This is true. They would have to send you a simple form to ask you for those things. Or change the way those things are reported. But fun fact, ~80% of tax returns could be calculated by the IRS with no input from the taxpayer, based on the actual returns that they get now. In other words, 80% of returns don't have any information they don't already know. That's mainly because most taxpayers have a single W2 income and just take the standard deduction.
Although you're wrong about the mortgage interest deduction, that is reported by the bank per address, and you have the list your primary address with your state tax authority, which the IRS gets a copy of.
Although you're wrong about the mortgage interest deduction, that is reported by the bank per address, and you have the list your primary address with your state tax authority, which the IRS gets a copy of.