The year you sponsor an immigrant changes a couple priorities. First, it's not a year to delay filing your tax return. Second, it's not a process where you think about how little you can get away with doing. You do all you can. Not doing so can delay the process by months. Once they ask for something that isn't there, there's no visa until you provide it, and it goes through another queue to be reviewed. Depending on the Consulate, this would add 1 or MORE......months to the process.