Are There Any Disadvantages to Concurrent Filing?
Possibly. If your I-140 is denied, the AOS application will naturally be denied as well. Thus, the concern is a financial one. The main causes leading to a denial of I-140 petitions is lack of qualifications on the part of the beneficiary (mainly an issue for EB1 preference petitions) and lack of proof that the sponsoring employer has the financial ability to continue to pay the offered salary to the beneficiary (mainly an issue for smaller, younger, and/or unprofitable companies).
