Because TurboTax is an ERO. The ERO is the Authorized IRS e-file Provider who originates the electronic submission of a return to the IRS. An ERO can only offer tax forms that meet the IRS e-file schema requirements whether e-filed of mail filed - it is the same form.
Providers do not have separate or different forms for e-file or mail file.
https://www.irs.gov/e-file-providers/ero-technical-fact-sheet
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
