Same or Similar Occupation Test for H-1B Portability (2026)
AC21 portability (changing employers while I-485 is pending 180+ days) requires the new job to be in the same or similar occupational classification. Getting this analysis right is critical.
What Is the Same or Similar Occupation Test?
Under AC21 Section 204(j), you can change employers while your I-485 (adjustment of status) is pending for 180+ days if the new job is in the same or similar occupational classification as the PERM labor certification job offer. USCIS uses SOC codes, job duties, required education, and experience to make this determination. The test is more flexible than it sounds — 'similar' is broadly interpreted to include occupations in the same SOC family or requiring comparable skills.
Same vs Similar Occupation: The USCIS Analysis
Same occupation: same SOC code as the PERM job description. This is the safest scenario — no ambiguity. Similar occupation: different SOC code but comparable duties, required education, and skill sets. USCIS evaluates: nature of the work, level of education required, skill requirements, industry context, and compensation level. Moving from SOC 15-1252 (Software Developer) to 15-1299 (Computer Occupations, All Other) is typically similar. Moving from SOC 15-1252 (Software Developer) to 11-2021 (Marketing Manager) would not be similar.
How to Document AC21 Portability
When changing employers while I-485 is pending, the new employer should provide: (1) AC21 letter from employer describing the new position's duties and how they align with the PERM job, (2) New employer's offer letter, (3) SOC code determination for the new role, (4) If not same SOC — a written analysis of why the occupations are similar. File this package with USCIS either proactively (if USCIS inquires) or in response to an RFE/NOID during I-485 adjudication. Do not wait for USCIS to ask — have the documentation ready.
When the Test Fails: Same Employer, Different Role
A frequently misunderstood scenario: changing job duties significantly at the same employer while I-485 is pending. If you change from the PERM-certified occupation to a materially different role, even at the same employer, you may fail the same or similar test — even though you did not change companies. The test compares the actual new position against the PERM job description, not the employer relationship. A software developer promoted to a management-only role with no coding may fail the test.
Frequently Asked Questions
What qualifies as same or similar occupation for AC21?
USCIS looks at whether the new job is in the same SOC code or a SOC code that shares comparable duties, required education, and skills. The determination is fact-specific. Generally: moves within the same SOC major group are same or similar. Moves across SOC major groups require more analysis. For example, all software engineering roles within the 15-XXXX SOC family are typically similar to each other.
Can I change from software engineering to product management on AC21?
This is a gray area. SOC codes 15-1252 (Software Developer) and 11-2021 (Marketing Manager/Product Manager) are in different SOC families. USCIS may or may not accept this as similar depending on the specific duties of each role. A technical product manager role requiring CS degree and engineering background has a stronger case than a purely business-focused PM role. Get a written AC21 analysis from an immigration attorney before making this move.
How long does I-485 need to be pending for AC21 portability?
I-485 must have been pending for at least 180 days (6 months) from the date USCIS received it. The 180-day clock starts from the I-485 receipt date, not the I-140 approval date. You can change employers immediately after 180 days — there is no requirement to wait for additional time.
What happens if USCIS challenges my AC21 portability claim?
USCIS may issue an RFE or NOID questioning whether the new occupation is same or similar. Respond with a detailed occupational comparison analysis, supporting O*NET/DOT data on job duties for both occupations, the new employer's confirmation letter, and any expert opinion from an immigration attorney. AC21 portability challenges are winnable with strong documentation.