On a foreign student's admission record, where the expiration date goes, there are two letters: D / S. On September 15 they become a real date — with a four-year ceiling and a filing behind it.

Pull up the I–94 for any international student your clients enroll or employ and look at the admit until line. For nearly half a century it has said the same thing: D/S — duration of status. Not a date. A condition. Stay as long as you are genuinely a student, and the clock never really starts.

On July 17 the Department of Homeland Security published a final rule that ends that. Starting September 15, 2026, nonimmigrants in F status (academic students), J status (exchange visitors), and I status (foreign media) will be admitted for a fixed time period — the length of the program, not to exceed four years — instead of D/S. It is a major rule under congressional review, so DHS can shift the date; the default is eight weeks out.

Here is what actually changes at the desk. When the fixed period runs out and the program is not finished, the student must file for an extension of stay — a Form I–539 with USCIS, with a fee and biometrics — the way most other visa holders already do. An F–1 who files on time may keep studying while USCIS adjudicates. An F–1 who files late does not. And a student who lets the date pass without filing stops accruing lawful presence and starts accruing unlawful presence.

That is the whole risk in one sentence. The statute’s unlawful-presence bars are not proportional to the mistake: more than 180 days unlawfully present, then departing the country, triggers a three-year bar on return; more than a year triggers ten. Under D/S a paperwork slip was rarely fatal, because there was no date to miss. A fixed date is a thing you can miss.

Neither number existed for F and J students in June. Both are calendar events somebody now has to own.

So here is my read, and it is the one I gave every campus counsel and every employer on our roster this week. This is not a student’s problem to remember. It is a calendar problem, and the calendar belongs to whoever is responsible for the filing — the DSO, the HR team running OPT and STEM OPT, and us. A four-year program admitted for four years has no slack. A semester abroad, a medical leave, a dissertation that runs one term long, and the program end date on the I–20 arrives before the diploma does. Every one of those now needs an I–539 in the pipeline months early, not a shrug.

And read the fine print, because that is where people get hurt. Graduate students lose the ability to change educational objective or transfer schools mid-program without an SEVP exception. Language-training students are capped at an aggregate 24 months. The window to leave after completion drops from 60 days to 30. None of that was the law in June.

Kept honest: this is a final rule, but a major one subject to congressional review — DHS states that if the effective date changes it will publish a new date or terminate the rule, so September 15 is the default, not a lock. The three- and ten-year bars are the INA’s existing unlawful-presence provisions (section 212(a)(9)(B)), not new numbers invented here; what is new is how much easier a hard date makes them to trip. Every figure — the four-year cap, the 24-month language-student limit, the 60-to-30-day change, the 240-day employment auto-extension — is quoted from the rule as published July 17, 2026. None of this is legal advice; each case turns on its own facts and its own counsel.

Sources (primary, verified today): DHS final rule, “Establishing a Fixed Time Period of Admission and an Extension of Stay Procedure for Nonimmigrant Academic Students, Exchange Visitors, and Representatives of Foreign Information Media”, 91 FR 44976, published July 17, 2026, effective September 15, 2026 (RIN 1653–AA95, docket ICEB–2025–0001). The Federal Register HTML and text are WAF-blocked; the govinfo PDF (FR-2026-07-17/2026-14439) was fetched and text-extracted during this run, and every quoted figure — the fixed period “up to the program length, not to exceed a 4-year period,” the 60-to-30-day departure change, the 24-month language cap, the 240-day employment auto-extension, and the I–539 extension procedure — is taken verbatim from that text. The three- and ten-year reentry bars are INA § 212(a)(9)(B), cited in the rule’s unlawful-presence discussion.

For nearly fifty years, a foreign student's admission record has not carried an expiration date. In the box where a date goes, it says D/S — duration of status. Stay as long as you're genuinely studying, and the clock never really starts.

That ends September 15.

DHS published a final rule on July 17 replacing duration of status for F (students), J (exchange visitors) and I (foreign media) with a fixed admission period: the length of the program, not to exceed four years. Run past it and the student has to file a Form I-539 extension with USCIS — fee, biometrics, the works — the way most other visa holders already do.

Here's the part I keep repeating to campus counsel and employers: this is not a student's problem to remember. It's a calendar problem, and the calendar belongs to whoever handles the filing — the DSO, the HR team running OPT, and us.

Because the downside isn't a late fee. A student who lets the date pass without filing starts accruing unlawful presence, and the INA's bars are brutal: 180+ days then departure is a three-year bar, a year is ten. Under D/S there was no date to miss. Now there is.

Three things worth doing before the 15th:

— Pull the program end date off every F and J client's I-20 or DS-2019 and calendar an I-539 for anyone who runs long.
— Tell employers the admission clock and the work-authorization clock are now two clocks, not one.
— Find the students whose plans are changing — transfers, level changes, medical leaves — because for grad students the rule closes several of those doors.

Also in the fine print: the post-completion departure window drops from 60 days to 30.

Source: DHS final rule, 91 FR 44976, "Establishing a Fixed Time Period of Admission...", published July 17, 2026, effective September 15. Every figure is quoted from the rule text.

FIRST SOURCE · one verified original-source finding, composed for one reader · this edition: immigration-law firms — written for the attorneys advising universities, employers of F-1/J-1 workers, and the students themselves