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After you file
You cannot include an attachment in a tax return that you e-file with TurboTax. When you e-file and you have an attachment for Form 8949, you print the attachment and mail it to the IRS, attached to Form 8453, which serves as a cover sheet. TurboTax will fill out the Form 8453 for you and prompt you to print it.
‎October 13, 2021
8:47 AM