Tax Q&A in category: Expat Tax Basics

Q: What is the 30% withholding rate on U.S. income for non-resident aliens, and when does a treaty reduce it?

If you are a non-resident alien (NRA) , the IRS imposes a flat 30% withholding tax on most types of passive U.S.-source income you receive, including dividends, rent, royalties, and certain interest payments. This rate applies automatically unless a tax treaty between the U.S. and your country of residence provides a lower rate or a full exemption. Income types subject to the 30% rate: U.S.-source incomeDefault NRA rateCommon treaty reductionDividends from U.S. corporations30%15% in most treaties; 5% for substantial shareholdersRoyalties30%0-10% in many treatiesRental income (not effectively connected)30% on grossNet election under IRC 871(d) can lower effective ratePensions and annuities30%0-15% depending on treatyInterest (non-exempt)30%0% in several treaties Key exceptions where the 30% rate does NOT apply: Bank deposit interest from U.S. banks is generally exempt Capital gains on U.S. stock (non-real-estate) are not taxable for NRAs unless you are present 183+ days in the U.S. during the year Effectively connected income (wages, U.S. business profits) is taxed at graduated rates on Form 1040-NR , not the flat 30% How to claim a treaty-reduced rate: Provide your payer with a completed Form W-8BEN certifying your foreign status and treaty eligibility The payer withholds at the treaty rate instead of the default 30% If too much was withheld, file Form 1040-NR to claim a refund of the excess The withholding is collected at the source, meaning the U.S. payer deducts the tax before sending you the payment. If you did not file a W-8BEN and 30% was withheld on income that qualifies for a treaty rate, you can recover the difference by filing Form 1040-NR with the applicable treaty article cited. For a broader comparison of how NRA and resident alien tax obligations differ, see our Taxation of Nonresident Aliens guide.

Question 1

How does the Section 6013(g) election let me file jointly with my nonresident alien spouse?

Accepted Answer

The Section 6013(g) election lets you treat your nonresident alien spouse as a U.S. resident for tax purposes, which unlocks Married Filing Jointly (MFJ) status on your Form 1040. Without this election, a nonresident alien spouse cannot appear on a joint return, and you would be limited to Married Filing Separately (MFS) with its higher rates and restricted credits.

How to make the election:

Both spouses sign a written statement declaring the intent to treat the nonresident spouse as a U.S. resident under IRC Section 6013(g)
Attach the statement to your joint Form 1040 for the first election year
If your spouse has no SSN, file Form W-7 (ITIN application) with the return, including original or certified identity documents, or use an IRS Acceptance Agent

What the election triggers: EffectDetailFiling statusMFJ with double standard deduction and lower bracketsIncome scopeYour spouse’s worldwide income becomes reportable on the U.S. returnCredits unlockedChild Tax Credit (if kids have SSNs), FEIE for both spousesReporting expansionFBAR and Form 8938 now cover your spouse’s foreign accounts and assetsBinding natureOnce made, the election stays in effect until formally revoked; revoking permanently bars re-election

The election is most beneficial when your spouse earns little or no income, giving you MFJ brackets and credits without adding much taxable income. It can backfire if your spouse has substantial foreign earnings or large foreign accounts, because the expanded reporting and potential tax liability may outweigh the bracket savings.

For a full comparison of MFJ with the 6013(g) election vs. MFS, see our Filing Joint Taxes with a Foreign Spouse guide.

Question 2

What is the 30% withholding rate on U.S. income for non-resident aliens, and when does a treaty reduce it?

Accepted Answer

If you are a non-resident alien (NRA), the IRS imposes a flat 30% withholding tax on most types of passive U.S.-source income you receive, including dividends, rent, royalties, and certain interest payments. This rate applies automatically unless a tax treaty between the U.S. and your country of residence provides a lower rate or a full exemption.

