Your 2026 return may be Form 1040-NR, a dual-status Form 1040, or a resident Form 1040; the deciding facts are your countable days and whether you qualify for—and make—the first-year choice.
“I was on F1 STEM OPT until September 30, 2026, and my H1B started on October 1. I filed a 1040-NR for my previous two years as an F1 student. How should I file my taxes for 2026 given this change of status?”
Summary
Filing 1040-NR for the past two years does not lock you into it—or force a dual-status return—for 2026. You can identify the right route by counting your earlier student-exemption calendar years and your nonexempt U.S. days.
Your 2026 federal return turns on which U.S. days count toward tax residency, not simply on your October 1 visa change.
If your F-1 days through September 30 qualify as days, your countable 2024–25 days do not push you over the threshold, and you do not make an election, file **2026 Form 1040-NR** and attach **2026 Form 8843**. If you are present throughout October–December, your H-1B period contributes 92 days—short of the 183-day without earlier countable days. Your H-1B wages are not made tax-free by nonresident status. [IRS presence test](https://www.irs.gov/individuals/international-taxpayers/substantial-presence-test); [IRS nonresident filing](https://www.irs.gov/individuals/international-taxpayers/taxation-of-nonresident-aliens); [IRS Form 8843 rule](https://www.irs.gov/individuals/international-taxpayers/exempt-individual-who-is-a-student)
If you are a nonresident under the ordinary tests for **both 2025 and 2026**, meet the IRS’s 31-consecutive-day and 75%-presence requirements using **nonexempt** 2026 days, and meet the in **2027**, you can make the . If you stay in the U.S. from October 1 through December 31, your qualifying resident period can begin October 1, 2026: file a **dual-status Form 1040**, attach a **Form 1040-NR marked “Dual-Status Statement”** for the nonresident portion, the election statement, and Form 8843 for excluded student days. You cannot make the election before qualifying in 2027. The IRS page’s example uses 2025/2026; for your return, the corresponding years are 2026/2027. [IRS first-year choice](https://www.irs.gov/individuals/international-taxpayers/tax-residency-status-first-year-choice); [IRS dual-status return](https://www.irs.gov/individuals/international-taxpayers/taxation-of-dual-status-individuals)
If you used the student exemption in five earlier calendar years and do not qualify to extend it, your 2026 F-1 days generally count too. If your total passes the 2026 , file **Form 1040** rather than an ordinary Form 1040-NR. If your first countable U.S. day was January 1, that ordinarily means a full-year resident return reporting worldwide income; if residency starts later—for example, because some 2026 student days were excluded but earlier-year countable days make you pass—file a Form 1040 with the nonresident-period statement instead. [IRS five-year rule](https://www.irs.gov/individuals/international-taxpayers/exempt-individual-who-is-a-student); [IRS residency start](https://www.irs.gov/individuals/international-taxpayers/residency-starting-and-ending-dates); [IRS resident taxation](https://www.irs.gov/individuals/international-taxpayers/taxation-of-resident-aliens)
These are federal income-tax routes; Social Security and Medicare withholding follows a separate rule.
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Next steps
Use these steps to determine your 2026 federal tax status before preparing the return.
Start with your history
Count your earlier exempt calendar years
Count each calendar year in which you used the F/J/M/Q student, teacher, or trainee presence exemption, including partial years; two prior Forms 1040-NR alone do not answer this. Use the IRS rule at https://www.irs.gov/individuals/international-taxpayers/exempt-individual-who-is-a-student. If 2026 is beyond the ordinary five-year student limit, apply its stated exception only if you can establish its conditions—not simply because you remain on F-1 until September 30.
Requirements
Before selecting a form
Calculate your 2026 tax-residency days
Under https://www.irs.gov/individuals/international-taxpayers/substantial-presence-test, add countable 2026 days, one-third of countable 2025 days, and one-sixth of countable 2024 days; the test also requires 31 days in 2026 and a weighted total of 183. Exclude qualifying F-1 student days, but count H-1B days: October 1 through December 31 is 92 days if you stay throughout. If the 2026 test is met, determine the resident starting date using https://www.irs.gov/individuals/international-taxpayers/residency-starting-and-ending-dates.
