All you need is the SIMPLE transcripts from the IRS they are FREE.
The consulates tend to treat the I-134 like a mini-I-864 as so prefer the same financial evidence as the I-864.
In our case this what the I-134 included.
- I-134 signed and notarized.
- 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 125% povertyline so I did not include any asset data (LIKE BANK STATEMENTS or property values).
Again Bank Statements are not needed if income meets or exceeds 125% povertyline.