Hi. An estate executor or a personal representative, who is often a relative of the deceased, can sign the tax return. An attorney, or any other person who is primarily responsible for handling the deceased's financial affairs can also sign the return.
See page 4 of this IRS link:
https://www.irs.gov/pub/irs-pdf/p559.pdf
" If a personal representative has
been appointed, that person must sign the return.
If it is a joint return, the surviving spouse
must also sign it. If no personal representative
has been appointed, the surviving spouse (on a
joint return) signs the return and writes in the
signature area “Filing as surviving spouse.” If no
personal representative has been appointed
and if there is no surviving spouse, the person
in charge of the decedent's property must sign the return as the personal representative."
You
can complete a descendant's final return using TurboTax, and you will be directed how to prepare and sign it.
