Your immigration forms - what each one is for and what to check before you sign
9 mins read | Oct 13, 2026
An AC21 extension keeps an H-1B employee working past the six-year limit while their green card case is still open. There are two of them, one running up to a year at a time and the other up to three years. Each is unavailable until a specific condition is met.
The situation that brings them up is familiar to anyone who keeps a sponsorship roster. A date comes up that cannot be extended the usual way. The employee is close to six years in H-1B status, and the PERM or the I-140 behind them has not finished. Knowing which of the two doors is open comes before anything else.
What happens when an H-1B employee reaches the six-year maximum period of stay
| The rule | What has to be true | What has to be filed |
|---|---|---|
| H-1B status is capped at six years | Only time physically in the U.S. counts, in H or L status combined. Time spent outside the United States can be added back | Form I-129 extension while status is still valid |
| One-year extension, AC21 section 106 | A PERM pending 365 days or more as of the six-year date, or an I-140 filed that early, with the case still open | Form I-129, plus proof of the earlier PERM or I-140 filing |
| Three-year extension, AC21 section 104(c) | The I-140 is approved and an immigrant visa is not available in the employee's category | Form I-129, plus the I-140 approval notice |
The one-year door opens because something has been pending long enough. The three-year door opens because something has been approved while the queue is backed up. HR's job is to know which one applies and to start early enough to use it.
What is an AC21 extension?
An AC21 extension is an H-1B extension granted past the six-year limit for an employee whose permanent residence case is already in motion. The authority is the American Competitiveness in the Twenty-First Century Act of 2000. It is the same Form I-129 extension, filed on a statutory basis that sits outside the ordinary six-year ceiling.
Congress added it because the two clocks run at different speeds. H-1B status expires on a fixed schedule. The employment-based preference category behind it can take far longer, especially where a category is subject to retrogression. Without AC21, an employee would lose work authorization mid-case.
AC21 also covers changing employers on an approved I-140, a separate set of rules in our guides to AC21 portability and changing jobs after an I-140 approval.
How is the H-1B 6 year limit counted?
INA 214(g)(4)sets the maximum period of admission in H-1B status at six years. Only time spent physically inside the United States counts against it, which is what makes recapture possible.
The H-1B 6 year limit is counted in days of status, not in calendar years from the hire date. Three consequences follow, and they get missed on rosters.
First, time in L-1 status counts. The six-year ceiling runs on time spent in the United States in H or L classification combined, under 8 CFR 214.2(h)(13)(iii)(A). An employee who spent three years on an L-1B before the H-1B started therefore has three years of H-1B time left. The rule runs the other way too, against the L maximums of five years for L-1B and seven for L-1A.
Second, time with a cap-exempt employer still counts. Being outside the annual cap changes how the petition is filed, not the six-year ceiling on the status.
Third, the end date moves whenever the employee was outside the country. The only reliable way to find it is to add up approved H-1B validity periods and subtract the days abroad.
What is H-1B recapture time, and what proof does USCIS want?
Recapture is the process of adding back days the employee spent outside the United States during an approved H-1B period, so those days do not count against the six years. Under 8 CFR 214.2(h)(13)(iii)(C), time spent physically outside the U.S. exceeding 24 hours during the validity of an approved H-1B petition is not counted toward the total period of authorized admission.
The days do not have to be consecutive. A week of vacation, a three-day client trip and a month working abroad all count the same way. Each absence has to have run more than 24 hours.
What takes the time is the evidence. Recapture is reconstructed from travel records. That means passport entry and exit stamps, the CBP I-94 travel history, boarding passes, airline statements, and payroll records that place the employee outside the country. Collecting four or five years of that is usually longer work than preparing the petition itself.
How long an H-1B extension takesWhat the extension timeline covers, where premium processing changes it, and what the filing window looks like.
What qualifies for an H-1B extension beyond 6 years in one-year increments?
AC21 section 106 allows an H-1B extension beyond 6 years in up to one-year increments. The condition is that a labor certification was filed with DOL, or a Form I-140 with USCIS, 365 days or more before the employee exhausts six years. The labor certification here is Form ETA-9089. A one-year grant on this basis is often called an H-1B 7th year extension.
Three details decide most cases.
- The 365 days run to the six-year date, not to the filing. The test is counted against the day the employee exhausts six years. Filing the extension later does not create eligibility that was not there.
- The labor certification has to be unexpired when the extension is filed. An approved PERM is valid for 180 days from approval. The I-140 has to be filed inside that window.
- It renews. Extensions under section 106 are granted in up to one-year increments and can be requested again while the case is still open.
If the PERM is denied, or the I-140 is denied after a one-year extension has been granted, the basis for the next extension is gone. A denial does not cancel an extension already approved, but it ends the ground for renewing it. See our guides to PERM processing time and Form I-140.
When does the three year H-1B extension and the I-140 approval apply?
AC21 section 104(c) allows H-1B extensions in up to three-year increments where the employee has an approved I-140 and an immigrant visa number is not immediately available in their category. Here is the rule as it operates:
- The I-140 has to be approved, not pending. A pending I-140 is a section 106 question, not a 104(c) one.
- An immigrant visa has to be unavailable, which in practice means the priority date not current when read against the visa bulletin.
- It can be granted more than once. USCIS guidance confirms a qualifying employee may receive more than one extension under this provision, despite the statute's reference to a one-time protection.
