The IRS is accepting Efiled returns with a 1099-R.
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Then return to your 1099-R entry, and go through the entire section to review your entries. There are follow-up questions after your entry.
It may there is something on your 1099-R entry that is directing you to mail your return. If you can give more details about the message you receive when trying to Efile, we'll try to help.
Here's how to Contact TurboTax Support for more help.
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