Solved
When I e-file with the IRS, do they get a pdf?
What type of file extension is e-filed?
No, The IRS has their own software program and all forms are switched over to match the IRS software. You can read about the IRS Master File and the many languages used and for which areas. Many languages are used, COBOL, JAVA, and so on.
On your personal file with Turbo Tax, a .data file is used.
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