Key Takeaways
- Moving abroad doesn’t end your U.S. tax obligations, especially if you earn side‑hustle income.
- Staying organized and planning for both tax systems helps you avoid costly surprises.
Moving abroad changes your finances, but it doesn’t change your U.S. tax obligations. I regularly talk to clients who assume that once they or their income and assets leave the U.S., the IRS is no longer interested. In fact, the U.S. taxes its citizens on worldwide income and requires reporting of foreign accounts and assets, regardless of where you live.
Many expats also assume a side hustle—like freelance work or an online shop—is too small or too casual to count. The IRS disagrees. For most expats, the real risk isn’t double taxation; it’s missing a filing or reporting requirement they didn’t know existed, a risk that grows as your finances become more international.
Treat side‑hustle income like business income from the start
Side‑hustle income such as freelance work, consulting, e‑commerce, or content creation counts as taxable income in the U.S., even when clients are abroad and payments land in a foreign bank account. Earning money outside the United States does not remove it from the U.S. tax system.
That income also triggers self‑employment tax—a 15.3% rate that many expats running side businesses overseas don’t expect. Expat tax breaks like the Foreign Earned Income Exclusion (FEIE) and the Foreign Tax Credit can reduce U.S. tax on foreign income, but neither offsets self‑employment tax. Start keeping detailed records of income and deductible business expenses as soon as money begins to flow. Reconstructing a year’s worth of transactions at tax time is far harder than tracking them from day one.
Track and stay ahead of foreign bank account reporting rules
Living abroad usually means opening at least one foreign bank account, and entrepreneurs with side businesses often end up with several accounts split between personal and business use. If the combined maximum value of your foreign financial accounts exceeds $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts (FBAR). The $10,000 threshold applies to the total across all accounts you control, not to each account individually.
For example, a freelance consulting account that peaked at $8,000 and a personal checking account that reached $3,000 together exceed the threshold, so an FBAR is required for both.
U.S. expats may also need to file Form 8938 for FATCA reporting, which has higher thresholds that depend on filing status and residence abroad. Neither FBAR nor FATCA is a tax; both are reporting requirements, but failures to file can result in steep penalties.
Keep track of your foreign accounts and their highest balances each year to avoid costly mistakes.
Be careful with foreign investments and business structures
A structure that is normal or tax‑efficient in your country of residence can be treated very differently by the IRS. Foreign mutual funds and some pensions, for example, are often classified as Passive Foreign Investment Companies (PFICs), a designation that can trigger punitive tax treatment and complex reporting obligations. Similarly, when a side hustle grows and you decide to form a local company, the entity may create new reporting duties such as Form 5471 for U.S. owners of certain foreign corporations.
Check U.S. tax treatment before buying a foreign investment or incorporating abroad, not after the fact.
Make cross‑border tax planning part of your routine
The clients who avoid costly surprises in my practice are those who review their tax position as decisions happen, not just once a year when a return is due. Whenever you start a new income stream, open an account, purchase a foreign investment, or take an ownership stake in a business, revisit your tax situation.
Organization and proper documentation are essential. Track account balances, income invoices, taxes paid abroad, and foreign investments. Structure larger business or investment decisions with both U.S. and local tax systems in mind.
Don’t let success abroad become a tax problem back home
Living abroad shouldn’t stop you from earning extra income, growing a side hustle into a business, or investing globally, but it does mean you must be mindful of two tax systems simultaneously. By understanding your reporting obligations, you can ensure that international opportunities remain an advantage, not a U.S. tax headache.