At a minimum, you should gather two months’ worth of statements for all of your bank and investment accounts, 30 days’ worth of paystubs, your last two W-2s and 1099s, your last two tax returns, your drivers’ license, and Social Security card. If you have a divorce decree or bankruptcy papers, your lender will request those as well. Check out this article for a more extensive list of the documentation lenders can ask for.