You Worked in the US and Now Live in France: 8 Costly Mistakes Killing Your American Pension

David is 64. He spent 11 years in San Francisco working for a tech company before moving to Bordeaux with his French wife. Smart guy. Organized. He’s the kind of person who reads the fine print. And yet — at our first consultation — he discovered he’d been entitled to $1,180/month in Social Security benefits since he turned 62. He didn’t know. Nobody told him.

He had quietly lost $28,320 in unclaimed pension payments. Gone. Non-recoverable.

David is not an exception. He’s what we see every week at RetraiteConseil.

If you worked in the United States — even for a few years — and you now live in France, you almost certainly have American retirement rights. And there’s a good chance you’re letting them expire quietly while French administration handles your French side and nobody handles the other.

Here are the 8 mistakes we see destroying thousands of dollars in pension income every year for English-speaking expats who thought they had it covered.

Mistake #1 — Assuming You Didn’t Work Long Enough in the US to Qualify

This is the most expensive misconception we encounter.

Standard rule: you need 40 quarters (10 years of contributions) to qualify for Social Security retirement benefits. But since the France-US Totalization Agreement came into force in 1988, your French working years can be combined with your American quarters to cross that threshold.

Translation: if you worked 6 years in the US and 20 years in France, the SSA can count your French years to verify you reach 40 quarters. Your American pension right is open. The amount will be proportional to your US years only — but it exists, and it’s yours.

How much are we talking? For 5 to 8 years of US career at a professional salary, Social Security benefits typically range between $600 and $1,400/month. For life.

Every month you spend thinking « I’ll look into it someday » is a month of pension you will never see again.

Mistake #2 — Waiting Until You « Figure It All Out » Before Filing

The Social Security Administration does not pay retroactively without limits.

The rule is brutal and simple: you get paid from the date you file your claim — not from the date you became eligible. Every month of delay is a month of pension permanently lost.

At an average of $900/month, one extra year of « I’ll get to it » costs you exactly $10,800. We regularly meet expats who waited 2, 3, sometimes 4 years to file, citing administrative complexity. Some have lost more than $40,000 in unclaimed benefits.

The process takes 6 to 12 months once started. The best time to file was a year ago. The second best time is right now.

Mistake #3 — Letting France Handle Everything and Hoping They’ll Contact the US

Sounds logical. It’s wrong. And it costs months — sometimes years — of unnecessary delays.

Here’s how the official bilateral circuit works from France:

You → your French pension fund (CNAV / CARSAT) → which transmits to the Centre de Sécurité Sociale des Travailleurs Migrants (Paris) → which contacts Baltimore SSA → which processes your American file.

The problem: if your French fund determines that you already have enough quarters for your French full-rate pension, it has no obligation to flag your American career to the SSA. It often doesn’t. And your US pension vanishes into administrative limbo.

The precise number of French quarters required for the full rate (taux plein) depends on your birth year — and it’s not always 172 as many assume:

(Source: lassuranceretraite.fr official data)

If your French fund sees you have 172 quarters and you were born in 1962 — needing only 169 — it considers your file complete and closes it. Your American years disappear. Nobody calls you to say what happened.

The right move: explicitly mention your US career from your very first contact with any French pension authority, and insist on the bilateral processing route. Better yet: let a specialist firm manage both files simultaneously.

Mistake #4 — Not Knowing That Your Social Security Is Taxed in the US, Not France

This one comes with both good news and a tax trap.

Under the France-US Tax Treaty (Article 18), Social Security benefits paid to a French resident are taxable only in the United States — not in France. That’s a genuine advantage.

But this favorable treatment requires an active step on your part: you must submit Form W-8BEN to the SSA to certify your French tax residency. And you must renew it every 3 years.

Miss this form? The SSA can withhold 30% at source from every payment. That’s $270/month retained on a $900 pension. Silently. Every month.

Most of our clients learn about this form at their first audit. Usually after months of unjustified withholding that nobody warned them about.

Mistake #5 — Forgetting Your AGIRC-ARRCO Supplementary Pension Entirely

Your CNAV base pension is not the only French retirement pot to optimize.

If you contributed in France as a cadre (executive/manager), you also accumulated AGIRC-ARRCO points — the French supplementary pension for managerial staff. These points don’t expire. But they don’t pay themselves either. You have to file a claim.

Many English-speaking expats — especially those who left France years ago — simply forget they have AGIRC-ARRCO rights. The points sit there, dormant, while the clock ticks.

And here’s where timing becomes critical: waiting just one year beyond your French legal retirement age to claim AGIRC-ARRCO gives you a 10% bonus on your supplementary pension for one year. Wait two years: +20% for two years.

On a €800/month supplementary pension, that’s up to €1,920 in annual bonus. Almost nobody exploits this. Almost nobody does it alone without getting the timing wrong.

