How to File Your First French Income Tax Return as an American Expat

Filing a French income tax return for the first time as an American is less complicated than France’s bureaucratic reputation suggests, but it requires learning a system built on entirely different assumptions than the IRS. The forms are unfamiliar. Your US-source income must be declared in a specific way before it lands on the main return. The filing deadline depends on the department where you live. And you cannot access the online portal at all until you have a numéro fiscal, which is not automatically assigned to Americans arriving from abroad. This article walks through each of those steps in sequence: who triggers French tax residency, how to get your tax identification number, which forms apply to your situation, how to declare your US income correctly, and what to expect if this is your first year filing on paper. This article is for informational purposes only and does not constitute tax or legal advice. Tax rules are complex and change frequently: consult a qualified cross-border tax professional before making any filing or planning decisions.

Who Has to File a French Income Tax Return

French tax residency is not optional or based on citizenship. It is triggered automatically by your circumstances, and once triggered, it requires you to declare your worldwide income to the French tax authorities every year, regardless of whether you also file US taxes.

Under article 4 B of the French General Tax Code, you have your tax domicile in France if your home or main place of stay is in France, if you work in France (unless the work is incidental), or if the centre of your economic interests is in France. One test is enough. The tests, the official pages that state them and the year of arrival are set out in the guide to French tax residency for Americans.

Article 4B is the French half of the test, not the whole of it. If you also count as a US resident under US rules, for instance because you kept a home there and spent substantial time in it, both countries claim you at once, and that conflict is settled by the residence article of the US-France tax treaty, which overrides Article 4B. The treaty’s tie-breaker tests, starting with where your permanent home is and where your personal and economic ties are closest, decide which country you are resident in for treaty purposes, and that answer prevails over the domestic criteria. For a settled move it usually confirms French residency. For a snowbird, a trailing spouse, or someone still working from a US base for part of the year, it is the treaty test, not Article 4B alone, that decides.

A signed lease and children enrolled in a French school bear on the home test: service-public describes your household as you, your spouse or partner and your children, and the home as the place where that household usually lives. Where you work and where your economic interests lie are separate tests.

What this means in practical terms: you are required to declare your worldwide income on a French tax return each spring, covering the prior calendar year. France and the United States both use the calendar year as the tax year, which makes the timing relatively clean. Your first French return, typically covering the year you arrived, will generally reflect only your period of French residency, not the full year if you arrived mid-year.

One important edge case: Americans who have not triggered French residency but who receive French-source income, for example from a French rental property owned while still living in the US, are required to file as non-residents. The process for non-resident filers is different and handled through the Service des Impôts des Particuliers de Non-Résidents (SIPNR). If that describes your situation, the rest of this article covers resident filing, and you should contact the SIPNR directly or consult a cross-border tax advisor.

What we see most often among Americans who trigger French residency mid-year is a genuine uncertainty about whether they need to file at all. The assumption is often: “I arrived in October, I only had French income for a few weeks, surely I don’t need to file a full return.” That assumption is incorrect. If you were a French tax resident for any part of the calendar year and had income of any kind during that period, including US income received while you were already resident in France, you are required to file.

French residency starts on a date, not on the day you decided to move, and that date decides how much US income belongs on this return. Fix the start date before you file.

Owning property in France creates obligations of its own even when none of these residency tests applies, including an annual occupancy declaration, and those are set out in our guide to the property taxes that follow the building rather than the owner.

How to Get Your Numéro Fiscal Before You Can File

Your numéro fiscal is your French tax identification number. It is a 13-digit number that identifies you permanently with the French tax administration and is required to access the impots.gouv.fr online portal, sign documents with the tax office, and receive any correspondence from the Direction Générale des Finances Publiques (DGFiP).

If you were employed by a French company, your employer will generally have registered you and your numéro fiscal will appear on your pay slips and on any tax documentation sent to you. If you are self-employed, a retiree, a remote worker receiving income from a non-French employer, or a dependent spouse, you may not have been assigned one automatically.

