What kind of documents should we compile to show our source of funds?

Those documents offer a promising start but, until you seek out a full consultation, it will be hard to say if they are enough. They may be sufficient if you also provide your income (minus living expenses). I would recommend a full consultation before moving forward, though.

Since you have already submitted your EB-5 petition on Form I-526, you will soon find out whether the documents you provided were sufficient to show a lawful source of funds. Assuming your bank statements for the last 6 months and/or your tax receipts show that you have accumulated sufficient funds, that may well be sufficient. You will have to wait to see whether or not you receive a Request for Evidence as to whether more documentation is required.

It is very unlikely that a mere 6 months of bank statements, your practice documents, and a receipt of your paid taxes would be sufficient. Of course, if you earned a huge amount of money in that period, it may make a difference. However, you also have to deal with a path of funds issue, meaning you need to show how that money made its way into the investment project. Finally, since there are Treasury restrictions on Iranians, you need to be sure to comply with all the Treasury Department sanctions.

Those documents could be enough. Another part of the SOF is the path of funds. This means you have to document a clear path between your accumulated income and the investment to the project.

Given the somewhat rough relationship between the United States and Iran, as well as AML/OFAC regulations in the U.S., you will likely need to show that the funds for your investment were not derived from transactions with a sanctioned or banned bank (or persons) in Iran, among other things. You would be wise to work with a U.S. law firm with both OFAC and immigration experience to make sure your application is on the right track.

There is no definitive list of documents, but what you have listed seems sufficient. As long as you show that you had enough capital from your income/business earnings/savings and, perhaps evidenced by your bank statements, that you transferred the money for the EB-5 investment from your bank account.

USCIS can and will require proof of where you got the money you have in the bank. If you have deposits from your salaries of $1million in the last six months, then it should be fine.