OPT Tax Filing for International Graduates

Why Social Security and Medicare should not be on your OPT pay slip

This is the most common error on an OPT pay packet and the easiest to check. The exemption from Social Security and Medicare tax depends on two things holding at the same time: you are a non-resident alien, and you are in F-1 status with the employment authorised as part of that status. OPT satisfies the second. Whether you satisfy the first depends entirely on whether your five exempt calendar years are still running.

Payroll systems almost never assess this. A new-hire onboarding form captures a work authorisation document and a tax withholding election; it does not ask which calendar year of exempt status you are in. So the default behaviour is to treat you like any other employee, and the deductions appear.

• Check boxes 4 and 6 on your Form W-2. Box 4 is Social Security tax withheld and box 6 is Medicare. On a correct OPT year where you remain exempt, both should be empty.
• Ask the employer first. An employer who withheld in error can correct it and refund you directly, and that is materially faster than claiming from the IRS.
• Failing that, it is claimed from the IRS with a refund claim and supporting documentation rather than on the tax return itself.
• Confirm your status before assuming the withholding was wrong. If your exempt years are already used up, you are a resident for tax purposes, FICA is correctly due, and there is nothing to recover.

The recovery process itself — what to file, what evidence an employer statement needs, and how far back a claim reaches — is set out on our FICA tax refund page. This section is about establishing whether you have a claim at all, which is the step people skip.

The STEM extension is usually where the exempt clock runs out

A STEM OPT extension adds 24 months on top of the 12 months of post-completion OPT. For a graduate who did a bachelor's in the US as well, or who took a master's after a few years of study, those extra two years are very often what carries them past five calendar years of exempt status. The extension is an immigration benefit and changes nothing about tax by itself. What changes everything is the passage of time it permits.

Because the count is by calendar year rather than by elapsed months, the flip happens on 1 January rather than on an anniversary — and there is no notification, no new document, and nothing on the pay slip that marks it.

The right-hand column is where the real cost sits, and it has nothing to do with your US salary. NRE interest is genuinely tax-free in India, which is why almost nobody expects it to be taxable anywhere — and it becomes ordinary interest income on a US resident return. Indian mutual funds held through a demat account are almost always PFICs, reported under a regime designed to be unattractive. Neither of these is a problem while you are exempt, and both arrive together on the day you are not.

This is the single most useful thing to know in advance rather than in April, because some of it can be arranged differently before the year turns and none of it can be arranged differently afterwards.

Cap-gap keeps you in F-1 status, and that has a tax consequence

If your employer files a timely H-1B change-of-status petition while your OPT is still valid, the cap-gap provisions extend your F-1 status — and, where applicable, your work authorisation — past the date your OPT would otherwise have ended. Under the DHS rule effective January 2025 that extension runs until your approved H-1B start date, or 1 April of the relevant fiscal year, whichever comes first. Guidance published before 2025 says the period ends on 1 October, and that is now out of date.

The tax consequence is straightforward and frequently missed: throughout the cap-gap period you are still in F-1 status. If your exempt calendar years have not run out, the exempt-day treatment and the Social Security and Medicare exemption continue for that whole period. The correct point at which FICA starts is the date your H-1B status begins, not the date your OPT card expired and not the start of the fiscal year.

In practice this produces a specific payroll error worth checking for. An employer who treats the old OPT end date as the switch-over point begins withholding FICA weeks or months early, and every one of those pay periods is a wrongly withheld amount. Your Form W-2 for that year will show it as a single annual figure, so the only way to find it is to compare the withholding against the date your status actually changed.

Whether you qualify for a cap-gap extension at all is an immigration question, not a tax one. Your designated school official and an immigration attorney are the right people for that. We work from the status and dates you actually have.

The year OPT becomes H-1B: what most preparers assume wrongly

The common assumption is that an October H-1B start makes that year a dual-status year. For someone coming off OPT with exempt years still remaining, that is usually not the default outcome, and getting it wrong in either direction changes the tax.

Work it through. Your F-1 and OPT days are exempt, so they do not count. From an H-1B start on 1 October there are 92 days left in the year, and if your earlier years were exempt too there is nothing to add from them. The substantial presence test needs 183 days on the weighted count. It is not met — so by default you are a non-resident for the whole of that year and you file a full-year Form 1040-NR.

What creates the dual-status year is an election, not the calendar. The first-year choice lets you be treated as a resident from a chosen date, and it requires 31 consecutive days of presence in the year plus presence on at least 75 per cent of the days from the start of that 31-day period to the end of the year. It also requires that you are a resident under the substantial presence test in the following year, which is why the election frequently cannot be made by April and needs an extension to make it at all.

The row that decides it for Indian filers is the standard deduction. Article 21(2) gives a student or business apprentice from India the standard deduction on a non-resident return — and a dual-status return generally denies the standard deduction on the resident portion. So the election that looks like an upgrade can produce more tax, not less. Which way it falls depends on how much of the year you worked on OPT, what the H-1B salary was for the final quarter, and whether you have Indian income that residency would pull into scope.

This is a calculation, not a rule of thumb, and it is worth doing in December rather than in April. Both treatments should be computed on your actual numbers before either is chosen.

Where this comes from

• IRS — Foreign student liability for Social Security and Medicare taxes
• IRS — Substantial presence test
• IRS — Residency starting and ending dates, including the first-year choice
• IRS — Dual-status individuals
• IRS — About Form 843, Claim for Refund and Request for Abatement
• IRS — Publication 519, US Tax Guide for Aliens
• USCIS — Extension of post-completion OPT and F-1 status under the H-1B cap-gap regulations