Income types subject to the 30% rate: U.S.-source incomeDefault NRA rateCommon treaty reductionDividends from U.S. corporations30%15% in most treaties; 5% for substantial shareholdersRoyalties30%0-10% in many treatiesRental income (not effectively connected)30% on grossNet election under IRC 871(d) can lower effective ratePensions and annuities30%0-15% depending on treatyInterest (non-exempt)30%0% in several treaties Key exceptions where the 30% rate does NOT apply:

Bank deposit interest from U.S. banks is generally exempt
Capital gains on U.S. stock (non-real-estate) are not taxable for NRAs unless you are present 183+ days in the U.S. during the year
Effectively connected income (wages, U.S. business profits) is taxed at graduated rates on Form 1040-NR, not the flat 30%

How to claim a treaty-reduced rate:

Provide your payer with a completed Form W-8BEN certifying your foreign status and treaty eligibility
The payer withholds at the treaty rate instead of the default 30%
If too much was withheld, file Form 1040-NR to claim a refund of the excess

The withholding is collected at the source, meaning the U.S. payer deducts the tax before sending you the payment. If you did not file a W-8BEN and 30% was withheld on income that qualifies for a treaty rate, you can recover the difference by filing Form 1040-NR with the applicable treaty article cited.

For a broader comparison of how NRA and resident alien tax obligations differ, see our Taxation of Nonresident Aliens guide.

Question 3

What are my options for filing a U.S. dual-status tax return if I do not have a Social Security Number?

Accepted Answer

Without a Social Security Number, you file a dual-status return with an Individual Taxpayer Identification Number (ITIN) applied for on Form W-7. You file a Form 1040 for the resident portion of the year, attach a Form 1040-NR as a statement for the nonresident portion, and allocate income between the two periods.

Dual-status mechanics:

Resident period: income taxed on a worldwide basis at graduated rates
Nonresident period: only U.S.-source income taxed; passive income at 30% (or treaty rate)
Standard deduction is not available in a dual-status year (itemize or take zero)
Credits and elections (MFJ, EITC) are typically unavailable or limited

How to get an ITIN:

File Form W-7 with:
- Original or certified copies of a passport or other identity documents
- A signed tax return showing the need for the ITIN
- Supporting documentation (visa, entry records)
Submit through:
- IRS Austin mailing address with the return
- A Certified Acceptance Agent (avoids mailing the original passport)
- An IRS Taxpayer Assistance Center in person

Dual-status tax filing steps:

Determine residency starting date (first day of U.S. residence under Green Card or SPT) and ending date
Allocate income between resident and nonresident periods (typically by date received)
Prepare Form 1040 for the resident period
Prepare Form 1040-NR as a statement with “Dual-Status Statement” at the top
File the primary return with “Dual-Status Return” written across the top

Common scenario: a foreign national arriving on H-1B or L-1 mid-year, or a U.S. resident departing the U.S. permanently.

For more on dual-status mechanics, see our Dual-Status Alien guide.

Question 4

What should I do if I don't have a Social Security Number when filing my U.S. taxes?

Accepted Answer

If you do not have a Social Security Number and are not eligible for one, apply for an Individual Taxpayer Identification Number (ITIN) on Form W-7 filed with your U.S. tax return. The ITIN serves as your taxpayer identifier so you can file, claim treaty benefits, and collect refunds.

Who needs an ITIN:

Nonresident aliens with a U.S. filing obligation
Dependents or spouses of U.S. citizens or resident aliens filing jointly or claiming dependents
Nonresident aliens claiming treaty benefits
Foreign nationals receiving U.S.-source income are subject to withholding

How to apply:

Complete Form W-7, identifying your reason for applying
Provide identity documentation:
- A passport is the gold standard (stand-alone document)
- Alternatives include national ID, visa, USCIS documentation, foreign driver’s license, birth certificate
Submit in one of three ways:
- Mail to the IRS ITIN Operation in Austin with your return
- Through a Certified Acceptance Agent (recommended to avoid mailing the original passport)
- In person at an IRS Taxpayer Assistance Center

Processing timeline:

7 to 11 weeks during non-peak season
9 to 16 weeks during filing season (January to April)
ITINs issued before 2013 may need renewal; current ITINs expire if not used on a return for 3 consecutive years

Your return is filed on paper with the W-7 attached. E-file is not available until the ITIN is issued.

Children who qualify for the Additional Child Tax Credit need an SSN, not an ITIN, so ITIN children do not qualify for the ACTC.

For step-by-step ITIN guidance, see our ITIN Cost and Application.

Question 5

Does my employer's foreign location change what I have to report on my U.S. tax return?

