Article Summary
- Many mainstream US brokerages will restrict trading or close an account outright once a customer's address of record becomes a foreign country, often with little warning, which is why address planning matters before a move, not after.
- The IRS treats most foreign-domiciled mutual funds and ETFs as PFICs (passive foreign investment companies), a category subject to notoriously punitive and complex tax and reporting rules, which is why most US tax advisors steer expats toward continuing to hold US-domiciled funds instead.
- The Foreign Earned Income Exclusion and Foreign Tax Credit exist specifically to prevent US citizens abroad from being taxed twice on the same income, but neither eliminates the separate obligation to keep filing a US tax return every year, regardless of where you live.
"The stock market is a device for transferring money from the impatient to the patient."
Warren Buffett
Somewhere around month three of living abroad, a lot of new expats get the same unpleasant surprise: a letter from their US brokerage saying the account is being restricted or closed because of the new foreign address. It's rarely explained well, and it lands right when someone is already juggling a dozen other adjustments to a new country. The good news is this is a known, well-mapped problem with real workarounds — it just requires understanding a couple of pieces of the tax code that most people never think about until they're staring at that letter.
Why Brokerages Restrict Accounts With Foreign Addresses
US brokerages operate under securities regulations that vary by country, and many firms decide it's simpler to avoid the compliance burden of registering to serve customers in dozens of foreign jurisdictions than to navigate it. The practical result is that some brokerages will restrict new purchases, disable certain account features, or in some cases close the account entirely once a customer updates their address to a foreign country. This isn't universal — a number of major brokerages do knowingly and explicitly serve US citizens living abroad, and some expats simply keep a US address on file (a family member's home, a virtual mailbox) rather than update it at all, which is common but does carry some risk if the brokerage later discovers the mismatch. The practical takeaway is to research a specific brokerage's expat policy, or ask directly, before a move rather than finding out reactively.
The PFIC Trap: Foreign Mutual Funds and ETFs
This is arguably the single most important thing for a US expat investor to understand. The IRS classifies most non-US mutual funds, ETFs, and similar pooled investment vehicles as passive foreign investment companies, or PFICs, a category created originally to discourage Americans from using offshore funds to defer or avoid US tax. In practice, PFIC taxation is notoriously complex, often taxed at less favorable rates than ordinary US investments, and comes with its own extensive annual reporting form, even for a fund with modest gains. Because of this, most cross-border tax advisors recommend that US citizens abroad continue investing through US-domiciled funds and US brokerages wherever possible, rather than opening a local investment account in their new country of residence, even when a local advisor recommends a fund that looks perfectly reasonable to a non-US investor. This single issue causes more real financial pain for expats than almost anything else in this space, largely because it's so unintuitive and easy to stumble into without knowing.
The Foreign Earned Income Exclusion and Foreign Tax Credit
The United States is one of the few countries that taxes its citizens on worldwide income regardless of where they live, which means moving abroad doesn't end the obligation to file a US tax return. Two mechanisms exist specifically to prevent double taxation: the Foreign Earned Income Exclusion, which lets qualifying expats exclude a portion of foreign-earned income (the exact amount is adjusted annually) from US taxable income, and the Foreign Tax Credit, which offsets US tax liability using taxes already paid to a foreign government. Which one is more advantageous depends heavily on the expat's income level, the tax rate in their country of residence, and whether they have investment income in addition to earned income — this is genuinely one of the more situation-specific corners of the tax code, which is why most expats with anything beyond a simple salary benefit from at least one consultation with a cross-border tax preparer rather than guessing.
A Practical Framework for Expat Investing
Before moving abroad, confirm your current brokerage's policy on foreign-resident accounts directly with them, and research whether a small number of brokerages known to explicitly support expats might be a better long-term fit. Once abroad, avoid buying foreign mutual funds, ETFs, or similar pooled investments through a local bank or advisor without first understanding the PFIC implications, even if the product is recommended enthusiastically by a well-meaning local professional. Continue filing US tax returns annually regardless of income level or whether tax is ultimately owed, and get a real handle on whether the Foreign Earned Income Exclusion or Foreign Tax Credit fits your situation better, ideally with a tax preparer who specifically handles expat returns rather than a generalist. None of this needs to be intimidating once mapped out — the mistakes that cause real damage are almost always the ones made by not knowing these rules existed in the first place.