IRS Publication 519, U.S. Tax Guide for Aliens, is the Internal Revenue Service’s official guide explaining how U.S. federal tax rules apply to noncitizens (“aliens”). The publication defines who is a resident or nonresident for tax purposes, explains the tax treatment of different types of income, describes special categories (dual-status aliens, exemptions, treaty benefits), and points to the forms noncitizens must use to report and pay U.S. tax.
Key takeaways
– Residency for tax purposes matters: resident aliens are taxed on worldwide income like U.S. citizens; nonresident aliens are taxed only on U.S.-source income and certain U.S.-connected income. (Pub. 519)
– Residency is usually determined by the green card test or the substantial presence test (SPT). (Pub. 519)
– Nonresident aliens face two main types of U.S. taxation: effectively connected income (ECI) taxed at graduated rates and FDAP (fixed or determinable, annual or periodic) income taxed at a flat 30% (unless a treaty or a statutory exception applies). (Pub. 519)
– Nonresident aliens generally file Form 1040-NR. Resident aliens file Form 1040. Dual-status and special elections (e.g., treating a nonresident spouse as a resident) create additional filing rules. (Form 1040-NR; Pub. 519)
Where to read the official rules
– IRS Publication 519, U.S. Tax Guide for Aliens:
– About Form 1040-NR, U.S. Nonresident Alien Income Tax Return
Core concepts explained
1) Residency tests
– Green card test: You are a resident for tax purposes if you were a lawful permanent resident (had a green card) at any time during the calendar year. (Pub. 519)
– Substantial presence test (SPT): You meet the SPT if:
• You were physically present in the U.S. at least 31 days during the current year, and
• The sum of: (a) all days present in the current year, (b) 1/3 of days present in the previous year, and (c) 1/6 of days present in the second previous year equals 183 days or more.
• Example: If you were present 120 days this year, 120 days last year, and 120 days the year before, weighted sum = 120 + 40 + 20 = 180 (so you would not meet the SPT). (Pub. 519)
2) Exceptions to counting days
Certain categories of individuals may be “exempt” from counting days toward the SPT for limited periods. Common examples include:
– Individuals on certain student (F, J, M, Q) or teacher/researcher visas (J or Q) who meet exemption rules;
– Certain medical professionals temporarily present to provide medical care;
– Professional athletes temporarily in the U.S. to compete in a charitable sports event.
Details and duration limits are in Pub. 519—always check the publication for your visa type.
3) Dual-status and spouse election
– Dual-status aliens: If you qualify as both resident and nonresident in the same year (e.g., you became a resident mid-year), you are generally a dual-status alien. Filing rules differ: you typically file Form 1040 for the resident portion and Form 1040-NR for the nonresident portion, subject to specific instructions. (Pub. 519)
– Married couples: A nonresident spouse may sometimes be treated as a resident for the whole year if both spouses choose to be treated as residents (an election). That election has consequences: worldwide income of both spouses becomes taxable in the U.S. for the year of election; it is often used when it reduces overall tax or simplifies filing.
4) Taxation of nonresident income: ECI vs FDAP
– Effectively Connected Income (ECI): Income effectively connected with a U.S. trade or business (e.g., wages from work performed in the U.S., business profits) is taxed on a net basis at the graduated income tax rates the same as U.S. residents. Nonresidents may claim deductions attributable to that income. (Pub. 519)
– FDAP (Fixed or Determinable Annual or Periodical) income: Passive U.S.-source income such as interest, dividends, rents, royalties, pensions and certain other payments are typically taxed at a flat 30% withholding rate. That rate can be reduced or eliminated by an applicable income tax treaty. FDAP is generally taxed on a gross basis (no deductions against it). (Pub. 519)
– Portfolio interest and other statutory exceptions may be exempt from FDAP withholding—see Pub. 519 and IRS guidance.
5) Tax treaties
Many countries have income tax treaties with the U.S. that can reduce or eliminate U.S. tax on certain types of income (e.g., personal services, pensions, royalties, dividends, interest, capital gains). Treaty benefits must be claimed correctly (often on Form 1040-NR or via withholding forms such as Form W-8BEN). Treaties may also have residency tie-breaker rules. Always check the specific treaty text for the country involved. (Pub. 519)
6) Filing forms and identification numbers
– Nonresident aliens generally file Form 1040-NR (U.S. Nonresident Alien Income Tax Return). (Form 1040-NR)
– If you are required to file but don’t have a Social Security number (SSN), you must obtain an ITIN (Individual Taxpayer Identification Number) with Form W-7, unless eligible for an SSN. Apply for an ITIN well before filing to avoid delays. (IRS ITIN information)
– Nonresidents whose only U.S. income is wages subject to U.S. income tax withholding may still have filing requirements (e.g., to claim refunds or treaty benefits).