Accepted Answer

No. U.S. citizens and green card holders report all worldwide wages on Form 1040 regardless of where their employer is located. Foreign employers do not issue W-2s, so you calculate and convert your earnings yourself and report them on Line 1 along with any U.S. earnings.

How foreign wages flow onto your return:

Gross foreign wages in U.S. dollars reported on Form 1040 Line 1a
Any foreign withholding (income tax, social security) is tracked separately
FEIE (Form 2555) or FTC (Form 1116) is applied to relieve double taxation
Self-employment tax is calculated separately if the employer is a misclassified contractor arrangement

Currency conversion:

Use the yearly average exchange rate from the IRS or a consistent monthly average
Document your method and apply it uniformly across years
Report amounts in U.S. dollars always

Because foreign employers do not issue W-2s, withhold U.S. taxes, or provide U.S.-formatted pay stubs, you are responsible for reconstructing your wage total from foreign pay slips. If you previously had a U.S. employer and are missing a W-2 from a prior year, you can request it from your old employer or file Form 4852 as a substitute. If you need to file without a W-2 entirely, use your final pay stub or foreign pay records to estimate gross wages.

What you must still track and report:

Bonuses, stock options, RSUs, and ESPP granted by foreign employers
Fringe benefits (housing allowances, cost-of-living adjustments)
Pension contributions from foreign employers (generally taxable as wages in the year credited, unless treaty-protected)

If your employer is a U.S. entity or a foreign affiliate with a Section 3121(l) agreement, you may receive a regular W-2 with FICA withheld. Otherwise, expect to build your wage total from foreign pay slips.

If you’re on a corporate assignment abroad, Greenback can help sort out the reporting.

Question 6

What counts as a primary residence for U.S. expat tax purposes, and why does it matter?

Accepted Answer

Your primary residence for U.S. tax purposes is the home where you live most of the year and treat as your main home. It determines state residency, eligibility for the Section 121 home sale exclusion ($250,000 single, $500,000 MFJ), foreign housing deductions, and mortgage interest allocation.

The IRS looks at factors including:

Where do you spend the most time during the year
Where are your belongings and personal items
Where you hold a driver’s license, voter registration, and bank accounts
Where family members live
Where utility bills and mail are sent

Why it matters for expats: Tax conceptPrimary residence impactState residencyKeeping U.S. primary residence often keeps you a state residentSection 121 exclusionMust have owned and used as primary residence 2 of last 5 yearsForeign housing deductionYour foreign primary residence unlocks Form 2555 housing cost exclusionsMortgage interestUp to 2 primary/second homes, total $750,000 debt cap (post-TCJA)FEIE tax homePrimary residence abroad supports a foreign tax home Expats with both a U.S. home and a foreign home:

Cannot have two primary residences simultaneously
Should pick which home is primary based on time, ties, and documentation
May qualify for Section 121 at sale of U.S. home if still within the 2-of-5 use window
Second home (the non-primary) gets limited deductions for mortgage interest

Declaring a foreign home as your primary residence typically helps with FEIE but may complicate Section 121 planning if you later sell the U.S. home.

For strategy on primary residence decisions, see our Buying and Selling Real Estate Abroad guide. If you own property overseas, Greenback helps foreign property owners report rental income, capital gains, and housing exclusions correctly.

Question 7

What is a dependent for U.S. tax purposes, and who qualifies?

Accepted Answer

A dependent for U.S. tax purposes is either a qualifying child or a qualifying relative meeting specific IRS tests. Claiming a dependent unlocks the Child Tax Credit, Credit for Other Dependents, Head of Household status, and other benefits on your Form 1040.

Two categories: 1. Qualifying child (all five tests must be met):

Relationship: your child, stepchild, foster child, sibling, half-sibling, step-sibling, or a descendant of any of these
Age: under 19, or under 24 if a full-time student, or any age if permanently disabled
Residency: lived with you more than half the year
Support: The child did not provide more than half their own support
Joint return: not filing a joint return with a spouse (except to claim a refund)

2. Qualifying relative (four tests):

Relationship or member of household: specific relatives listed by the IRS, or who lived with you all year
Gross income: under the annually adjusted gross income limit (check current IRS publication)
Support: You provided more than half of the person’s total support
Not a qualifying child of someone else

Expat-specific nuances:

Dependents must have an SSN, ITIN, or ATIN to be claimed
Children abroad must meet the residency test, which generally requires over half the year with you
U.S. citizen, national, or resident of the U.S., Canada, or Mexico for part of the year (exception for adopted children)

Credits tied to dependents:

Child Tax Credit: $2,000 per qualifying child under 17 with an SSN
Credit for Other Dependents: $500 per dependent (including ITIN kids)
Head of Household filing status and bracket benefits

For more on claiming dependents as an expat, see our Child Tax Credit for Expats.