In that case, the most direct path is to contact the Service des Impôts des Particuliers (SIP) responsible for your French address. Every commune in France is served by a specific SIP. You can locate yours using the locator tool on impots.gouv.fr. Go in person or call and explain that you are a new arrival and need to be registered as a tax filer. Bring your passport, proof of French address (a signed lease, utility bill, or attestation de domicile), and your visa or residence permit. In some cases, SIPs will respond within a few days; in others, particularly in larger cities, it can take two to three weeks for your number to be confirmed in the system.

The numéro fiscal also appears on any avis d’imposition (tax assessment notice) you receive. If you have previously paid any French taxes, such as the taxe d’habitation before it was abolished for primary residences, you may already have a number on file.

In our experience, Americans who skip this step and try to create an online account at impots.gouv.fr without a numéro fiscal hit a hard wall. If you have received no letter from the tax administration, you cannot create your online space on your own: you give your civil status, a postal address and a copy of an identity document to your Centre des Finances Publiques, at the counter or by post, and once your identity is verified you receive an email to create your space with your numéro fiscal and date of birth. The online access number and reference tax income are for those who have already filed on paper. Paper (form 2042) is for those who cannot file online.

The Three Forms Most Americans Need: 2042, 2047 and 3916

Form 3916 requires you to declare every account you hold outside France, which for Americans means your US accounts, and not the French accounts you open once you arrive, because the French tax administration only asks about accounts opened, held, used, or closed abroad (DGFiP guidance on declaring accounts held abroad). Our guide to opening a French bank account under FATCA explains the dual reporting obligations: what the French tax authority requires on Form 3916 and what the IRS requires separately through FBAR and Form 8938.

French income tax filing uses a modular form system. The main return is Form 2042, the equivalent of the US Form 1040. It captures your French-source income and summarizes the figures from supplementary forms. But for Americans with US-source income, two additional forms are almost always required alongside it.

Form 2047 is the declaration of foreign-source income. For US pensions and Social Security, who taxes them and where the French tax office says to report them is set out with the treaty articles. This is the form that trips up the most first-time American filers, because many assume they only need to declare income earned in France and that their US income is covered by their IRS return. That is incorrect. If you are a French tax resident, you must declare your worldwide income on the French return, and Form 2047 is where foreign income enters the system. It captures income by category (wages, dividends, capital gains, pensions, rental income) and indicates the applicable treaty treatment. The totals from Form 2047 are then transferred to the corresponding lines on Form 2042.

Form 3916 is the declaration of foreign bank accounts. French residents are required to declare every foreign bank account they hold, including US checking accounts, savings accounts, brokerage accounts, and retirement accounts such as IRAs and 401(k)s (with some nuance around retirement accounts depending on treaty provisions). Form 3916 is filed alongside your tax return each year. This is a separate requirement from the US FBAR and FATCA obligations covered in our article on how FBAR and FATCA work for American residents in France. Both the French and US requirements apply independently, and missing the French account declaration can result in significant penalties.

Beyond these three, some Americans will also need Form 2042-C PRO if they have self-employment income or operate as a micro-entrepreneur in France, or Form 2044 if they have French rental income. These are not universal but are common enough to mention. If you are the settlor or trustee of a US revocable living trust, there is a further pair of forms outside the income tax return entirely, 2181-TRUST1 and 2181-TRUST2, explained in our guide to trust reporting obligations for Americans in France.

All French tax forms are available for free on impots.gouv.fr. You do not need to purchase software to file. The online portal offers a pre-filled return (déclaration pré-remplie) for established filers, but first-time filers typically start from a blank form.

How to Report Your US Income on a French Tax Return

This section is where the real complexity sits for American filers, and where mistakes are most costly.

France and the United States have a bilateral tax treaty designed to prevent double taxation. Under the treaty, most categories of income are not taxed twice in a straightforward cash sense. However, the mechanism varies by income type, and the French and US treatments interact in ways that are not intuitive.

