H-1B AC21 Extensions: How to Stay Work-Authorized After Year Six

Many professionals assume H-1B status ends after six years, but AC21 can allow one-year or three-year extensions beyond that limit.

Who qualifies for an H-1B extension past year six?

You may qualify if:

• A PERM labor certification or I-140 has been pending for at least 365 days.
• You have an approved I-140 but cannot file adjustment of status because your priority date is not current.
• Your employer files the extension on time with strong supporting evidence.

One-year vs. three-year AC21 extensions

A one-year extension is commonly based on a qualifying filing pending 365+ days. A three-year extension is often available when the I-140 is approved and immigrant visa numbers are unavailable.

Common mistakes that cause delays or denials

• Miscalculating the 365-day rule.
• Missing evidence linking you to the qualifying case.
• Filing too late and creating work authorization risk.

Practical planning tips

Track expiration dates at least six months early, confirm the underlying immigrant case remains valid, and prepare backup travel/work plans while the case is pending.

A proactive filing strategy can preserve continuity of employment and reduce disruption for both employee and employer.