TurboTax cannot, legally, file a signed copy of your 1040 and transmit to the IRS a completely different copy with different information then what they give you to download as what was filed. What is on your 1040, for 2019, is what was filed with the IRS. If they were to sign one copy, than transmit a completely different copy, that is technically classified as Perjury on their part, and I don't believe that Intuit, with as big as they are, are willing to go that route, considering they own Quickbooks, TurboTax, possibly (if it hasnt happened already) Credit Karma. Whatever info is on your 2019 1040 form is what was filed, transmitted, and sent to the IRS. It is a legal copy.