Question 8

Do I have to file a U.S. tax return if my only income is foreign and I pay tax abroad?

Accepted Answer

Yes. U.S. citizens and green card holders file a Form 1040 on worldwide income regardless of source or where it was taxed. Foreign tax paid is relieved through the Foreign Earned Income Exclusion or the Foreign Tax Credit, but the filing obligation itself does not disappear just because all income was earned and taxed abroad.

Why U.S. citizenship-based taxation reaches you anywhere:

The U.S. taxes on citizenship and residency, not territory
Eritrea enforces a 2% diaspora tax on citizens abroad (U.S. Department of State), and Myanmar has taxed citizens on worldwide income since October 2023. North Korea and Cuba are sometimes cited as well, though no authoritative tax source has confirmed active enforcement of citizenship-based taxation in either country.
The obligation continues until you renounce citizenship or abandon green card status

What still eliminates or reduces U.S. tax: Relief methodBest forForeign Earned Income Exclusion (Form 2555)Low-tax country, earned income under Annual FEIE exclusionForeign Tax Credit (Form 1116)High-tax country, or unearned incomeForeign Housing Exclusion/DeductionExpensive foreign citiesTreaty provisions (Form 8833)Specific income types where treaty offers better treatment What filing always accomplishes:

Starts the statute of limitations (3 years for most issues, 6 years for major understatements)
Preserves eligibility for FEIE and FTC
Avoids late filing and failure-to-file penalties
Creates a paper trail if the IRS questions your position later

Accidental Americans and long-absent citizens who have never filed can use the Streamlined Foreign Offshore Procedures to catch up without penalties if the non-filing was non-willful.

For more on expat filing, see our U.S. Citizen Abroad Taxes guide.

Question 9

What happens if I just found out I'm a U.S. citizen and have never filed a tax return?

Accepted Answer

You should come into compliance as soon as possible, and the Streamlined Foreign Offshore Procedures (SFOP) lets you do it without penalties when your failure to file was non-willful. Many people born abroad to a U.S. citizen parent, or born on U.S. soil and raised elsewhere, discover the filing obligation years or decades late. The IRS has a clear path forward.

SFOP catch-up requirements:

File the last 3 years of delinquent Form 1040s
File the last 6 years of FBARs (FinCEN 114)
Submit Form 14653 certifying that your non-filing was non-willful
Pay any tax and interest due (often zero after FEIE/FTC relief)

What “non-willful” means in practice: ScenarioLikely non-willful?Didn’t know you were a U.S. citizenYesKnew you were a citizen but not about filingYesFiled some years, skipped others intentionallyRisky; consult a tax professionalReceived IRS notices and ignored themNo

Most first-time filers who have lived outside the U.S. their entire lives owe little or no U.S. tax after applying the Foreign Earned Income Exclusion (up to $130,000 for 2025) or the Foreign Tax Credit.

If you’re considering renunciation after becoming compliant, that involves a separate process with Form 8854 and a potential exit tax.

For a full walkthrough of who qualifies and what to expect, see our Accidental American Taxes.

Question 10

How should I approach U.S. expat tax planning to reduce what I owe while living abroad?

Accepted Answer

Effective U.S. expat tax planning starts with matching your situation to the best double-taxation relief (FEIE vs FTC), tracking foreign taxes paid, timing income and deductions strategically, and coordinating U.S. rules with your country of residence. Small structural choices often matter more than the rate differential.