Practical step-by-step guide (what to do, in order)
Step 1 — Determine your tax status for the year
– Gather travel records (I-94 records, passport entry/exit stamps, airline itineraries) and compute days present in the U.S. for each of the last three years.
– Apply the green card test. If you were a lawful permanent resident anytime during the year, you are a resident for tax purposes.
– If no green card, apply the SPT calculation. Subtract days that qualify for an SPT exception (see Pub. 519).
– If you have mixed status during the year, determine whether you are dual-status and whether any elections (e.g., spouse election) apply.
Step 2 — Classify your U.S. income
– Identify each source: wages (US employment), business income, rental income, dividends, interest, pensions, royalties, capital gains.
– Decide whether each income item is ECI (effectively connected) or FDAP (passive US-source) using Pub. 519 guidance.
Step 3 — Check for treaty benefits
– Find whether your country has a tax treaty with the U.S. and read relevant articles for personal services, pensions, interest, dividends, and capital gains.
– Determine documentation required to claim treaty benefits (typically Form 8233 or Form W-8BEN for withholding, or claim on Form 1040-NR).
Step 4 — Obtain identification and withholding documentation
– If you need an ITIN, file Form W-7 well before filing your tax return.
– Provide correct withholding forms to payers (Form W-8BEN for nonresident beneficial owners, Form 8233 for personal services treaty exemptions, or Form W-9 if you are a U.S. person).
Step 5 — Prepare and file the correct tax return(s)
– Nonresident who is nonresident for full year: file Form 1040-NR.
– Resident for whole year: file Form 1040 (and follow resident rules).
– Dual-status: follow Pub. 519 instructions (may require Form 1040 for resident portion and Form 1040-NR for nonresident portion; special rules for standard deduction and personal exemptions apply).
– Attach treaty statements, forms W-7 (if applying for ITIN with return), and required documentation.
Step 6 — Pay tax and claim refunds/credits
– For ECI, pay tax on net income according to graduated rates. For FDAP, tax is typically withheld at source; if over-withheld you may claim a refund on Form 1040-NR.
– Consider available credits (limited for nonresidents) and treaty provisions.
Checklist of documents to gather
– Passport, visa pages, I-94 arrival/departure records
– Entry/exit dates (airline itineraries)
– Green card or immigrant documentation (if applicable)
– W-2, 1099, 1042-S, K-1s, and other income statements
– Records of foreign income and tax paid (for treaty or credit purposes)
– Forms W-8BEN, W-8ECI, or 8233 if provided to payers
– Prior-year U.S. tax returns (if any)
Common pitfalls and tips
– Don’t assume visa = nonresident. The tax residency test is separate—check the SPT and green card test. (Pub. 519)
– Missing days or miscounting exemptions can change your status and tax obligations significantly—keep meticulous travel records.
– Treaty benefits are not automatic. You usually must claim them and provide paperwork to payers or on your tax return.
– Withholding at 30% on FDAP is common—if you expect a lower treaty rate or allowance for deductions, file timely to get refunded later if withheld too much.
– State tax rules differ from federal rules—check the relevant state revenue department if you lived or worked in a state.
When to get professional help
– Complex situations: dual-status year, choosing spouse election, substantial business income connected with the U.S., conflicting residency under tax treaties (tie-breaker rules), or significant foreign-source income.
– If you need to manage treaty claims, dual-status returns, or complicated withholding issues, a tax advisor experienced in international tax is advisable.
References and further reading
– IRS Publication 519, U.S. Tax Guide for Aliens:
– About Form 1040-NR, U.S. Nonresident Alien Income Tax Return:
– Investopedia: “IRS Publication 519” summary
– Help you compute the substantial presence test if you provide entry/exit dates.
– Review a short list of your U.S. and foreign income to suggest which taxes and forms likely apply.
– Provide a sample checklist or template for an ITIN application or Form 1040-NR filing.