The Core Filing Mechanics
Vietnam and the US both run calendar-year tax systems, simplifying reconciliation between the two returns. Without a ratified tax treaty to lean on, Americans here rely entirely on domestic-law mechanisms, the FEIE and the Foreign Tax Credit, for double-tax relief.
Form 1040 and the Automatic Extension
The standard deadline is April 15, with an automatic extension to June 15 for Americans abroad. Tax owed still accrues interest from April 15, so estimate and pay by then if you expect a balance due. A further extension to October 15 is available on request (Form 4868).
Form 2555: The FEIE Workhorse
Most Vietnam-based salaries fall under the FEIE cap ($132,900 for 2026). Form 2555 is the primary tool here, qualifying via the Physical Presence Test (330 days outside the US) or Bona Fide Residence Test (a full uninterrupted tax year).
Worked Example: A Ho Chi Minh City Corporate Assignment
An American manufacturing liaison earns $92,000 annually on a company-sponsored work permit and TRC in Ho Chi Minh City. She qualifies for the FEIE via Bona Fide Residence after her first full tax year, shielding her entire salary from US tax. Because Vietnam has no ratified treaty, she can't claim treaty-based relief, but doesn't need to, since the FEIE alone covers her income comfortably under the cap.
FBAR: FinCEN Form 114
Required if combined foreign account balances, Vietnamese bank accounts, any local investment accounts, exceed $10,000 USD at any point in the calendar year. Filed electronically, due April 15 with an automatic extension to October 15.
FATCA: Form 8938
A separate, higher threshold attached to your Form 1040: generally $200,000 in specified foreign assets at year-end (or $300,000 at any point) for a single filer abroad, doubled for married filing jointly. Vietnamese banks require US citizens to sign additional FATCA disclosure forms when opening accounts, since the bank itself must report your holdings to the IRS.
Vietnamese PIT Filing for Residents
If you're a Vietnamese tax resident (183+ days present), you'll also owe Vietnamese Personal Income Tax on worldwide income at progressive rates up to 35%, generally handled via employer withholding if you're on payroll, or self-declared if self-employed. Confirm your residency classification carefully, it drives both your Vietnamese and US filing obligations differently.
Streamlined Compliance for Late Filers
If you've been in Vietnam for years without realizing citizenship-based US taxation still applied, the IRS Streamlined Foreign Offshore Procedures let you catch up on the last three years of returns and six years of FBARs without standard failure-to-file penalties, provided the omission was non-willful.