I’m not rude . I said if it’s not W-2 work, then the applicant needs a proofs that he paid his self employed taxes. I already heard about two cases where people were asked to show the tax scrips and payments proof . One of them had 4-5 months delay in her case after the interview, because she didn’t bring it to the interview. She has a company who provide services applying for a different types of visa, green card lottery, etc , and even she didn’t know that. So I really suggest all people who are self employed / business owners considering bring this documentation just in case .