Americans living and working in Vietnam answer to two tax authorities on the very same paycheck: the General Department of Taxation in Hanoi and the IRS back in Washington. What catches even seasoned expats off guard is a treaty that looks finished on paper but never actually took effect. The United States and Vietnam signed a comprehensive income tax treaty back in 2015, and Vietnam ratified its side in 2017, but the treaty has sat in the US Senate ever since, so as of August 2026 it has never entered into force and gives nobody any benefit. Vietnam taxes its residents on worldwide employment income, and US citizenship carries its own worldwide tax obligation regardless of where someone actually lives, so an American in Vietnam ends up filing in both countries every year with the Foreign Tax Credit and the Foreign Earned Income Exclusion, not any treaty article, doing all the work of preventing double taxation.
Do US Citizens Living in Vietnam Have to File Both Vietnamese and US Tax Returns?
Yes, almost without exception. Vietnam decides tax residency with a 183-day physical presence test or by registered permanent residence, and clearing that bar puts the General Department of Taxation onto a person's entire worldwide employment income. Citizenship, not Vietnamese residency, is what triggers the US side: American citizens and green card holders answer to the IRS on worldwide income wherever they happen to be living.
The result is two filing tracks that never actually talk to each other, since the US-Vietnam treaty has never entered into force to coordinate them the way a treaty does for most other expat destinations. Paying Vietnamese tax does not excuse the US Form 1040, and filing the US return does not excuse the Vietnamese obligation either. Every ounce of double-tax planning on the US side falls to the Foreign Tax Credit and Foreign Earned Income Exclusion, because there is no treaty around to pick up any of the slack.
How Does Vietnam Tax Residents on Worldwide Employment Income?
Vietnam applies its personal income tax to residents on worldwide employment income once the 183-day test or permanent residence standard is met, and that determination is the starting point for figuring out what an American in Vietnam actually owes there before turning to the US return. Someone who does not meet the residency threshold is generally taxed only on Vietnam-source income instead, so the residency call matters immediately for scoping the Vietnamese filing.
Vietnamese tax rules and filing deadlines should always be confirmed for the current year, since foreign tax figures change and a stale number can throw off the US Foreign Tax Credit that depends on it. Employers in Vietnam commonly withhold tax from payroll throughout the year, similar to US wage withholding, with a reconciliation filing due after year end for anyone with additional income sources.
Should You Claim the FEIE or the Foreign Tax Credit on Vietnamese Income?
For Americans earning income in Vietnam, the choice between the Foreign Tax Credit and the Foreign Earned Income Exclusion depends heavily on income level and family circumstances, and it is worth comparing both every year rather than defaulting to one election out of habit. Neither one is automatically better without knowing how much Vietnamese tax was actually paid and whether the family relies on the refundable Child Tax Credit.
The Foreign Tax Credit on Form 1116 credits Vietnamese income tax dollar for dollar against US tax, computed by income category under IRC Sections 901 and 904, with unused credit carrying over as shown in the table below. The Foreign Earned Income Exclusion on Form 2555, under IRC Section 911, works differently: it exempts a Vietnam-based salary outright up to an annually indexed maximum ($130,000 for 2025), which comfortably covers the pay packages of most teachers, engineers, and mid-level managers based in Hanoi or Ho Chi Minh City, but it does nothing for self-employment tax and can knock out the refundable Additional Child Tax Credit for a family with kids. Revoking it also locks a filer out of re-electing the FEIE for five years absent IRS consent, which is one more reason higher earners in Vietnam tend to gravitate toward the credit instead. Our FEIE versus Foreign Tax Credit comparison walks through the tradeoffs in more detail.
Is There a US-Vietnam Tax Treaty, and What If There Isn't?
This single fact trips up more people than anything else in US expat taxes in Vietnam. The United States and Vietnam signed a comprehensive income tax treaty on July 7, 2015, and Vietnam ratified it in 2017, but the US Senate has left it sitting untouched, and as of August 2026 it has still never entered into force. A treaty that Vietnam ratified but the Senate never touched carries no legal weight whatsoever, so there is no treaty relief, no dual-residency tie-breaker, and no treaty-based pension deferral for anyone living there.
