Yes. There is a space on the form for the intending immigrants income and assets.
For proof- Well you are self employed. Im assuming you keep 'books'. I mean you have to have spreadsheets tracking your income. If you do not then simply make them now. Its a little different with self employment income. You will need to show you have been self employed for a min of 1 year. This is established by having a tax return. In the US taxpayer system there is a special form (schedule c) that self employed people use. Do you have something similar there? Do your taxes state anything useful? Start with that and build off it. If your taxes for 2015 show 114k in earnings then your spreadsheets should show amounts totalling to 114k. (Im not sure what your wifes US tax returns show but they also have to be included so maybe theres something there)
You also should send an 'employment letter'. This is a simple straightforward letter addressed to whomever is reviewing it explaining what you do, how you are paid, how long youve been doing it, education, training etc. This is where you really want to sell yourself pushing the point the income will continue and is stable. If you have pending contracts in the future or active accounts submit proof of that.
everyones situation is going to be different so its impossible to give you a checklist of what you should send. Some people need banking records because of how they are paid. Some people need proof of contracts. It really depends on what you say you do and what you can come up with to prove it. Anything you say try to find proof of. Just remember the more documentation you have the better. Ive known people that even included a copy of their business card lol.
There are also many threads on the forums about this topic. Try using the search feature to find some of the threads. Good luck!
Doesn't matter that that he works from home. All that is needed is most recent tax year return. You will be just fine as long as he can support you 125% above poverty line as evidenced by most recent tax return.
