I-864 directions specify what is needed, required is at least US Citizen's past year (2007) IRS return or a simple IRS transcript.
In our case this what the I-864 for AOS included.
- I-864.
- SIMPLE Tax transcripts from the IRS for past 3 years, (Redundant for the (1040,W2,1099) but are free from the IRS http://www.irs.gov/faqs/faq1-6.html
- Photo copy of IRS form 1040, and W2s for past 3 years (Not necessary if you provide the transcripts)
- Letter from my employer stating annual salary, job responsibility, and that is full time, on company letterhead.
- Photo copies of past month or so of pay stubs up to a few weeks before the interview.
My income was well above the povertyline so I did not include any asset data (LIKE BANK STATEMENTS or property values).
If your income is well above 125% povertyline, then you could use I-864EZ, (This is for Income Only, No joint sponsor, and only One immigrant)