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26 U.S.C. § 7701(b) / Treasury Reg § 301.7701(b)-1

Substantial Presence Test (SPT) Guide

Demystifying the IRS 183-day physical presence formula for expats, students, and foreign professionals in the U.S.

The 183-Day Weighted Presence Formula

To meet the Substantial Presence Test and become a Resident Alien, you must be present in the U.S. for at least:

  1. 31 days during the current calendar year, AND
  2. 183 days calculated over the 3-year period: 100% of current year days + 1/3 of prior year days + 1/6 of 2nd prior year days.

Exempt Individuals (F-1 & J-1 Exceptions)

"Exempt Individual" means exempt from counting physical presence days toward the Substantial Presence Test:

  • Students: Qualifying F, J, M, or Q students generally exclude days for up to 5 calendar years, subject to the IRS student exception rules. A qualifying student who excludes days generally files Form 8843.
  • J-1 / Q teachers and trainees: The general rule uses a 2-of-6-year limitation, with specific exceptions including certain foreign-employer situations. Qualifying teachers/trainees who exclude days generally file Form 8843.

Frequently Asked Questions (FAQ)

Important residency scope

The SPT is not the only federal tax-residency rule. The Green Card Test can independently make someone a resident alien, while the closer-connection exception, First-Year Choice, joint elections, and treaty residency tie-breaker rules can affect the final tax result.

This page explains the general SPT framework and related concepts; it is not a complete determination of every taxpayer's residency status.

For 2026, the SPT generally uses 100% of U.S. days in 2026, 1/3 of 2025 days, and 1/6 of 2024 days. You generally meet the test if you are present in the United States for at least 31 days during 2026 and your weighted total is at least 183 days. Excluded days and other exceptions can change the calculation, and the SPT is only one part of determining U.S. tax residency.

A person is generally a resident alien for 2026 if they satisfy the Green Card Test or Substantial Presence Test, subject to applicable exceptions and treaty rules. Resident aliens generally report worldwide income on Form 1040. Nonresident aliens generally file Form 1040-NR when required and are taxed under the nonresident rules, including U.S.-source income and effectively connected income; certain foreign-source income can also be taxable when it is effectively connected.

An exempt individual is someone whose qualifying days of U.S. presence are excluded from the Substantial Presence Test. Qualifying students under F, J, M, or Q status generally have a five-calendar-year student rule, subject to exceptions. Qualifying J/Q teachers and trainees generally use a different two-of-six-year rule and related exceptions. A person who excludes days as an exempt individual generally files Form 8843.

A person who would otherwise meet the SPT may be treated as a nonresident under the closer-connection exception if U.S. presence is fewer than 183 actual days in the current year, the person has a tax home in a foreign country, maintains a closer connection to that foreign country, has not taken prohibited steps toward lawful permanent residence, and timely files Form 8840.

A dual-status year is one in which an individual is a resident alien for part of the year and a nonresident alien for another part. If the taxpayer is resident on the last day of the year, Form 1040 is generally the Dual-Status Return with a Form 1040-NR statement attached. If the taxpayer is nonresident on the last day, Form 1040-NR is generally the Dual-Status Return with a Form 1040 statement attached.

Generally yes. A resident alien is generally taxed on worldwide income in the same manner as a U.S. citizen. Foreign financial accounts and other foreign assets may also trigger FBAR and/or Form 8938 reporting when the separate definitions, thresholds, and filing conditions for those forms are met.

Have questions about tax residency, Green Card test, Form 8843, or dual-status returns?

⬆️ Refer to FAQ Section Above
Official IRS References

• IRS Substantial Presence Test Guidelines: irs.gov/substantial-presence-test
• IRS Publication 519 (U.S. Tax Guide for Aliens): irs.gov/p519

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Worldwide Income Warning

If you are a U.S. resident alien for federal tax purposes, you are generally taxed on worldwide income. FBAR and Form 8938 reporting may also apply when their separate thresholds and definitions are satisfied. An SPT result can also be affected by other residency rules or a tax-treaty tie-breaker.

Related Tax Residency Tools
👉 Substantial Presence Test Tool →👉 Form 8840 Closer Connection →👉 Dual-Status Tax Calculator →