Requirements
Only if electing part-year residency
Protect the deadline if you want the first-year choice
For a 2026 , you must actually meet the 2027 test before filing the elected Form 1040. If you have not met it by April 15, 2027, submit Form 4868 to the IRS by that filing deadline to request more time, as described at https://www.irs.gov/individuals/international-taxpayers/tax-residency-status-first-year-choice. The choice requires an attached statement identifying the election, your prior-year nonresidency, following-year qualification, and your presence dates; it is not automatic.
Requirements
After 2026 ends
File the matching 2026 return
If nonresident all year, file 2026 Form 1040-NR with Form 8843; the IRS permits electronic filing of 1040-NR (https://www.irs.gov/instructions/i1040nr). If resident all year, file Form 1040 (https://www.irs.gov/individuals/international-taxpayers/taxation-of-resident-aliens). If dual-status and resident at year-end, file Form 1040 marked “Dual-Status Return,” attach the nonresident-period statement—Form 1040-NR may be marked “Dual-Status Statement”—and attach Form 8843 if claiming excluded student days (https://www.irs.gov/individuals/international-taxpayers/taxation-of-dual-status-individuals). With wages subject to U.S. income-tax withholding, the ordinary deadline for the 2026 calendar-year return is April 15, 2027; the Form 1040-NR no-withheld-wages exception is June 15, 2027.
Requirements
Starting October 1
Review H-1B payroll taxes
Compare Social Security and Medicare withholding across the status change. The IRS says the employer starts withholding on the effective date of H-1B status, even when the worker remains a nonresident for income-tax filing: https://www.irs.gov/government-entities/employers-must-withhold-fica-taxes-for-aliens-who-change-visa-status-to-h1b.
Requirements
Legal sources
This answer draws on the Internal Revenue Service’s tax-residency guidance, Publication 519, and IRS form instructions.
IRS Substantial Presence Test
Tax residency uses a weighted three-year physical-presence test, rather than the visa label alone.
31 days during the current year, and 183 days during the 3-year period that includes the current year and the 2 years immediately before that, counting: All the days you were present in the current year, and 1/3 of the days you were present in the first year before the current year, and 1/6 of the days you were present in the second year before the current year.
IRS Substantial Presence Test
Qualifying student-exempt days are left out of the presence calculation.
Do not count days for which you are an exempt individual.
IRS Exempt Individual—Student
Earlier F/J/M/Q exemption years determine whether the student exception remains available in 2026, with a limited route beyond five years.
You will not be an exempt individual as a student if you have been exempt as a teacher, trainee, student, Exchange Visitor, or Cultural Exchange Visitor on an "F, " "J, " "M, " or "Q " visa for any part of more than 5 calendar years, unless you establish to the satisfaction of the IRS that you do not intend to reside permanently in the United States, and you have substantially complied with the requirements of your nonimmigrant status.
IRS Form 8843 filing rule
A student claiming excluded days attaches Form 8843 to the income-tax return.
If you are already filing an income tax return, attach Form 8843 to your income tax return.
Form 8843 (2025), instructions
The available Form 8843 instructions identify the student sections to complete.
Instructions for Students
If you qualify to exclude days of presence as a student, complete Parts I and III of Form 8843.
IRS Taxation of Nonresident Aliens
A nonresident with taxable wages uses Form 1040-NR.
Nonresident aliens who are required to file an income tax return must use Form 1040-NR, U.S. Nonresident Alien Income Tax Return.
IRS First-Year Choice
The first-year choice has two 2026 presence requirements in addition to the following-year residency test.
Be present in the United States for at least 31 days in a row in the current year (2025), and Be present in the United States for at least 75% of the number of days following the 31-day period, beginning with the first day of the 31-day period and ending with the last day of the current year (2025). (For purposes of this 75% requirement, you can treat up to 5 days of absence from the United States as days of presence in the United States.) When counting the days of presence in (1) and (2) above, do not include the days you were present in the U.S. as an exempt individual.
IRS First-Year Choice
The 2026 elective route depends on nonresidency in 2025–26 and satisfying the 2027 test.