Wages are taxed where the work is physically done, not where the employer sits. If you work remotely from France for a US employer, that salary is French-source employment income under the treaty and it is taxable in France in full, entered as ordinary wages on Form 2042. The French side does not stop at your return either: the income tax on a salary paid from abroad is collected through installments (acomptes) that the tax administration debits from your bank account, calculated on the income you declared the year before, so budget for them from your first year; on the social security side an employee working from France can pull the US employer into the French system, with an obligation to register in France, issue French payslips and pay French social charges, so a remote arrangement should be set up with that in mind rather than discovered during an audit. The treaty’s exempt-with-credit treatment, known as the taux effectif method, applies only to wages for work physically performed in the United States, for example days spent working from a US office on a trip back. That income is still declared on the French return and counted in setting your rate, but a credit equal to the French tax cancels the tax itself, so it raises the bracket applied to your other income without adding a French bill of its own. What we see most often is the reverse assumption: that a US employer means US-source income and therefore no French tax. It is wrong, and it is expensive.

For US-source dividends, interest, and capital gains, the treaty is more generous to US citizens than most guides suggest. A US citizen resident in France receives a credit equal to the French tax on certain US-source dividends, interest and royalties, and on gains from the sale of the assets that produce them. The payer must be one of those listed in Article 24(1)(b) of the treaty (the US government or its subdivisions, a US company listed on a regulated market, a US company in which you hold under 10 percent of the votes and French residents under 50 percent, or a US resident with at most 25 percent of gross income from outside the US), and you must prove that you have met your US federal income tax obligations. Other US-source dividends, interest and gains get a credit for the US tax paid, capped at the French tax on them. The residual French tax that many articles warn about arises where those conditions are not met, on investment income that is not US-source, and on investment income received by a French resident who is not a US citizen, such as a green-card holder, who gets only a credit for the US withholding tax and pays the French balance plus social contributions. For rental income from US property, France grants all residents a credit equal to the French tax, so it too generally carries no French bill. US Social Security benefits are taxable only in the United States, but they are not simply left off the return: they are declared, a credit equal to the French tax cancels the tax on them, and they are counted in setting the rate applied to your other income, the taux effectif method again. That treatment must be properly claimed on Form 2047.

The mechanics of Form 2047 matter here. Income is entered by category, each category has a designated box, and the treaty treatment is indicated by entering the income in the correct section (taxable at taux effectif vs. taxable with crédit d’impôt). Getting the categories wrong, for example treating a US pension as regular wages, can result in double taxation you are not legally required to pay.

All US-dollar amounts must be converted to euros before entry. The notice of Form 2047 says that income received in a foreign currency is declared at its euro value, calculated at the exchange rate in Paris on the day it was received or credited to your account. The tax administration’s BOFiP (BOI-IR-BASE-10-10-10-10) also accepts, as a practical rule, converting the income received in a year at that year’s average rate of the currency, determined from the Banque de France rates.

US Social Security benefits received while living in France fall under Article 18(1) of the US-France income tax treaty, which makes them taxable only in the United States, and the treatment on your French return is not always intuitive. Our guide to the US-France Social Security totalization agreement explains exactly how this income is declared in France and whether it is taxable there.

In our experience, American retirees in France are particularly prone to errors on Form 2047, because their income may span several categories, including Social Security (declared, taxed only in the US, but counted for the rate), a traditional IRA distribution (treaty treatment varies), and US dividend income (declared, and for a US citizen cancelled by the credit equal to French tax when the conditions of Article 24 are met). Each of these lines belongs in a different section of Form 2047. Grouping them together in the wrong place is one of the most consistent mistakes we see. Filing a French return does not eliminate your US exposure our guide to using the Foreign Tax Credit (Form 1116) to avoid double taxation as an American in France explains how to apply the credit correctly against your French tax. The French tax return for self-employed Americans and freelancers involves additional declarations beyond employment income, and US self-employment tax still applies on top. Our guide to self-employment taxes for Americans freelancing in France covers what you owe France, what you still owe the IRS, and how the US-France totalization agreement affects your situation.

