How Does a Backdoor Roth IRA Work for U.S. Expats?

A backdoor Roth IRA lets U.S. expats contribute to a Roth even when their income exceeds the direct contribution limits ($150,000 single/$236,000 MFJ for 2026). You make a non-deductible contribution to a traditional IRA, then convert it to a Roth, owing tax only on any pre-tax balance already in the account (IRS: Rollovers of Retirement Plan and IRA Distributions).

The three-step process:

• Step 1: Contribute up to $7,000 ($8,000 if 50+) to a traditional IRA as a non-deductible contribution
• Step 2: Convert the traditional IRA balance to your Roth IRA
• Step 3: Report the contribution on Form 8606 and the conversion on Form 1040

The pro-rata rule is the biggest trap for expats:

The pro-rata rule aggregates all traditional, SEP, and SIMPLE IRA balances. If you have pre-tax IRA money, a large portion of each conversion becomes taxable.

Expat-specific considerations:

• FEIE users still need compensation: even a backdoor Roth requires earned income not excluded by the FEIE
• FTC users: full compensation preserved, making the backdoor straightforward
• Foreign country recognition: most countries do not recognize Roth tax-free treatment, so conversions may trigger local tax
• Treaty check: U.S.-U.K. and U.S.-Canada treaties have pension provisions that may affect Roth treatment

Rolling over old 401(k) or traditional IRA balances into a current employer plan before conversion eliminates the pro rata problem. Expats with no U.S. employer plan may need to leave pre-tax balances in place and accept partial taxation.

For broader IRA planning, see the IRAs for Expats guide.