In most cases, you know the information (and may have to file) before they’ve processed it. Request your tax account transcript (what they know about your accou

In most cases, you know the information (and may have to file) before they’ve processed it. Request your tax account transcript (what they know about your account) on April 15 and again on August 15. I can pretty well guarantee they’ll be different for the prior calendar year. It might be stuff they’ll eventually know, but it’s not necessarily stuff they already know at the relevant time.