User guide
What is the AC21 portability checker?
The AC21 portability checker calculates the 180-day point for an employment-based I-485 and reviews core same-or-similar job and I-140 conditions. It is a screening tool, not a duties analysis.
How it works
- 1
Enter the I-485 receipt or filing date shown by USCIS.
- 2
Confirm that the I-140 is approved or approvable absent an independent ground for denial.
- 3
Compare duties, skills, SOC codes, pay, and career progression, not just job titles.
Official sources and methodology
These references come from official U.S. government websites. Check the source for current rules and forms.
Frequently asked questions
Can I take any job after 180 days?
No. The new position generally must be in the same or a similar occupational classification, reviewed across duties, skills, SOC, pay, and other evidence.
Can AC21 apply before I-140 approval?
In some cases I-140 may remain pending, but it must be approvable absent an independent basis for denial. The record must be reviewed carefully.