Correct, only thing needing to be notarized.
Also bank letter is only needed if you need to include the balance of your account as an asset to meet 125% povertyline.
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.
- Tax transcripts from the IRS for past 3 years, (Redundant for the (1040,W2,1099) but are free from the IRS
- Photo copy of IRS form 1040, and W2s for past 3 years
- Letter from my employer stating annual salary, job responsibility, and that is full time, on company letterhead.
- Photo copies of past 6 months 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.