Mistake #6 — Not Revising Your File After the WEP Was Abolished

If you left the US before 2025, you may have heard of the WEP — Windfall Elimination Provision. This rule slashed your Social Security if you received a pension from a foreign system (like French CNAV). It could reduce your American pension by up to $613/month.

The WEP was permanently abolished on January 5, 2025 under the Social Security Fairness Act. Retroactively to January 1, 2024.

What this means for you: if you were already receiving a WEP-reduced Social Security, you are entitled to a recalculation and a back-payment. The SSA began correcting files in April 2025 — but they will not contact you spontaneously if nobody is monitoring your case.

We see clients every week still receiving WEP-reduced pensions that should have been revised months ago. Some are owed multi-thousand-dollar catch-ups.

Mistake #7 — Thinking Your 401(k) Will « Sort Itself Out » From France

You have a 401(k), 403(b), or IRA sitting in the US. Join the club of « I’ll deal with it later. » It’s the quietest trap — and often the most expensive.

Critical points most expats discover too late:

Required Minimum Distributions (RMDs) begin at age 73. If you fail to withdraw the minimum amount required, the IRS penalty is 25% of the non-withdrawn amount. This rule applies even if you live in France.

Withdrawals from France are taxed in the US, not France (tax treaty). But they affect your effective tax rate in France by counting toward your reference income. Without planning, you can push yourself into a higher French bracket on your other income without realizing it.

Since 2026, catch-up contributions for employees earning over $150,000 must mandatorily go into a Roth account (SECURE Act 2.0). If you still have US income, your contribution strategy needs reviewing.

There is no universal answer for managing a 401(k) from France. There is only your answer — and nobody will build it for you.

Mistake #8 — Not Recalibrating Your Timeline After the French Retirement Reform Suspension (September 2026)

This is the newest trap. And the one affecting the most people right now.

France’s National Insurance Authority (Assurance retraite) has officially confirmed: with the suspension of the 2023 retirement reform, the legal retirement age is changing for all pensions taking effect from September 1, 2026 onwards.

What this means for Franco-American expats specifically:

Your French departure window has moved. And with it, the optimal timing to trigger your Social Security. These two clocks are linked: if you leave France at a different age than originally planned, your US filing strategy needs to change — because every year’s difference in Social Security claiming age shifts your monthly benefit by 6% to 8%, permanently.

The automatic full-rate age in France — the age at which you receive maximum pension regardless of how many quarters you have — remains tied to your birth year:

(Source: lassuranceretraite.fr official data)

The problem: most of our clients planned their departure 2 or 3 years ago based on the previous rules. Those calculations are now outdated. And nobody has called them to say so.

The result: some will trigger their French pension at an age that is no longer optimal. Others will miss the coordination window with the SSA. A few will lose their AGIRC-ARRCO timing bonus because their new French calendar no longer aligns with the waiting strategy they had planned.

If your retirement plan was built before 2025, it needs to be rebuilt from scratch.

What These 8 Mistakes Have in Common

They all happen to smart, high-achieving people — professionals who managed international careers, navigated two languages, two tax systems, two countries. People who don’t make management mistakes.

But Franco-American retirement sits at the exact intersection of two complex systems that don’t communicate with each other, aren’t required to help you, and won’t flag the gaps on your behalf.

The French CNAV will not tell you to claim your Social Security. The SSA will not tell you to claim your AGIRC-ARRCO. The Assurance retraite will not call you to say your departure plan is now obsolete. And nobody will check your numbers unless you ask someone to.

What We Do at RetraiteConseil

We have specialized in Franco-American retirement files for over 15 years. Our work starts exactly where the administrations stop.

For every client, we conduct a full cross-border audit:

• Verification of all SSA, CNAV, and AGIRC-ARRCO rights and entitlements
• Detection of errors on French and American career records — more common than you’d think
• Optimal departure age calculation based on your specific tax profile and life expectancy
• Simultaneous coordination of claims on both sides of the Atlantic
• 401(k) / IRA withdrawal strategy from France
• Form tracking (W-8BEN renewals, SSA-2490 filings, post-WEP revision requests)
• Full recalibration for the September 2026 reform changes

Our clients recover an average of $5,200 per year on rights they didn’t know they had or were badly optimized.

How much is your current situation costing you per month?

👉 Request your Franco-American retirement audit — limited to 10 files per month

Free initial consultation. Response within 48 hours. Available in English.

Article written by the RetraiteConseil.com team — independent retirement consulting firm, Paris. Specialists in Franco-American retirement optimization since 2010. Data current as of May 2026. This article is for informational purposes only and does not constitute personalized advice.

→ Also read:

• End of WEP: What Americans Who Worked in France Need to Know →
• Optimize Your Retirement Between France and the United States →
• Understanding the French Retirement System for International Workers →