US → France: American Expat Tax Guide for Living in France

Becoming a French Tax Resident

France's tax residency test (CGI Article 4 B) is one of the broadest in Europe. You are tax resident in France if any one of four tests is met: France is your foyer (home of your family), France is your principal place of stay, you carry on your main professional activity in France, or France is the center of your economic interests. Unlike the UK SRT or US substantial presence test, you do not need to count days — a single qualifying tie can be enough.

Once resident, France taxes worldwide income from the date you established residence. The fiscal year is the calendar year, and the impôt sur le revenu return (Form 2042 plus annexes) is due in May or early June with online filing. Social charges run on top of income tax and are not creditable in the US in all situations — the treatment of CSG and CRDS as creditable foreign taxes was finally resolved in the US's favor after Eshel v. Commissioner.

• Any one of four tests can make you French tax resident — foyer, principal stay, profession, or economic center.
• French tax year matches the calendar year; declaration filed in May/June.
• CSG and CRDS are now treated as creditable foreign taxes for US purposes after the 2019 IRS announcement.

The US-France Treaty: Where the Saving Clause Bites and Where It Doesn't

The US-France Income Tax Treaty (1994, with 2004 and 2009 protocols) is one of the most expat-friendly US treaties. Its saving clause is narrower than usual, and a meaningful list of articles survives it — including Article 18 on pensions and Article 24 on relief from double taxation. For most Americans in France, the treaty pushes employment income to French taxation, lets the US foreign tax credit zero out the US bill, and provides specific protection for US-source pensions and Social Security.

The treaty also coordinates social security via the US-France Totalization Agreement, so you generally pay social charges in only one country at a time. Read WO-UC01 for the general framework and WO-CR03 spokes (especially CS06 and CS07) for property and FEIE-versus-FTC mechanics.

FEIE vs FTC: France Is FTC Country

French marginal rates run from 0% to 45% on income tax alone, and CSG/CRDS adds another 9.7% on most earned income. Combined effective rates routinely exceed US federal rates from the second bracket up. The Foreign Tax Credit on Form 1116 absorbs your US liability, builds carryover, and keeps your earned income on the return for the Child Tax Credit, IRA contributions, and ACA eligibility. FEIE on Form 2555 caps at $130,000 (2025), wastes the excess French tax, and locks you out of refundable credits.

WO-CS07 (FEIE vs FTC in France) runs the side-by-side calculation. The conclusion almost always favors FTC unless you have a very low-tax partial year. WO-US01 covers the underlying mechanics.

• Use FTC for almost every case; carryover builds quickly in France.
• FEIE only competes when French tax is unusually low — first or last partial year.
• The CSG/CRDS portion of your French tax bill is now creditable for US purposes.

Reporting: FBAR, FATCA, Assurance Vie, and Real Estate

Standard US international reporting applies in full. French current accounts, savings accounts (Livret A), brokerage accounts, and assurance vie contracts count toward the $10,000 FBAR aggregate. FATCA Form 8938 thresholds for single filers abroad ($200,000 year-end / $300,000 peak) catch most American residents in France. France enforces its own reporting on foreign accounts via Formulaire 3916, and the failure penalty is steep.

The PFIC trap is acute in France because assurance vie — the country's flagship tax-deferred wrapper — is built on French and Luxembourg-domiciled funds. Almost every fund inside an assurance vie is a PFIC under IRC §1297, triggering Form 8621 and the §1291 punitive regime unless you make a QEF or mark-to-market election (rarely available). WO-CS21 (PFIC Rules for US Expats) covers the trap and WO-US02/US03 cover FBAR and FATCA.

• Form 3916 declares foreign accounts to French authorities; non-filing penalty is €1,500 per account.
• Assurance vie funds are PFICs to the IRS regardless of French treatment.
• French real estate is reportable on the Impôt sur la Fortune Immobilière (IFI) above €1.3M of net real estate assets.

Pensions, Social Security, and Totalization

Article 18 of the US-France treaty handles pensions and explicitly addresses US Social Security paid to French residents (taxable only in the US for US citizens, taxable only in France for French nationals). 401(k)s and IRAs are recognized as pension plans under the treaty, giving US-citizen residents of France inside-the-plan deferral and treaty protection on distributions. The interaction with French social charges on retirement income is fact-specific.

The US-France Totalization Agreement prevents double payroll taxation. A US employee seconded to France for under 5 years can stay on US FICA with a Certificate of Coverage. Locally hired employees and long-term residents move onto French social charges. Self-employed Americans in France pay into the French régime social des indépendants and are exempt from US self-employment tax.

State Tax Hangover and the Domicile Question

As with the UK and Canada corridors, leaving the US does not automatically end state taxation. California's FTB is the most aggressive — they will follow you to Paris and demand evidence of severed ties. Establishing a clean domicile in Florida, Texas, Washington, or another no-income-tax state before departure is the standard mitigation. WO-CS19 (US State Domicile) is the practical playbook for cutting the cord, with concrete documentation steps.

Year-One Action Plan

French bureaucracy rewards documentation and punishes the assumption that anything is automatic. Build the paper trail from day one and the rest of the corridor becomes manageable.

• Confirm your French residency basis under CGI Article 4 B and the date you crossed.
• Register with the French tax authority and obtain a numéro fiscal.
• File Form 3916 for every foreign account in your first French return.
• Avoid assurance vie as a US citizen unless you have specialist tax advice.
• Use FTC, not FEIE, on your first US return as a French resident.
• File FBAR for every year your aggregate French accounts crossed $10,000.
• Read WO-US01, WO-US02, WO-US03, then WO-CS06, WO-CS07, and WO-CH01.