When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS and/or your state received the return.
If you are also filing a state return, make sure you do not put the federal and state returns in the same envelope. They go to separate places.
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