H-1B Beyond Six Years: The Two AC21 Extensions Explained

Your H-1B clock says six years. Your green card case says otherwise.

If you are an EB-2 or EB-3 applicant from a backlogged country, or your PERM is still sitting at the Department of Labor after your fifth anniversary on H-1B status, the six-year limit is not actually a wall. It is a trigger for one of two specific extension mechanisms written into the American Competitiveness in the Twenty-First Century Act, commonly called AC21.

These two provisions, Section 104(c) and Section 106(a)/(b), solve different problems. Confusing them, or filing the wrong one at the wrong time, is one of the more common and avoidable mistakes consultants and their employers make in the back half of an H-1B career.

This is general information, not legal advice. Confirm the facts of your own case, including dates, filing history, and category, with a licensed immigration attorney before relying on any of it.

Two Different Problems, Two Different Fixes

Section 214(g)(4) of the INA caps H-1B status at six years. AC21 created two separate escape valves for people who are already deep into the green card process when that cap arrives.

• Section 104(c): the I-140 is approved, but no immigrant visa number is currently available because of per-country or category backlogs. This is the situation most EB-2 and EB-3 applicants born in India or China face.
• Section 106(a)/(b): a PERM labor certification or an I-140 petition has been pending for at least 365 days, regardless of whether it has been approved yet. This covers people whose process is simply slow, not necessarily backlogged by country.

A consultant can qualify for one, the other, or neither, depending entirely on where their green card case stands. Neither extension has a limit on how many times it can be renewed, as long as the underlying conditions keep being met.

The Three-Year Extension Under AC21 104(c)

Section 104(c) applies when an I-140 immigrant petition has been approved on the consultant's behalf, but a visa number is not yet available under the Department of State Visa Bulletin for their chargeability country and preference category.

In practice, this is the provision used almost universally by EB-2 and EB-3 applicants born in India, and frequently by those born in China, because approved I-140s in those categories routinely sit for years waiting on priority dates to become current.

Key points:

• The I-140 must actually be approved. A pending, unadjudicated I-140 does not qualify a case for 104(c); it may qualify for 106(a)/(b) instead.
• Extensions under 104(c) can be requested in increments of up to three years at a time, a meaningful difference from the one-year increments allowed under 106(a)/(b).
• There is no cap on the total number of 104(c) extensions. A consultant can keep renewing every three years for as long as their priority date remains behind the Visa Bulletin cutoff.
• The extension is tied to the specific approved I-140. If that petition is later withdrawn or revoked, 104(c) eligibility generally goes with it, unless a new approved I-140 is in place.

The One-Year Extension Under AC21 106(a)/(b): The 365-Day Rule

Section 106(a)/(b) is the provision people usually mean when they refer to the 365-day rule, and it should not be confused with the separate 240-day rule governing automatic extension of work authorization while an H-1B extension petition is pending with USCIS. That is a different mechanism covered elsewhere; this one is about eligibility for status beyond year six in the first place.

Under 106(a)/(b), a consultant qualifies for a one-year extension if, at the time the extension is filed, at least 365 days have passed since:

• A labor certification application (PERM, Form ETA-9089) was filed with the Department of Labor on their behalf, and that labor certification remains pending or has been approved but the I-140 has not yet been filed or approved; or
• An I-140 immigrant petition was filed with USCIS on their behalf.

The underlying case does not need to be approved to support a 106(a)/(b) extension. It only needs to have been filed at least 365 days before the extension request, and the process needs to still be moving forward on the consultant's behalf.

This is the extension that keeps a lot of people in status through a slow PERM audit or a long I-140 adjudication queue, well before any question of per-country backlog even arises.

104(c) vs. 106(a)/(b) at a Glance

Filing Timing That Preserves Eligibility

The 365-day clock in 106(a)/(b) is unforgiving. Miss it and there is no extension available under that section until a fresh 365-day period has run on a new filing. A practical timeline looks like this:

1. Year 1-2: Employer identifies the green card category (EB-2 or EB-3) and begins the PERM process, including the prevailing wage determination and required recruitment.
2. Year 3-4: PERM is filed with the Department of Labor. This date starts the 365-day clock for 106(a)/(b) purposes.
3. Year 4-5: I-140 is filed once PERM is certified. If the I-140 is later approved, it may support a 104(c) three-year extension once a visa number shortage appears on the Visa Bulletin.
4. Before the 6-year anniversary: the H-1B extension petition (Form I-129, H classification) is filed, citing 104(c) or 106(a)/(b) as the basis, with evidence of the PERM or I-140 filing date and, if applicable, the I-140 approval notice.

Because the whole point of 106(a)/(b) is a filing date at least 365 days in the past, starting PERM as early as reasonably possible, well before year five, is the single most reliable way to avoid a gap. Employers who wait until year five to initiate PERM often find the math no longer works by the sixth anniversary.

What Happens If the Underlying Case Is Denied or Withdrawn

Both mechanisms are only as strong as the case underneath them.

• PERM denied: the 106(a)/(b) clock tied to that filing stops. A refiled PERM starts a new 365-day count from its own filing date.
• I-140 denied: eligibility under 104(c) ends immediately, since that section requires an approved petition. Eligibility under 106(a)/(b) tied to that same I-140 also ends, though a new PERM or I-140 filing can start a fresh clock.
• I-140 withdrawn by the employer: the effect on future extensions depends on timing, reason, and whether the petition had already been approved. This area has real nuance and case-specific exceptions, so verify the current treatment with your attorney before assuming either outcome.
• Change of employer: a new sponsoring employer generally needs its own PERM and I-140 (or must rely on portability rules under a different AC21 section) before 104(c) or 106(a)/(b) can be used with the new petition.

None of these outcomes are automatically fatal to a green card case, but each one resets or removes a specific extension pathway. Knowing which section your current status rests on, and what keeps it alive, is the difference between a routine renewal and a scramble.

For current form numbers, filing fees, and the latest USCIS Policy Manual guidance on both sections, confirm directly at uscis.gov before filing.

The team at Josh Pros LLC works with consultants navigating exactly this stretch of the H-1B timeline, where sponsorship status, PERM timing, and extension strategy all intersect. If you want to talk through where your case stands, reach out at contact@joshpros.com or visit https://joshpros.com.

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This is general information, not legal advice. Immigration rules change and outcomes depend on your individual circumstances. Confirm anything that affects your case with a licensed immigration attorney.

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