you made me curious and I logged into the IRS to find those "transcripts". I really cannot tell if they generate that information from your own tax report or if they generate it from what they already got in their own databases.
> Wage and Income Transcript - shows data from information returns we receive such as Forms W-2, 1099, 1098 and Form 5498, IRA Contribution Information. Current tax year information may not be complete until July. This transcript is available for up to 10 prior years using Get Transcript Online or Form 4506-T.