Is there a four-year limit on F-1 admission? Not today. What the postponed rule would mean

There is no four-year limit on F-1 admission today. F-1 students are admitted for duration of status (D/S): for as long as you pursue a full course of study, plus any authorized practical training, plus a 60-day grace period. The four-year figure comes from a DHS final rule that would have replaced D/S with fixed-date admissions on September 15, 2026. A federal court postponed that rule on September 14, 2026, and it is not in effect. This page covers today's rules first, then how the four-year limit would work if the rule takes effect. 8 CFR 214.2(f)(5)(i), (f)(5)(iv); 91 FR 44976

What applies today

• No fixed maximum. Your I-94 shows "D/S." A five- or six-year PhD stays in D/S the whole way, as long as you maintain status and make normal progress. 8 CFR 214.2(f)(5)(i), (f)(7)(i)
• No USCIS extension filing. An F-1 student admitted for D/S is not required to apply for an extension of stay. If you can't finish by the program end date on your I-20, your DSO can grant a program extension, but you must ask before that date. The DSO can grant it only for compelling academic or medical reasons (a change of major or research topic, unexpected research problems, documented illness), not for academic probation or suspension. 8 CFR 214.2(f)(7)(i), (iii), (iv)
• Arrival timing. You can be admitted up to 30 days before the program start date on your I-20. That window is longstanding law, not part of the new rule. 8 CFR 214.2(f)(5)(i)
• One existing cap. A student admitted to attend a public high school is limited to 12 months of study in aggregate. That limit predates the rule. 8 CFR 214.2(f)(5)(i)
• Forms. USCIS continues to accept the 08/28/24 edition of Form I-539 and is not accepting the 09/15/26 edition built for the rule. F-1 students do not need an I-539 extension of stay. USCIS alert on uscis.gov/i-539

Your I-20 dates still matter. The program end date starts your 60-day grace period and your OPT filing window, and a program extension has to be requested before it passes. Read it carefully, and if it looks short for how long you will really take, raise it with your DSO early. 8 CFR 214.2(f)(5)(iv), (f)(7)(iii), (f)(11)(i)(B)(2)

What the postponed rule would change

Status: postponed nationwide by court order on September 14, 2026 (Presidents' Alliance on Higher Education and Immigration v. DHS, No. 1:26-cv-13799, D. Mass., under 5 U.S.C. § 705). Next court date: October 2, 2026. This page is updated when that changes.

Everything in this section describes the final rule as published at 91 FR 44976 (July 17, 2026). None of it applies today. 91 FR 44976

How the fixed period would be measured. A student admitted after the effective date would get a period of stay matching the program length on the I-20, up to four years. Three details would carry most of the weight: 8 CFR 214.1(a)(4), 214.2(f)(5)(i), as amended

• The clock would run from the I-20 program start date, not your entry date. A student whose program starts August 25, 2027 would have a four-year boundary anchored to August 25, 2027, whether they land two weeks early or arrive late after visa delays.
• Shorter programs would get shorter admissions. A two-year master's I-20 would yield roughly a two-year admission. Four years would be a cap, not a grant.
• A 30-day period after the program would be included on the I-94. It would be a departure period, not extra status.

English-language training would be capped at 24 months. 8 CFR 214.2(f)(5)(i)(A), as amended

Students in the U.S. on the effective date, admitted for D/S, would stay under transition rules while they remained in the country; one departure and re-entry would convert them to the fixed-date system. See the overview and the travel guide. 8 CFR 214.1(m)(1), as amended

Why the I-20 dates would matter more. Today an I-20 end date is an estimate your DSO can extend in SEVIS. Under the fixed-date system, the I-20 program dates would become the admission, because the I-94 would be built from them. For DSOs and admissions offices, program-length decisions on the I-20 would function as admission-period decisions. 8 CFR 214.2(f)(5)(i), as amended

Extensions through USCIS. A student who needed time beyond the admission would file Form I-539 with USCIS: 8 CFR 214.2(f)(7), as amended

• The package: I-539, a DSO-endorsed I-20 recommending the extension, and evidence of funds. Biometrics may be required.
• The fee: $420 online, $470 on paper, per the USCIS fee schedule (Form G-1055).
• The deadline: USCIS would have to receive the filing before the authorized stay ended. An extension filed during the 30-day departure period would permit study only, not work, while pending.
• While pending: a timely filing would give authorized stay, and on-campus, CPT and economic-hardship work would continue for up to 240 days. CPT continuation would also cap at the DSO's CPT end date. 8 CFR 214.2(f)(5)(viii), as amended; 91 FR 44976
• The grant: up to four years per extension, with approval not guaranteed. A six-year PhD would be a four-year admission plus one extension, if approved.

Departure periods. The 30 days on the I-94 would replace the 60-day grace period for fixed-period students. Early completion would also carry 30 days, an authorized withdrawal 15, a status violation none, and the OPT filing window would close 30 days after program end. See the grace-period guide. 8 CFR 214.2(f)(5)(v), (f)(11)(i)(B)(2), as amended

Program-change limits. Graduate students could not change major or program level during a program, and could transfer only under an SEVP extenuating-circumstances exception. Undergraduates could not transfer or change program objective during their first academic year. A student who completed a program could not begin a new one at the same or a lower educational level. DHS reserved authority to delay these provisions until September 14, 2028. 8 CFR 214.2(f)(5)(ii), as amended

A worked example, if the rule takes effect. A PhD student's I-20 shows a program starting September 1, 2027 with a five-and-a-half-year expected length. The initial admission would be capped at four years from September 1, 2027, through September 1, 2031, plus the 30-day period on the I-94. Comfortably before that date, the student would file an I-539 with a DSO-endorsed I-20 and funding evidence. Received on time, it would authorize their stay while pending and extend on-campus assistantship work up to 240 days. If granted, it could cover up to four more years. Under today's rules, the same student is simply admitted for D/S and, if needed, gets a DSO program extension before the I-20 end date. 8 CFR 214.1(a)(4), 214.2(f)(7), (f)(5)(viii), as amended; 8 CFR 214.2(f)(7)(iii) (current)

As published, the rule counts its transition dates from its original September 15, 2026 effective date. If the postponement ends, check how DHS applies those dates at that time; this page will say.