If you sold a US property in the tax year you are filing, the treatment on your French return differs significantly from a standard US source. Our guide to the tax implications of selling a US home after moving to France covers how the gain is calculated for French purposes, what the US-France treaty provides, and how to coordinate reporting across both returns.

French Tax Filing Deadlines by Department

France does not use a single national filing deadline. The filing calendar is staggered by department number, which means your deadline depends on where you live.

For the spring 2026 filing season (covering 2025 income), the general structure is:

Paper returns have a single national deadline, typically in mid-May. For 2026, the date was May 19, as published on impots.gouv.fr, and it shifts slightly each year. First-time filers who must submit on paper need to be aware that this deadline is earlier than the online deadlines and leaves less time than many Americans expect.

Online filing is staggered into three zones based on department number:

Zone 1 covers departments 01 through 19, plus non-residents who do not live in France. Online deadline is typically in late May: for the 2026 campaign it was May 21. France’s overseas departments are not in Zone 1: they fall in Zone 3 (departments 55 to 974 and 976), as confirmed on the official impots.gouv.fr filing deadline page.

Zone 2 covers departments 20 through 54. Online deadline is typically in late May: for the 2026 campaign it was May 28.

Zone 3 covers departments 55 to 974 and 976. Online deadline is typically in early June: for the 2026 campaign it was June 4, as published on the impots.gouv.fr filing deadline page.

Source: impots.gouv.fr, filing deadline for the income tax return.

Paris is department 75, which places it in Zone 3 for online filers. Lyon (department 69) is also in Zone 3. Marseille (department 13) is in Zone 1. Bordeaux (department 33) is in Zone 2. Toulouse (department 31) is in Zone 2. Strasbourg (department 67) is in Zone 3.

The paper deadline catches Americans off guard every year. Many assume they have until the online deadline to submit, especially if they are familiar with the US system where paper and electronic deadlines are the same. In France, paper filers have less time, and the deadline is firm. If you know you will need to file on paper for your first year, plan to complete the form by early May to allow time for mailing.

Late filing results in a surcharge (majoration) of 10% of the tax due. If the tax authority sends a formal notice (mise en demeure), the surcharge rises to 20% when you file within 30 days of it, and to 40% when the return is not filed within 30 days of it. There is no grace period equivalent to the US automatic six-month extension.

First-Time Filer: Paper Form or Online Portal

Paper (form 2042) is for those who cannot file online. If you have never received anything from the French tax administration, you can have your identity checked at your Centre des Finances Publiques, at the counter or by post, and you are then sent what you need to create your space using your numéro fiscal and your date of birth, as set out on the DGFiP page on filing your first return online. No French mobile number is involved at any stage.

Paper Form 2042, along with Form 2047 and Form 3916 if applicable, can be downloaded from impots.gouv.fr or obtained in person at the Centre des Finances Publiques nearest to your address. The completed forms are mailed to the SIP covering your French address. Include all supplementary forms in the same envelope, and keep a copy of everything you send.

After you have filed a paper return, you create your online space yourself on impots.gouv.fr with your numéro fiscal, the online access number printed on the declaration you receive in April and your reference tax income from your last tax notice. You can then file online, and you will receive a pre-filled return (déclaration pré-remplie) that reflects data already held by the French tax administration from employers, pension payers, and French financial institutions. You review the pre-filled data, add any missing income (typically your US-source income, which will not be pre-filled), and submit.

One practical detail that matters: when submitting on paper, French tax authorities do not send a confirmation of receipt. Americans accustomed to electronic acknowledgment from the IRS often assume the silence means something went wrong. It does not. If you sent the forms by registered mail (lettre recommandée avec accusé de réception), your postal receipt is your proof of timely filing. Keep it.

French Income Tax Rates and What Americans Can Actually Expect to Owe

French income tax uses a progressive scale (barème progressif) with five brackets. Unlike the US system, where each dollar of income in a given bracket is taxed at that rate, the French system also applies the household’s quotient familial, which divides total household income by the number of “parts” before calculating the tax, then multiplies back. A single person has one part. A married couple or PACSed partners have two parts. Each of the first two dependent children adds half a part. Additional dependents add more.