- No single 104(c) extension can exceed three years.
Nothing about the three year H-1B extension and the I-140 approval is automatic. The employer requests it on the Form I-129, and the category the I-140 was filed under decides which chart applies. Our guide to EB-2 or EB-3 on a PERM case covers that choice.
The condition turns on the monthly visa bulletin, so HR is reading the same chart the green card case reads. Our guides cover how to read the visa bulletin and what the final action date means, plus why a priority date stops moving.
Which extension is available, by case posture?
| Where the case stands | What is available |
|---|---|
| Nothing filed | No AC21 extension. Status ends at the six-year date |
| PERM pending, filed under 365 days ago | No extension yet. Section 106 is not met and there is no approved I-140 |
| PERM or I-140 pending 365 days or more before the six-year date | One-year extension under section 106, renewable |
| I-140 approved, priority date current | No 104(c) extension. The route forward is the adjustment or consular filing |
| I-140 approved, priority date not current | Three-year extension under section 104(c), repeatable |
When does HR have to start, counting backward from the six-year date?
The deadline that governs is not the extension filing. It is the PERM filing, because section 106 is tested against a date 365 days earlier.
Counting back from the six-year end date:
- At least 365 days before. The PERM has to be on file with DOL, or the I-140 on file with USCIS. PERM itself runs through a prevailing wage determination and a recruitment period first, and those steps add months.
- Six months before. The earliest the Form I-129 extension can be filed. Under 8 CFR 214.2(h)(9)(i)(J), an H petition may not be filed earlier than six months before the date of actual need. Our Form I-129 guide covers the filing itself.
- Eight to nine months before. Evidence collection starts. The months here are travel history and payroll records, not USCIS queue time.
An H-1B 7th year extension is therefore approved on the strength of a filing made a year earlier. Each figure above covers one leg only, and the PERM and evidence legs are where the lead time sits.
What does the Form I-129 extension cost, and can the employee keep working?
Fees current as of October 2026. Check the USCIS fee schedule before filing.
The I-129 fee is a stack, and an extension with the same employer does not carry all of it.
- Base filing fee. $780 on paper, $730 online. $460 for a small employer with 25 or fewer full-time employees, or a nonprofit.
- ACWIA fee. $1,500, or $750 for employers with 25 or fewer full-time employees. Institutions of higher education, their affiliated nonprofits, nonprofit research organizations and primary or secondary schools are exempt. It is also waived on a second or subsequent extension request by the same petitioner.
- Fraud Prevention and Detection fee. $500, and it applies only on an initial grant of H-1B status or a change of employer. A same-employer extension does not carry it.
- Asylum Program Fee. $600, $300 for a small employer with 25 or fewer full-time employees, $0 for a nonprofit.
- Public Law 114-113 fee. $4,000, for employers with 50 or more U.S. employees where more than half are in H-1B, L-1A or L-1B status. It applies to petitions filed on or before September 30, 2027.
Premium processing. Form I-907 costs $2,965 and carries a 15 business day commitment on an H-1B Form I-129. It changes the outcome in three situations. The first is a six-year date close enough that the 240-day rule will not cover the gap. The second is employee travel that needs an approval notice in hand. The third is an H-4 spouse whose work authorization depends on the principal's approval.
Our premium processing guide covers how the clock runs when an RFE is issued.
Working while it is pending. The 240-day rule sits at 8 CFR 274a.12(b)(20). An employee whose extension was timely filed for the same employment with the same employer may keep working for up to 240 days past the authorized stay. That authorization terminates on notice of a denial.
H-4 dependents. They do not extend automatically. A Form I-539 has to be filed for the spouse and children. USCIS adjudicates it with the Form I-129 when the two are packaged together and filed at the same time and place. If the spouse holds an H-4 EAD, see H-4 EAD processing time and the H-1B spouse work permit guide.
What breaks an AC21 extension?
These are the four events that change eligibility, stated as rules.
- The I-140 is withdrawn. A withdrawal filed 180 days or more after approval does not automatically revoke it for portability purposes. An I-140 that is no longer approved removes the basis for a 104(c) extension.
- The I-140 is revoked for cause. Revocation under 8 CFR 204.5 for fraud, material misrepresentation, invalidation of the labor certification or USCIS error can happen at any point.
- The priority date becomes current. Section 104(c) requires that an immigrant visa not be available. Once it is, the extension ground closes and the case moves to the adjustment or consular step.
- Employment ends. The extension is tied to the petitioning employer. A termination ends the petition, with the separate obligations set out in our employer obligations guide.
The H-1B, start to finishHow the petition, the LCA and the period of stay fit together, and where the employer's obligations attach.
How Tukki runs a sixth-year H-1B case
The two problems in this post are a date nobody found in time and an evidence file nobody started. Tukki's immigration attorneys handle both.
They reconstruct the H-1B recapture time from travel and payroll history, and confirm which AC21 extension ground applies. They file the Form I-129 with the I-539 for dependents alongside it. On the PERM side they sequence the labor certification so the 365-day test is met rather than discovered late.
HR sees every sponsored employee's six-year date and next deadline in one view, which is how the date gets found eleven months out instead of eleven weeks out. For how the permanent case is built behind the extension, see our guides to the employer-sponsored green card and H-1B to green card.
The sixth year can be read off the roster today. Everything that makes an extension possible has to be filed long before it arrives.