Because no treaty is in force, double-tax relief rests entirely on domestic US law: the Foreign Tax Credit under IRC Sections 901 and 904, and the Foreign Earned Income Exclusion under IRC Section 911. Even without treaty language spelling it out, Vietnamese income tax paid is generally still creditable on Form 1116 as a matter of ordinary Foreign Tax Credit rules, so the absence of a treaty does not by itself cause double taxation, provided the return is prepared correctly. What it does remove is every planning tool that depends specifically on treaty text, from a saving clause analysis to a treaty-based residency tie-breaker to a treaty article deferring tax on a Vietnamese pension. If the treaty is ever ratified by the US Senate in the future, the analysis in this article would need to be revisited from scratch.
Are Vietnamese Investment Funds Taxed as PFICs?
Generally, yes, and it is one of the costlier surprises waiting for Americans who invest through a Vietnamese bank or brokerage. Local mutual funds and unit trusts, the standard pooled products sold by Vietnamese asset managers, almost always meet the IRC Section 1297 definition of a passive foreign investment company, which pulls in the Section 1291/1298 tax regime. That label comes from US tax law alone, has nothing to do with how the fund is taxed inside Vietnam, and applies whether or not a treaty is ever ratified.
Skip the election and the default outcome is brutal: gains and certain distributions from that Vietnamese fund get spread across the entire holding period, taxed at the highest rate that applied in each of those years, and charged interest on top, with a separate Form 8621 due for every single fund even in a year when no tax ends up owed. That math is exactly why most Americans in Vietnam end up parking savings in US-domiciled brokerage accounts and US index funds instead of a locally sold fund.
How Are Vietnamese Pensions and Retirement Accounts Taxed by the US?
A common assumption trips people up here: because contributions to Vietnamese compulsory social insurance are mandatory and get favorable tax treatment locally, many expats figure the IRS must defer tax on the account the same way. It does not, and with the treaty never having entered into force there is no provision available to change that. Vietnamese compulsory social insurance, along with any employer-sponsored or private pension arrangement, is not automatically tax-deferred for US purposes just because Vietnamese law treats it favorably.
IRC Sections 401(a) and 402(b) set the default: income accruing inside a foreign retirement arrangement is taxed to a US person as it accrues unless a specific treaty article defers it, and since no US-Vietnam treaty exists to invoke, that escape hatch simply is not on the table. Compulsory social insurance, an employer scheme, or a private retirement product each has to be worked through on its own facts under that default rule rather than assumed to be deferred. Our foreign pension US tax treatment guide walks through the questions that determine the answer for any foreign plan, including whether growth is taxed as it accrues and how distributions are eventually taxed.
What Foreign Accounts and Assets Must You Report?
Beyond the income tax return itself, Vietnamese financial accounts and investments carry their own separate reporting obligations that apply whether or not any US tax is owed, and none of them depend on the treaty ever entering into force. These filings are enforced on their own terms, and the penalties for missing them are typically far larger than any underlying tax would have been.
An everyday Vietnamese dong savings account rarely trips the wire alone, but stack it with a brokerage account for local stocks and a compulsory social insurance balance, and an American frequently crosses the FBAR line on FinCEN Form 114, filed once combined foreign account balances exceed $10,000 aggregate at any point in the year; see our FBAR filing guide. A separate and generally higher-dollar threshold under Form 8938 and FATCA can additionally force those same accounts onto the federal return itself, not just a Treasury filing; see our Form 8938 guide. And because no US-Vietnam totalization agreement exists, a self-employed American in Vietnam should not assume Vietnamese social insurance contributions offset US self-employment tax; our guide to totalization agreements and self-employment tax abroad explains why that coordination is unavailable here.
Bottom Line
The single biggest trap in US expat taxes in Vietnam is treating a signed and Vietnam-ratified treaty as if it were actually in force, when the US Senate's decade of inaction means it delivers nothing. The General Department of Taxation and the IRS run on entirely separate tracks, leaving the Foreign Tax Credit and the Foreign Earned Income Exclusion to carry the full weight of avoiding double taxation by themselves. Add in a missing totalization agreement, PFIC-tainted local funds, and a compulsory social insurance system with no treaty deferral, and Vietnamese investment funds and pension arrangements each pile their own separate US tax and reporting rules on top of the ordinary income tax return. Getting any one of these pieces wrong tends to cost far more in penalties than the underlying tax ever would have.
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