The approximate income tax brackets for 2025 income (filed in spring 2026) are as follows, expressed per part of the quotient familial:

0% on income up to 11,600 euros per part. 11% on income from 11,600 to 29,579 euros per part. 30% on income from 29,579 to 84,577 euros per part. 41% on income from 84,577 to 181,917 euros per part. 45% on income above 181,917 euros per part, per the official barème published by the French tax administration.

These figures are approximate and rounded for readability. Verify the exact bands for the current tax year on impots.gouv.fr before filing, as the brackets are adjusted each year for inflation.

For a single American with income equivalent to roughly 50,000 euros per year (one part), the effective French income tax rate tends to be in the 10% to 18% range before credits, which is meaningfully lower than what the equivalent income would face at the US marginal rate. However, the calculation shifts significantly once treaty credits, social contribution obligations, and the composition of the household are factored in.

Note that income tax (impôt sur le revenu) is not the only French tax on income. Prélèvements sociaux (social contributions, including CSG and CRDS) are levied separately on most categories of income. Since 1 January 2026 the combined rate on dividends, interest, and capital gains on securities is 18.6%, up from 17.2%, after the 2026 social security financing law raised the CSG on those categories; the 17.2% rate still applies to rental income, real estate gains, and assurance-vie. For a US citizen, the treaty credit described above removes both the income tax and the social contributions on US-source investment income, so the rate matters mainly for French or other non-US investment income, and for residents who are not US citizens. Model both obligations before assuming the French tax cost is low.

For Americans planning their retirement in France, understanding the interaction between the barème, the quotient familial, Social Security treaty exemptions, and prélèvements sociaux is especially important, because the effective rate on a retirement portfolio can look very different from the headline bracket.

French income taxes paid can generally be credited against your US tax liability, which is the mechanism that prevents actual double taxation. Our guide to the foreign tax credit Form 1116 for Americans in France explains the income basket rules, the limitation calculation, and the most common errors that reduce the credit. Errors here are quiet and expensive, and a consulting call gives you the calendar and the checklist before you sit down with any advisor.

Before using the official calculator to estimate that figure, be aware that it computes tax for residents of France only and has no field for treaty relief on US income: see which French government simulators work for Americans and which refuse you.

Common Mistakes to Avoid

Not filing at all is the most serious mistake Americans make. In our experience, a meaningful share of Americans living in France either do not know they need to file a French return or assume that their continued IRS filing covers their obligations. It does not. Once you are a French tax resident, you have a legal obligation to file with the French tax authorities each year, independent of your US filing obligations.

Filing only Form 2042 and omitting Form 2047 is the most common technical mistake among Americans who do attempt to file. The assumption is that foreign income “doesn’t count” for the French return because it’s already taxed by the IRS. That is not how the system works. Undeclared foreign income that later comes to the attention of the French tax administration, for example through automatic exchange of financial information under the CRS framework, is treated as deliberate omission and carries significant penalties.

Failing to declare US bank accounts on Form 3916 is similarly common. Americans often conflate the French requirement with the US FBAR and assume that filing FBAR covers their French obligation. These are two separate filings with two separate authorities under two separate legal frameworks.

What we see most often with the currency conversion is Americans using a convenient rate they found online, such as a year-end spot rate from a financial data provider, instead of the exchange rate in Paris on the day each amount was received, which the notice of Form 2047 asks for. The difference is usually modest, but it creates a discrepancy that can trigger a correction notice (proposition de rectification) from the tax office.

Not converting properly is one thing; not converting at all is another. We have seen American filers enter US dollar amounts directly into French tax forms without conversion. The forms expect euros. A dollar figure entered without conversion will appear as euros in the system, systematically understating your declared income at current exchange rates.