If you do not meet either the green card test or the substantial presence test for the current year (for example, 2025) or the prior year (2024), and you did not choose to be treated as a U.S. resident for part of the prior year (2024), but you meet the substantial presence test in the following year (2026), you can choose to be treated as a U.S. resident for part of the current year (2025) and be taxed as a dual-status individual for the current year (2025).
IRS First-Year Choice
If October 1 begins the qualifying nonexempt period, that is the first-year-choice residency start date.
If you make the first-year choice, your residency starting date for the current year (2025) is the first day of the earliest 31-day period (described in (1) above) that you use to qualify for the choice.
IRS First-Year Choice
The choice requires a written statement and cannot be submitted before the following-year presence test is met.
You must attach a statement to Form 1040 to make the first-year choice. You cannot file Form 1040 or the statement for the current year (2025) until you meet the substantial presence test in the following year (2026).
IRS First-Year Choice
Form 4868 is the stated extension procedure if the next-year test is not met by the return deadline.
To request an extension to file, use Form 4868, Application for Automatic Extension of Time to File U.S. Individual Income Tax Return.
IRS Taxation of Dual-Status Individuals
A person resident at year-end files Form 1040 as the dual-status return and provides the earlier nonresident income separately.
Resident at end of year
You must file Form 1040, U.S. Individual Income Tax Return, if you are a dual-status taxpayer who becomes a U.S. resident during the year and who is a resident of the U.S. on the last day of the tax year. Write "Dual-Status Return" across the top of the return. Attach a statement to your return to show the income for the part of the year you are a nonresident.
IRS Taxation of Dual-Status Individuals
Form 1040-NR can serve as the statement attached to a dual-status Form 1040.
Resident at end of year
You can use Form 1040NR, U.S. Nonresident Alien Income Tax Return as the statement, but be sure to write "Dual-Status Statement" across the top.
IRS Residency Starting and Ending Dates
Passing the ordinary 2026 presence test can create residency from the first countable U.S. day, not necessarily October 1.
If you meet the substantial presence test for a calendar year, your residency starting date is generally the first day you are present in the United States during that calendar year.
IRS Taxation of U.S. Residents
A full-year tax resident reports worldwide income on a resident return.
This means that their worldwide income is subject to U.S. tax and must be reported on their U.S. tax return.
Instructions for Form 1040-NR (2025)
Employee wages subject to withholding ordinarily put a nonresident’s 2026 return deadline on April 15, 2027.
When To File
If you were an employee and received wages subject to U.S. income tax withholding, file Form 1040-NR by the 15th day of the 4th month after your tax year ends.
Instructions for Form 1040-NR (2025)
The later Form 1040-NR deadline applies if the taxpayer had no employee wages subject to U.S. income-tax withholding.
When To File
If you didn’t receive wages as an employee subject to U.S. income tax withholding, file Form 1040-NR by the 15th day of the 6th month after your tax year ends.
IRS Publication 519 (2025)
A calendar-year resident’s return is ordinarily due April 15 of the following year.
When To File
If you are a resident alien on the last day of your tax year and report your income on a calendar-year basis, you must file no later than April 15 of the year following the close of your tax year (but see the Tip, later).
IRS H-1B FICA Withholding
FICA withholding begins with H-1B status regardless of whether the income-tax return is 1040-NR.
The FICA tax exemption becomes inapplicable when a payee changes to H-1B non-immigrant status. Typically, the H-1B change of status becomes effective on October 1st of each year. An employer must start withholding FICA taxes on the effective date of the H-1B status change.
IRS Nonresident Spouse Election
A qualifying married couple has a separate full-year resident joint-return election.
If, at the end of your tax year, you are married and one spouse is a U.S. citizen or a U.S. resident within the meaning of Internal Revenue Code (IRC) section 7701(b)(1)(A) and the other is not, you can choose to treat the nonresident spouse as a U.S. resident for tax purposes.
These are the official IRS rules as published on the cited dates; tax rules and later form instructions can change.
This is general information about official tax processes, not legal advice, and SettleKit is not a law firm.
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