Retirement Planning for Self-Employed Expats: IRAs, SEPs, and the Solo 401(k) Explained
Most retirement planning content is written for someone with a W-2, an employer-sponsored 401(k), and a tax return that fits neatly into TurboTax. If that's not you - if you're self-employed, living outside the U.S., and trying to figure out how to invest your money without creating a tax nightmare - most of that advice doesn't apply.
The good news is that the IRS does provide solid retirement savings vehicles for self-employed people, including those living abroad. The challenge is that the rules overlap in ways that aren't obvious, and a few of those overlaps hit expats particularly hard. Choosing the wrong plan, or investing through a foreign country's retirement system instead of a U.S.-based one, can cost you significantly - either in taxes you didn't expect or in contribution opportunities you didn't realize you'd lost.
This article walks through the four main options available to self-employed expats, the expat-specific complications you need to plan around, and a practical framework for deciding which plan - or combination of plans - actually makes sense for your situation.
Why Standard Retirement Advice Doesn't Work for Expats
Generic financial planning assumes a lot of things that simply aren't true for self-employed expats. It assumes you have earned income that shows up cleanly on a U.S. return. It assumes your filing status is straightforward. It assumes you aren't also managing the tax rules of a foreign country at the same time.
One of the first questions that comes up for U.S. expats investing outside the U.S. is whether to use their country of residence's retirement vehicles instead of U.S. plans. The short answer: generally, don't. The IRS may not recognize the tax-deferred status of a foreign country's retirement plan, which means growth inside that account could be taxable year by year in the U.S. even if the local rules treat it as deferred. Foreign mutual funds held outside of a U.S. retirement account can trigger PFIC (Passive Foreign Investment Company) rules, which carry punishing tax treatment. As a rule, if you're a U.S. citizen living abroad, staying within the U.S.-based retirement plan system is almost always easier to manage and more tax-efficient in the long run.
That leaves four main options: the Traditional IRA, the Roth IRA, the SEP-IRA (Simplified Employee Pension), and the Solo 401(k). Each works differently, and none of them is universally right for every self-employed expat.
Understanding Your Options: The Four Plans on the Table
The Traditional IRA and Roth IRA represent the entry-level tier - simpler to open, lower contribution limits, but accessible even with modest income. For 2025, the contribution limit across both is $7,000 per year, with a $1,000 catch-up contribution available if you're 50 or older.
The Traditional IRA gives you a deduction going in, and distributions in retirement are taxable. The Roth IRA flips that structure: contributions go in after-tax, but qualified distributions in retirement come out completely tax-free. That's a meaningful long-term advantage - retiring with a pool of money you can draw from without any tax impact is a significant benefit.
The SEP-IRA and Solo 401(k) operate at a different scale. Both allow contributions up to $70,000 for 2025, based primarily on a percentage of your self-employment income. They require more structure to administer but offer dramatically larger deductions for self-employed people with meaningful income.
Before getting into the mechanics of each, there are two expat-specific complications that need to be understood upfront - because they can affect your eligibility to contribute to any of these plans at all.
The FEIE Conflict: What Most Expats Don't See Coming
The Foreign Earned Income Exclusion (FEIE) is one of the most valuable tax benefits available to U.S. expats. If you qualify - either through the bona fide residence test or the 330-day physical presence test - you can exclude a significant portion of your foreign-earned income from U.S. taxation. For 2025, that exclusion is over $126,000.
The problem is that both the Traditional IRA and the Roth IRA require earned income as the basis for contributions. If you make $100,000 of self-employment income but take the full FEIE, your U.S. tax return effectively shows zero earned income. No earned income means no IRA contribution - for either type.
This catches people off guard because the FEIE feels like a clean win. And it usually is. But if retirement account contributions are part of your financial plan, the FEIE creates a conflict that needs to be managed on the front end - not after you've already filed.
One practical workaround: spend a portion of the year working in the United States. Income earned while physically in the U.S. is U.S.-source income and isn't eligible for the FEIE, so it preserves your earned income base for IRA contribution purposes. Even a week or two of U.S.-based work can solve the problem. But this is exactly the kind of thing that needs to be part of your planning conversation before the year ends, not a question you bring to your accountant in April.
Roth IRA Access When You're Filing Separately
The Roth IRA has income thresholds that determine whether you can contribute directly. For 2025, single filers phase out at $150,000 and married filing jointly filers phase out around $236,000. Above those limits, direct Roth contributions aren't allowed.
For expats, the married filing separately threshold is where things get complicated. If you file married filing separately, the Roth phase-out starts at just $10,000 of income - essentially eliminating Roth access for anyone with meaningful earnings. And many expats who are married to non-U.S. citizens have no choice but to file separately unless they make a specific election to treat their non-resident spouse as a U.S. tax resident, which has its own set of implications.
The backdoor Roth IRA is the workaround. The mechanism is straightforward: you contribute to a Traditional IRA (no income limit applies to contributions themselves, only to the deductibility), and then convert that Traditional IRA to a Roth IRA. The conversion triggers tax on the pre-tax amount, but it sidesteps the income-based contribution limits entirely.