Missing the paper deadline is specific to first-time filers who cannot yet access the online portal. The paper deadline is earlier than the online deadlines: for the 2026 campaign it was May 19, against May 21, May 28 and June 4 online. If you realize in late May that you needed to file on paper and missed the date, the 10% surcharge applies immediately. File as soon as possible regardless: the penalty for late filing is lower than the penalty for non-filing, and proactive contact with the SIP often results in the surcharge being applied at the minimum rate.

Filing a French return does not resolve your US state tax obligations. Whether you still owe state income tax depends on whether you successfully broke state tax residency before leaving. Our guide to breaking US state tax residency when moving to France covers the domicile standard, which states are most aggressive, and the pre-move steps that protect you.

Practical Checklist

• Before you file your first French income tax return, work through this checklist:

• Confirm you are a French tax resident for the relevant tax year, and identify the period of residency if you arrived mid-year.

• Obtain your numéro fiscal by contacting your local SIP or checking whether it already appears on any French tax documents you have received.

• Determine which forms you need: Form 2042 for all filers, Form 2047 if you have any foreign-source income (virtually all Americans), Form 3916 for each foreign bank or financial account you hold, and any additional forms relevant to French-source income.

• Gather your income documentation: US W-2s, 1099s, Social Security statements, brokerage statements, pension statements, and any French income documents (bulletins de salaire, attestations fiscales from French employers or institutions).

• Convert all USD amounts to euros at the exchange rate in Paris on the day each amount was received or credited to your account.

• Identify the treaty treatment for each category of US income: taxable in France in full (wages for work done from France, even for a US employer), declared with a credit equal to the French tax so no French tax is due (US Social Security, US rental income, and for US citizens certain US-source dividends, interest, and capital gains), or taxable with a credit for US withholding only (investment income received by a resident who is not a US citizen, such as a green-card holder).

• Complete Form 2047 before Form 2042. The totals from 2047 flow into the relevant boxes on 2042.

• Complete Form 3916 for each foreign account. Each account is a separate form (or a separate line depending on the version of the form used in a given year).

• Confirm your filing deadline based on your department number. If you are filing on paper, the national paper deadline applies and is earlier than the online deadlines.

• If filing on paper, mail by registered letter (lettre recommandée avec accusé de réception) to the SIP covering your French address, and keep the postal receipt.

Filing in France does not close your US file. American citizens file both returns every year, and the French one you have just completed feeds directly into the American one: the income tax you paid here is what generates the foreign tax credit that usually reduces your US bill to zero. Keep your avis d’imposition, since it is the supporting document for that credit. Filing the US return with expat-specific software is the second half of the same annual exercise.

When to Get Help

Filing a French return with straightforward French employment income and no foreign accounts is manageable on your own once you understand the forms. If your income is limited to French wages, you receive a pre-filled return from the second year onward, and the process is relatively quick.

The picture changes significantly if you have US-source income of any kind, a US employer paying you while you work from France, US investment accounts, US rental properties, a 401(k) or IRA, Social Security income, or self-employment income from a US-registered business. Each of these introduces treaty interactions, form-level decisions, and potential prélèvements sociaux exposures that benefit from professional handling. Getting these wrong in year one creates corrections that compound in year two and beyond.

First-time filers who are unsure about their French tax residency status, unsure how to classify their US income under the treaty, or simply unfamiliar with the French form system benefit from structured support before the filing deadline. It gives you a structured review of your income profile, a document checklist organized by form, a filing calendar calibrated to your department, and guidance on how to handle your specific US income sources within the French return.

If your situation involves significant cross-border complexity, such as a brokerage portfolio generating capital gains in both countries, a US LLC or partnership, or US trusts, you should work with a qualified cross-border tax professional rather than attempting to file independently.

If this is your first French return and you are carrying a 401(k), US rental income, or Social Security alongside French wages, a review of your income profile by form is what turns that list into a filing order.

FAQ

Does an American living in France have to file both a US and a French income tax return?

