File and keep them for 3 years, along with a copy of your state and federal
returns and other documentation used in your return.
If you prefer a "paperless" option you can scan them and keep them
with a PDF copy of your return.
The IRS advises:
Keep records for 3 years from the
date you filed your original return or 2 years from the date
you paid the tax, whichever is later, if you file a claim for credit or refund
after you file your return. Keep records for 7 years if you
file a claim for a loss from worthless securities or bad debt deduction. [How long should I
keep records?]
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