@cep755
The IRS dictates what may be e-filed not TurboTax. The IRS only accepts certain supporting documents be mailed in after a tax return is e-filed. Please see Form 8453 U.S. Individual Income Tax Transmittal for an IRS e-file Return for the supporting documents.
For additional information, see TurboTax FAQ Do I need to mail anything after I've e-filed?
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