Now that you've filed your taxes --- hopefully! ---
maybe you're wondering what records you should keep,
and for how long. Generally, you should keep such
records as Forms W-2 and 1099, documenting income,
for at least three years after the date your return
was due. And you should keep records relating to
stocks, mutual funds and other property you own so
that you can document gain or loss when you sell.
But if you fail to file a return, or file a
fraudulent one, the IRS could request records going
back forever, with no statute of limitations. For
more details, link to IRS Publication 552, entitled
"Recordkeeping for Individuals," at
http://www.irs.gov/pub/irs-pdf/p552.pdf