7.1 Resident vs. Nonresident Alien Status, Visas & Treaty Withholding

Resident vs. Nonresident Alien Status, Visas & Treaty Withholding

The Global sub-topic of the CPP content outline carries sixteen separate knowledge statements, more than any other lettered item on the outline, and every one of them depends on a single upstream determination: is this worker a resident alien or a nonresident alien for U.S. tax purposes? Immigration status and tax residency are different questions decided under different bodies of law. A person can be lawfully present and still be a nonresident alien; a person can be out of status and still be a resident alien.

---

1. The Two Residency Tests

A foreign national is a resident alien for a calendar year if they satisfy either the green card test or the substantial presence test.

The Green Card Test

An individual who has been lawfully admitted for permanent residence at any time during the calendar year is a resident alien from the first day of that presence, and remains one until the status is formally rescinded or judicially or administratively abandoned.

The Substantial Presence Test

+-----------------------------------------------------------------------------+
|                       SUBSTANTIAL PRESENCE TEST (IRC Sec. 7701(b))          |
|                                                                             |
|   BOTH conditions must be satisfied:                                        |
|                                                                             |
|   1. At least 31 days of physical presence in the CURRENT calendar year;    |
|      AND                                                                    |
|   2. A 3-year weighted total of at least 183 days:                          |
|                                                                             |
|      (Current-year days x 1)                                                |
|    + (First prior-year days x 1/3)                                          |
|    + (Second prior-year days x 1/6)                                         |
|    ------------------------------------                                     |
|    = weighted total; 183 or more means RESIDENT ALIEN                       |
+-----------------------------------------------------------------------------+

Worked example. An engineer was present 130 days in 2026, 180 days in 2025, and 180 days in 2024.

• Current year: 130 × 1 = 130.0
• First prior year: 180 × 1/3 = 60.0
• Second prior year: 180 × 1/6 = 30.0
• Weighted total: 220.0 days. The 31-day current-year condition is met and 220 exceeds 183, so the engineer is a resident alien for 2026 and is taxed on worldwide income exactly like a U.S. citizen.

Exempt Individuals: Days That Do Not Count

An exempt individual is not exempt from tax; they are exempt from counting days toward substantial presence.

A calendar year counts in full even if the individual held the status for a single day. The exempt individual must file Form 8843 to substantiate the exclusion. H-1B, L-1, TN, O-1, and E visa holders are never exempt individuals, so they typically become resident aliens during their first or second year in the United States.

---

2. Withholding on Nonresident Alien Wages

Nonresident alien wages for services performed inside the United States are U.S.-source income subject to graduated withholding, but with three modifications set out in IRS Notice 1392 and Publication 15-T:

1. The employee must check Single or Married filing separately in Step 1(c) of Form W-4, regardless of actual marital status. (Residents of Canada, Mexico, South Korea, and students and business apprentices from India under the applicable treaty article may claim additional adjustments.)
2. The employee may not claim exemption from withholding on Form W-4.
3. The employee writes "Nonresident Alien" or "NRA" in the space below Step 4(c).
4. Before entering the withholding tables, the employer adds the annual nonresident alien amount from the Publication 15-T table for the current year to the employee's taxable wages. This offsets the standard deduction that is built into the tables but that a nonresident alien is not entitled to claim.

[!IMPORTANT] The nonresident alien add-back is a withholding-computation adjustment only. It is not paid to the employee, is not reported as wages, and never appears in Form W-2 Box 1. Its size changes each year, so verify it against the current Publication 15-T rather than carrying it forward.

FICA and FUTA on Nonresident Aliens

The § 3121(b)(19) exemption is lost the moment the student becomes a resident alien under the substantial presence test -- typically at the start of the sixth calendar year -- which is why the exempt-individual clock must be tracked in the master file and not in a spreadsheet.

---

3. Income Tax Treaty Claims

The United States maintains income tax treaties with roughly seventy countries. For payroll, the relevant articles are those covering dependent personal services, teachers and researchers, and students and trainees. Treaty benefits are not automatic; the employee must claim them on the correct form.

Most treaties contain a saving clause that lets the United States tax its own residents as if the treaty had not entered into force. Exceptions to the saving clause -- notably for students, teachers, and trainees -- are what allow a foreign national who has become a resident alien to keep claiming a treaty article; the claim is then made on Form W-9 with an attached treaty statement rather than on Form 8233.

Treaty-exempt wages are not reported on Form W-2. They are reported on Form 1042-S using the appropriate income and exemption codes. When an employee's treaty article caps the exemption at a dollar amount, wages up to the cap go on Form 1042-S and wages above the cap go on Form W-2 for the same employee in the same year.

---

4. The Form 1042 Series

Withholding on amounts reported on Form 1042-S is deposited under the same-day, monthly, or quarter-monthly rules of Treas. Reg. § 1.6302-2, which are not the Form 941 lookback rules -- an easy place to build the wrong deposit calendar. The default withholding rate on U.S.-source fixed or determinable annual or periodical income paid to a nonresident alien is 30% unless a treaty or a statutory exemption reduces it. Chapter 4 (FATCA) reporting shares the same form.