What happens to my 401(k) when I leave the US and move back to Europe?
Short answer: You can typically keep your 401(k) in the US after moving back to Europe, where it continues to grow tax-deferred under most bilateral tax treaties. However, you generally cannot contribute further, and your broker may limit your investment choices. Liquidating the account early usually triggers a 10% US penalty plus immediate taxation in both countries.
Written and reviewed by Anthony Walsh, Selanis. Last reviewed 2026-10-06.
Why it works this way
A 401(k) is a US-qualified retirement plan. Under most US-European tax treaties, the plan remains 'tax-transparent,' meaning your home country will not tax the growth inside the account, only the distributions you take later in retirement. This makes it a valuable tool for long-term savings, even if you never return to the US.
The primary challenge is administrative. US brokerages are increasingly reluctant to service clients with European addresses due to regulatory compliance (MiFID II). While you can legally keep the account, you might be restricted to liquidating positions or holding cash if your broker 'freezes' the account for new purchases once you move.
Distributions in retirement are usually taxed by your country of residence, but the US–Europe treaties often give the US a primary or secondary right to tax, with the residence country providing a credit. For example, under the US–France treaty, US social security and similar pensions (like 401ks) have specific rules that often result in them being taxed primarily in the US.
The expensive mistake: Cashing out the 401(k) to 'simplify' the move
Taking a lump sum distribution when you leave the US is often the most expensive way to move the money. You will face a 10% early withdrawal penalty if under 59.5, and the entire amount will be added to your income in a year when you might already be in a high tax bracket due to US salary or RSU vests.
What to do
- Confirm your broker's non-resident policy — Ask your 401(k) provider if they allow participants to maintain accounts with a European residential address and if investment restrictions apply.
- Update your W-8BEN form — After moving, provide your broker with Form W-8BEN to certify your foreign status and claim tax treaty benefits on future distributions.
- Compare keeping the 401(k) vs. rolling to an IRA — A 401(k) often has better creditor protection, while an IRA offers more investment flexibility but may face different treaty treatment.