With a few exceptions, if your tax return requires an attachment and/or explanation statement. you can't e-File.
You have to file a paper return via US Mail or FEDEX.
There are a few places in TurboTax where an explanation statement can be typed in by you and included with your e-File.
The only PDF supported by TurboTax is the Schedule D transacton details, and only in certain situations.
In that case, a separate paper mailing after e-File is already provided for by the IRS instructions.
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