FICA deduction after transitioning from F1 to H1B
I changed from F-1 STEM OPT to H-1B effective Oct 14, 2026. My Oct 3–16 pay period included 7 F-1 workdays (70%) and 3 H-1B workdays (30%), paid Oct 23. My employer says the entire paycheck is FICA-taxable because payment occurred after my status change. However, IRC §3121(c) provides a 50% included/excluded services rule. Does this rule apply to F-1/H-1B transitions, allowing the entire pay period to remain FICA-exempt? Or is FICA due on the full paycheck?
Quick Answer:
IRC §3121(c), the "Included and Excluded Service" rule, generally does **not** apply to the transition between F-1 and H-1B status for the purpose of extending a FICA exemption to the entire pay period.
The FICA exemption for F-1 students under IRC §3121(b)(19) is contingent upon the individual being a **nonresident alien** for tax purposes. Once your status changes to H-1B, you are no longer in a visa category that qualifies for the §3121(b)(19) exemption.
The IRS generally views the timing of the "taxable event" as the date the wages are constructively received (the pay date). Because you were in H-1B status on the date of payment (Oct 23), the employer is technically correct that the payment is subject to FICA.
Furthermore, §3121(c) applies when an employee performs both "included" and "excluded" services for the *same employer* during a pay period. However, the F-1 exemption is based on the **individual's legal status**, not the nature of the specific "service" performed. Most practitioners and the IRS maintain that the exemption ends the moment your immigration status changes. Therefore, FICA is due on the full paycheck.
Note: This answer is provided for convenience only. It is important that you speak to a CPA about your individual tax situation.