Yes. The United States taxes its citizens on worldwide income regardless of where they live, so American expats in France are required to continue filing US federal returns with the IRS each year. At the same time, French tax residency creates an obligation to file a French return declaring worldwide income to the French tax administration. These are two separate obligations under two separate legal systems. The US-France tax treaty provides mechanisms to prevent double taxation, primarily through foreign tax credits and exemptions, but it does not eliminate the filing requirement for either country. Check your full US-side tax obligations as an American in France for a detailed breakdown of the US-side obligations.

What is Form 2047 and why do Americans need it?

Form 2047 is the French declaration of foreign-source income. For Americans who are French tax residents, it is the document that captures all income earned outside France before transferring the totals to the main Form 2042. You use it to declare US wages, US Social Security, US dividends, US capital gains, US rental income, and any other foreign-source income. Each income category has a designated section on the form, and the treaty treatment (exempt at taux effectif, or taxable with crédit d’impôt) is indicated by entering the income in the correct box. Omitting Form 2047 and filing only Form 2042 results in an incomplete return that understates your income and potentially your tax rate.

Can I file my first French income tax return online if I just arrived in France?

Generally yes, once your identity has been checked. If you have received nothing from the tax administration, you give your civil status, a postal address and a copy of an identity document to your Centre des Finances Publiques, at the counter or by post, and you then receive an email to create your space with your numéro fiscal and date of birth. If you have already filed on paper, you create your space with your numéro fiscal, your online access number and your reference tax income. Paper filing, with Forms 2042, 2047 and 3916 mailed to the SIP covering your address before the paper deadline, is for those who cannot file online.

How does the French tax deadline system work if I live in Paris vs. Lyon vs. Toulouse?

French online filing deadlines are divided into three zones based on department number, with the paper deadline applying earlier as a fixed national date. Paris (department 75) and Lyon (department 69) are both in Zone 3, the latest online filing wave, with an online deadline typically in early June. Marseille (department 13) is in Zone 1 with an online deadline typically in late May. Toulouse (department 31) is in Zone 2. The paper deadline for all departments is typically in mid-May, ahead of the online deadlines: in 2026 it was May 19, against June 4 for the last online deadline. If you are a first-time filer who must submit on paper, check the exact paper deadline for the current year on impots.gouv.fr as early as possible, as it is typically announced in April and does not leave much time once announced. Exact dates shift by a few days each year.

Do I need to declare my US 401(k) or IRA on my French tax return?

The treatment of US retirement accounts under the US-France tax treaty is one of the more nuanced areas of cross-border tax planning. Under the treaty, contributions to and growth within US qualified retirement plans such as 401(k)s and traditional IRAs are generally not subject to French tax while the funds remain in the account. However, article 18 of the tax treaty as amended in 2009 makes payments from a US retirement plan, paid in respect of past employment, taxable only in the United States: France counts them to set your tax rate and grants a credit equal to the French tax on them (article 24). Whether an account you funded yourself, such as an IRA, falls under that article is a question to settle with your advisor. The accounts themselves must be declared on Form 3916 each year as foreign financial accounts, even if no distribution was taken. Roth IRA treatment has historically been a particular grey area due to its tax-exempt status in the US not having a direct French equivalent. Consult a qualified cross-border tax advisor to confirm the current treatment before assuming your retirement accounts are straightforward.

Conclusion

Your first French income tax return involves more moving parts than most Americans expect, specifically because US-source income must be actively declared on Form 2047, the filing deadline varies by where you live in France, and first-time filers have to have their identity checked before they can access the online portal. The process is manageable once you understand the structure, but the cost of getting it wrong, whether through missing the paper deadline, omitting foreign income, or misclassifying income under the treaty, is high enough to justify investing time in getting it right from year one. Americans receiving US Social Security while resident in France face a specific treaty question see our guide to US Social Security benefits and the France Totalization Agreement.

If you want a structured starting point before you sit down with any advisor, a consulting call gives you the filing calendar and the document checklist so the paid help starts from an organized file. It is designed specifically for Americans in their first or second year of French tax residency, when the system is least familiar and the stakes of a filing error are highest.