If you have to mail something, look in your return for Form 8453 - it will show you anything (if anything) that needs to be mailed.
If you received a request to submit Form 8453 (US Individual Income Tax Transmittal for an IRS e-file return), you need to mail some forms to the IRS that can't be e-filed.
TurboTax creates Form 8453 for you, and it serves as a cover page for your additional documentation. 8453 Help
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