Everyone who replied to this with "But what if...?": we are not talking to you. To a first approximation, literally everybody else does not have your problem -- they have W2 income and their filing status is very probably the same as it was last year. If you got married you filed a marriage license; if you had a kid your name was likely on the birth certificate. The IRS could guess everybody's taxes and be right at least 80% of the time, quite probably more like 95%. It really would be an existential threat to H&R Block, and good riddance.