robi:
Everybody provides their 2 cents claiming that ONLY W2 is valid for using AC21.
OK, now here's my 2 cents:
I've asked several people on this forum whether they can provide written proof (INS/CIS Memo or Web Page) that only W2 is valid, and believe me, NOBODY has been able to provide that.
We were in a similar situation where we were working on 1099. If you notice the RFE text, it asks for W2/1099, which clearly means that one can work on 1099 since EAD allows you to work as an independent contractor/consultant.
My opinion is that as far as possible, to avoid any CIS hassles, it's better to work on a W2. But if that's a problem even a 1099 should be OK, at least it's better to be employed than not. IRS (not INS) has a 20-point rule about employee-employer relationship. If push comes to shove, if you can prove that an employee-employer relationship does exist then your 1099 is considered equivalent to W2. The implications are that your employer is going to be mighty pissed off since they would need to shell out their share of FICA (Medicare & SS taxes). While working on 1099 they don't pay a dime of FICA, so they save a ton of $$. Anyway, hope you get the gist.