Core planning moves to evaluate every year:

FEIE vs FTC decision: FEIE is simpler for low-tax countries; FTC is usually better in high-tax countries and preserves retirement contribution capacity
Foreign Housing Exclusion: stacks with FEIE to shelter additional income in expensive cities
Income timing: delay bonuses or capital gains into a year when you expect a lower U.S. bracket
Retirement contributions: only possible with FTC (or partial-FEIE) plus taxable compensation
Entity structure: U.S. LLC vs foreign corporation vs sole proprietor affects SE tax and international forms

Structural planning is worth revisiting annually: AreaQuestion to askResidencyAm I a bona fide resident under my treaty?PensionsAm I holding the right retirement vehicles? Treaty-protected?InvestmentsAm I holding PFICs? Can I switch to U.S.-listed ETFs?SE taxDo I have a totalization certificate of coverage?StateHave I properly broken state residency?Gifts /inheritanceWill upcoming foreign gifts trigger Form 3520? Documents to maintain year-round:

Day count log for FEIE
Foreign tax paid records by income category
Foreign account statements for FBAR and 8938
Receipts and records for business expenses, housing costs
Property basis records with currency conversion notes

Bringing a year-end review together with a CPA familiar with your country of residence is typically the highest-leverage move.

For a structured framework, see our U.S. Expat Tax Deductions and Credits.

Question 11

If all my income is from U.S. sources but I live entirely abroad, how does my U.S. tax return work?

Accepted Answer

If all your income is from U.S. sources but you live abroad, you file a Form 1040 as usual with U.S.-source income taxed at regular graduated rates. The Foreign Earned Income Exclusion does not apply because FEIE requires foreign-source earned income based on where services are performed, not where the client is located.

U.S.-source versus foreign-source for services:

Income is foreign-source if services are performed physically abroad, regardless of the client’s location
Income is U.S.-source only when services are physically performed in the U.S.

This means that a remote worker in Portugal, paid by a U.S. company for work performed in Portugal, has foreign-source wages, even though the employer is a U.S. company.

Truly U.S.-source income for expats usually means:

Rental income from U.S. real property (effectively connected)
U.S. Social Security benefits (source country is U.S.)
U.S. dividends and interest
Pension distributions from U.S. retirement plans
Income from work performed on U.S. trips

How the return looks:

Worldwide income on Form 1040
FEIE not available on U.S.-source income
FTC may offset U.S. tax if a foreign country also taxes the same income (treaty rules and resourcing provisions can help)
State tax possible if still a state domiciliary

For remote workers with U.S. employers: your wages are typically foreign-source because you perform the services abroad, not U.S.-source. Request that your employer update records to reflect this to support FEIE or FTC claims.

For more on sourcing rules, see our Sources of Income: U.S. vs Foreign.

Question 12

What penalties and interest do U.S. expats face for missing each tax deadline?

Accepted Answer

The penalty depends on which deadline you missed. Late payment interest starts April 15, regardless of filing extensions, while failure-to-file penalties start after October 15 (or June 15 if you didn’t extend). FBAR penalties follow a separate schedule entirely. Knowing which clock is ticking helps you prioritize.

Penalty breakdown by deadline: Missed deadlineConsequenceRateApril 15 (payment)Interest on unpaid balanceFederal short-term rate + 3%, compounded dailyApril 15 (payment)Late payment penalty0.5% of unpaid tax per month, max 25%June 15 (expat auto-extension)Failure-to-file penalty begins if no Form 4868 filed5% of unpaid tax per month, max 25%October 15 (extended filing)Failure-to-file penalty begins if still unfiled5% of unpaid tax per month, max 25%October 15 (FBAR)Non-willful FBAR penaltyUp to $16,117 per violation (2025, adjusted annually)October 15 (FBAR)Willful FBAR penaltyGreater of $129,210 or 50% of account balance How the penalties stack:

Late filing + late payment run simultaneously, but combined they cap at 5% per month (the filing penalty absorbs the payment penalty during overlap)
Interest is separate and never capped
FBAR penalties are independent of income tax penalties

Reducing the damage if you’re already late:

File as soon as possible. The failure-to-file penalty is 10x the late payment rate.
Pay what you can. Partial payment reduces the base for all percentage penalties.
Consider Streamlined Filing if you qualify for penalty abatement on non-willful failures.

For the full deadline calendar, see our Tax Deadlines for Expats. For extension options, see Form 4868: Filing an Extension.

Question 13

What is a U.S. tax year for expats, and does it match my foreign country's tax year?

