AC-21
Here is the picture for AC-21;
1: You can change job after 180 days of pending I-485 and I-140 approved. Similar job.
2: AC-21 says nothing about the time after you get your GC. It is believed to be 6-12 months to prove your intention..
3: Need a layoff letter instead of just quitting.
4: There are somewhat new "memos" from USCIS about AC-21 and portability. Check "www.immigration-law.com"
http://www.immigration-law.com/
11/28/2003: AC 21 Change of Employer and Issue of Pending I-140 in Concurrent Filing
As people know, the USCIS released a memorandum on August 4, 2003 concerning the validity of I-140 under the AC 21 180-day rule. Among others, the memorandum stipulated that under the AC 21, the I-140 would remain valid if the I-485 applicant changes employment after 180 days of filing of I-485, no matter whether the employer withdraws the original I-140 petition.
Caveat: Where the I-140 is still pending in the I-140/I-485 concurrent filing after 180 days of filing of I-485, USCIS opined that the so-called Yates' memo of August 4, 2003 does not apply. This leaves a number of questions wide open in the concurrent filing where I-140 adjudication drags on.
Obviously, the first question should be whether the I-485 applicant will be allowed to change employment after 180 days of filing when I-140 is still pending. The other question is whether the I-140 petition would remain valid, should the original employer withdraw the I-140 petition for the purpose of substitution of the employee. Conservative view dictates that the answer could be "negative." The USCIS said that it would release a separate memorandum on this issue. Until such separate memorandum is released, it may be prudent for the I-485 filers to take a extra precaution before they decide to jump to a new employer.
1/28/2003: AC 21 Change of Employer and Narrow Definition of New "Employer"
Under the AC 21, the I-485 applicant is permitted to take a new "employment" of similar or same occupation classification after 180 days of filing of I-485. What is the definition and scope of "employment?" Recently, USCIS HQ opined that "self-employment" is not considered within the parameter of the terms "employment" in the AC 21. This interpretation opens a host of related questions such as what happens if the new employer is a corporation where the I-485 applicant holds controlling .....
5: The President's proposal is not going anywhere.
6: The following references describe in detail:
http://www.entertheusa.com/publications/movable_feast_aos_portability_ac21.pdf
http://www.entertheusa.com/publications/parting_is_such_sweet_sorrow.pdf
http://www.entertheusa.com/publications/a_movable_feast.pdf