Per the IRS form 1040 instructions page 76
If your return is signed by
a representative for you, you must have
a power of attorney attached that specifically
authorizes the representative to
sign your return. To do this, you can use
TurboTax does not support the 2848 form but it can be downloaded from the IRS site.
You would have to physically sign a paper return and mail with the attached POA.
Suggest that you read IRS Pub 559 (Survivors, Executors, and Administrators) for a lot of good information about filing the final return and estate return and other requirements.
<a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-pdf/p559.pdf">https://www.irs.gov/pub/irs-pdf/p559.pdf</a>
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