It depends. If you e-filed you
don’t have to send in any forms in unless you was instructed to do so. However,
there are some situations where you might have to mail something after
e-filing, for example if your return contains Form
8453. If you
completed a paper return, you would need to
include copies of your W-2 and any forms that show income tax withheld. Also, make sure you sign your return because it will not be valid unless your
signature is on it.
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