Accepted Answer

The U.S. tax year is the calendar year, January 1 to December 31, for individual filers. Many countries use different tax years (the UK runs from April 6 to April 5, Australia from July 1 to June 30, Japan from April 1 to March 31), which can create timing challenges when claiming Foreign Tax Credits on income taxed at different periods in each country.

Common foreign tax years vs U.S. calendar year: CountryTax yearUnited KingdomApril 6 to April 5AustraliaJuly 1 to June 30New ZealandApril 1 to March 31JapanApril 1 to March 31 (individual is calendar)IndiaApril 1 to March 31South AfricaMarch 1 to February 28Germany, France, Canada, Mexico, SingaporeCalendar year How expats reconcile the difference:

Income: report on the U.S. calendar-year basis, converting each transaction to USD at the appropriate rate
Foreign tax paid: use the paid method (credit in the year paid) or the accrued method (credit in the year the foreign tax liability accrues), and elect consistently
Treaty resourcing: Some treaties allow resourcing provisions to align FTC timing with U.S. tax on the same income

Timing traps to avoid:

Claiming the FTC for taxes that have not yet been finalized or paid
Double-claiming an estimated tax and later the true-up
Missing a credit because the foreign tax was paid in a later U.S. year (carry forward up to 10 years, carry back 1 year)

For more on the timing of the FTC, see our Foreign Tax Credit Guide. For a country-by-country breakdown of foreign tax year dates, see our Tax Deadlines by Country.

Question 14

Can a U.S. Green Card Holder Living Abroad Stop Filing U.S. Taxes?

Accepted Answer

No, not while holding the green card. U.S. lawful permanent residents file U.S. taxes on worldwide income each year they hold the card, regardless of their physical location. To stop filing, you must formally abandon your green card by filing Form I-407 with USCIS or use a treaty tiebreaker to become a nonresident for U.S. tax purposes while retaining the card (risky for immigration status).

Three paths to ending U.S. tax filing obligations: PathTriggerImmigration impactFile I-407 abandonmentVoluntary surrender of green cardLoss of permanent resident statusUSCIS revocationAbandonment determined by USCISLoss of permanent resident statusTreaty tiebreaker electionForeign residency under treatyRisk of deemed abandonment after 8+ years holding card Expatriation tax considerations:

Green card holders who held status 8 of the last 15 tax years become long-term residents subject to the expatriation tax (Section 877A)
Mark-to-market exit tax applies if you exceed thresholds:
Form 8854 filed with the final year return to certify non-covered status or compute exit tax

Maintaining the green card while abroad:

An extended absence can trigger USCIS abandonment determinations (typically after 12+ months)
Re-entry permits can preserve status for up to 2 years
Tax compliance is independent from immigration compliance; you owe U.S. tax even while USCIS reviews your status

For more on ending green card tax obligations, see our How to Abandon Green Card.

Question 15

At What Income Level Do U.S. Expats Have to Start Filing a Tax Return?

Accepted Answer

U.S. expats must file a Form 1040 once their gross worldwide income exceeds the standard deduction for their filing status ($15,750 single, $31,500 MFJ for 2025 under the One Big Beautiful Bill Act) or once net self-employment earnings reach $400, whichever comes first. The thresholds are the same for Americans abroad as for Americans at home.

2026 filing thresholds by status: Filing status (2025 tax year)Age under 65Age 65 or olderSingle$15,750~$17,350Head of Household$23,625~$25,225MFJ (both under 65)$31,500~$32,800 (one) / ~$34,100 (both)MFS$5$5Self-employed (any status)$400 net SE earnings$400 Additional filing triggers regardless of income:

Owing special taxes (AMT, household employment, HSA distributions)
Receiving an Advance Premium Tax Credit through the ACA marketplace
Net investment income tax liability
Signature authority on foreign accounts triggering FBAR (separate from 1040 filing)

Expats should also file even below the threshold when:

You want to claim a refund of withheld taxes
You are running the FEIE clock (you must file to claim FEIE)
You want to establish an audit trail for foreign asset reporting

FBAR (FinCEN 114) is a separate filing obligation triggered at $10,000 aggregate in foreign financial accounts, regardless of whether you owe income tax.

For more on filing requirements, see our Minimum Taxable Income breakdown and our U.S. Expat Taxes guide.