Someone asked me this:
A filer made an error on some previous year’s return that it turned out that your refund should have been higher (and you have documentation to back it up).
What’s the farthest back a person can go back and claim it? I had heard one time (15 or so years ago) that it was two years (that is, the error was on a return within the past two years). Anything older, and you’re SOL. The person asking that that it was as much as four years.Anything older, and you’re SOL.