treaties in force in 2026:

In practice: you fill out form 2042 like everyone else, plus form 2047 ("revenus encaissés à l'étranger") to report income from your country of origin. The treaty tells the tax office whether taxation is exclusive (one country only) or shared with a tax credit.

Students: your situation is almost always simple

For most foreign students in 2026:

A little-known tip: even if you owe no tax because your income is too low, file anyway. Filing produces a tax notice (avis d'imposition, or avis de non-imposition), required for: opening a Livret A, claiming CAF benefits, applying for a scholarship, proving income for the Visale guarantee, applying for CSS (Complémentaire Santé Solidaire), entering Sciences Po, etc.

The 2026 calendar: do not miss it

Income earned in 2025 → file between April and June 2026:

• Online service opens on impots.gouv.fr: mid-April 2026 (usually around April 11)
• Paper filing deadline: (around May 22)

For your very first return, you must file on paper (form 2042 + 2047 if you have foreign income), because you do not yet have a tax number for the online portal. You send it to the Service des Impôts des Particuliers (SIP) that covers your French address.

Once your first return is processed, you receive within 3 to 5 months your tax number and a password for the impots.gouv.fr account. From the next year onward, everything is online.

Where to get free help

The French return is intimidating, but free help is everywhere:

• Maison France Services (2,700 locations across France in 2026): an officer helps you fill in your return for free. Find the closest one: francesservices.gouv.fr.
• DGFiP walk-in slots in April-May: your SIP organises free appointments (online or in person) for first-time filers. impots.gouv.fr → "contact" → "prendre rendez-vous".
• (UNEF, FAGE): free help desks in universities in May.

Aïcha, a Moroccan student doing a master's in Toulouse, walked into the Maison France Services on rue de Bayard in May 2025. An hour and a half later, her first return had been mailed for free with a receipt. She received her tax number in September.

Quick comparison: file or not?

In short

• Tax resident = 183 days OR household OR main activity in France
• Resident → declare all worldwide income
• Tax treaties: China, Maghreb, Senegal, Vietnam, Portugal, India, Brazil, US — all prevent double taxation

On Pionra

On Pionra, the Chinese, Moroccan and Vietnamese communities share their tax-return experiences, bilingual accountants, and treaty-by-treaty traps. Find a bilingual chartered accountant in /fr/annuaire, or ask specific questions to your community (Algerian, , ).

FAQ

I have savings on an account in China, do I have to declare it?

Yes. Every French tax resident must declare each foreign bank account, even dormant, on form 3916 / 3916-bis attached to the return. The balance itself is not taxed, but forgetting costs 1,500 € per undeclared account (10,000 € if the country is considered non-cooperative — China is not).

My parents in Morocco send me 300 €/month for support, is that taxable?

No. Family gifts to a student (child, young adult) are not considered taxable income in France within the reasonable scope of daily needs. Above 31,865 € over 15 years (manual gift from a parent to an adult child), you must declare it as a gift, but not as income.

I am a Chinese PhD student with a CSC scholarship of 1,350 €/month. Taxable?

No. The CSC (China Scholarship Council) scholarship is exempt from French income tax under the official tax doctrine (BOI-RSA-CHAMP-20-30-10-20), provided it is not the consideration for salaried research. You must still report its existence in the "other tax-exempt income" box (box 1AC of form 2042) so it is included in your reference fiscal income (used for CAF, CSS, etc.).

I had no French income in 2025, just a Moroccan scholarship — must I file?

Not strictly required. But filing "0 €" is strongly recommended: it generates an avis de non-imposition, a precious document for CAF, CROUS, AME/CSS. File on paper the first year, then online from year 2.

My employer already withholds tax on my salary (PAS), do I still need to file?

Yes, always. The prélèvement à la source (PAS) is a prepayment based on the previous year. The April-June filing serves to reconcile: add income your employer cannot know about (interest, rent, foreign income), claim tax credits (real expenses, charitable donations, childcare), and compute the actual balance. Not filing = treated as a presumed fraudster, almost automatic reassessment.