The timing of that conversion matters. The goal is to convert in a year when your effective tax rate is lower - ideally a year when income is down, deductions are up, or both. Converting in a high-income year defeats much of the purpose. This is one of the planning conversations worth having annually, not just once.
SEP vs. Solo 401(k): Matching the Plan to Your Income
For self-employed expats with cash flow above the IRA limits and a desire to shelter more income, the SEP-IRA and Solo 401(k) are where the real planning happens.
The SEP-IRA is straightforward. You can contribute up to 25% of your net self-employment income, capped at $70,000 for 2025. The math on that cap: if your net self-employment income is at least $280,000, 25% of that gets you to the maximum. If you operate through a sole proprietorship or a single-member LLC, the calculation is simple - net income, times 25%, subject to the cap.
If you operate through an S corporation, the calculation shifts. Because an S-corp requires you to pay yourself a reasonable salary, it's your W-2 compensation - not total business income - that the 25% applies to. That means optimizing the SEP contribution involves balancing your salary level against your self-employment tax exposure, since every additional dollar of salary increases both your FICA liability and your potential SEP deduction. It's a genuine tradeoff that deserves attention.
One significant advantage of the SEP: you have until the due date of your tax return - including extensions - to make the contribution and have it count for that tax year. If you file an extension, that can push your contribution deadline into October of the following year. That flexibility makes cash flow planning considerably easier.
The Solo 401(k) follows the same 25% employer-side contribution rule, with the same S-corp nuance. What makes it more powerful for many self-employed expats is the employee side of the plan. Because you are simultaneously the employer and the employee of your own business, you can also contribute up to $23,500 for 2025 as an employee elective deferral - on top of the employer-side contribution. If you're 50 or older, a catch-up provision adds another $7,500. For those between 60 and 63, a new super catch-up provision under recent legislation increases that figure further.
The practical implication: if your net self-employment income is $200,000, a SEP-IRA would allow you a $50,000 deduction (25% of $200,000). A Solo 401(k) at the same income level could potentially get you to $70,000 by combining the employer-side $50,000 with an employee-side deferral - without needing the income to support a full 25%-to-maximum calculation.
There is one important timing distinction. The employer-side contribution to a Solo 401(k), like the SEP, can wait until the tax return due date. The employee deferral, however, must be elected and contributed before December 31. For S-corp owners, that means coordinating with payroll before year-end. Missing that window closes the employee deferral entirely for that year - and with it, potentially $23,500 or more in deductions.
For self-employed expats earning above $280,000, the SEP becomes the more practical choice. At that income level, both plans max out at $70,000 anyway, and the SEP is simpler to administer with no year-end payroll coordination required. Below that threshold, the Solo 401(k)'s ability to blend employer and employee contributions gives you more flexibility to reach - or approach - the $70,000 ceiling without needing the underlying income to get there purely on the 25% formula.
One factor that belongs in this conversation regardless of income level: liquidity. Retirement account funds are generally inaccessible without a 10% early withdrawal penalty until age 59½. Not every dollar of surplus cash should go into a retirement plan. Depending on your financial goals, some of that money may be better positioned in a more liquid investment strategy - even if it means paying more tax on it now.
Deadlines, Administration, and What to Do Before Year-End
The planning implications differ by plan, and getting the timing right is as important as choosing the right vehicle.
For the SEP-IRA, there's very little you need to do during the year. The contribution amount is calculated after year-end based on actual net income, and the deposit can be made any time before your return is filed - or extended. That makes it a natural fit for self-employed people with variable income who can't easily estimate their annual earnings mid-year.
The Solo 401(k) requires more proactive management. The plan itself needs to be established before December 31 of the year you want to start contributing. The employee elective deferral - up to $23,500 - must also be processed through payroll before year-end. For S-corp owners, that means the deferral needs to flow through your payroll system and reduce your W-2 earnings before the calendar turns. The employer-side contribution can still be made after year-end by the return due date, but the employee side cannot.
These plans can also be combined. It's possible to contribute to an IRA - or execute a backdoor Roth conversion - alongside a SEP or Solo 401(k), as long as the contribution limits and earned income requirements are met. The interaction between FEIE usage and IRA eligibility needs to be assessed each year, since the income mix can change.
Putting It All Together
There's no single retirement plan that works best for every self-employed expat. The right answer depends on your income level, your business structure, your filing status, your FEIE usage, your cash flow needs, and how soon you might need access to those funds.
That said, a general framework holds up across most situations. The Solo 401(k) offers the most flexibility and the highest potential deduction for self-employed expats earning under $280,000 in net income. Above that threshold, the SEP-IRA delivers the same maximum contribution with significantly less administrative complexity. For those at lower income levels, or those who can't contribute to the employer-side plans due to FEIE limitations, IRAs - and backdoor Roth conversions in particular - remain a valuable part of the picture.
What these plans have in common is that they reward front-end planning. The decisions that matter most - whether to take the FEIE, how to structure your salary if you operate through an S-corp, when to convert a Traditional IRA to a Roth - are decisions that need to be made during the year, not reconstructed after it ends.