In what year did your father pass away?
Are you trying to file your father's personal Form 1040 tax return for 2017, or a Form 1041 income tax return for his estate? The estate is a separate legal entity from your father. The Form 1040 personal tax return covers his income up to the date of his death. The Form 1041 income tax return for his estate covers any income that was received after the date of his death.
A Form 1041 income tax return for an estate does not have a filing status, such as married filing jointly or married filing separately. An estate cannot be married. A Form 1041 income tax return for the estate is different from a Form 706 estate tax return.
Filing tax returns for a deceased person, or for the deceased person's estate, can be complicated. Doing it three years late makes it even harder. You should take a look at IRS Publication 559 for 2017 to get an idea of the issues, but you should probably seek professional help. If you need to file Form 1041 or Form 706 you should definitely get professional help.
If you are filing a final Form 1040 personal tax return for the year that your father died, and his wife was still living in that year, you should file a joint return for your father and his wife. His wife might have already filed a joint return for that year. If so, his tax return was filed. In that case, you do not have to do anything unless the joint return was not correct. If his wife filed with any filing status other than married filing jointly, she would have to amend the return that she filed. If she refuses to cooperate, you would have to file your father's tax return as married filing separately, but his tax will almost surely be higher that way than if he files jointly with his wife.
For a Form 1040 personal tax return, you cannot use TurboTax Online to file for 2017. TurboTax Online is only for the current tax year, which is now 2020. To file for 2017 you have to use the CD or download TurboTax software for 2017. You can purchase a download at the following link.
Past Years' Products for 2017
Tax returns for past years cannot be e-filed. You will have to print your father's 2017 tax return and file it by mail.
To file a Form 1041 income tax return for your father's estate you have to use TurboTax Business for 2017. That's a separate product from the personal software for the Form 1040 tax return. You can purchase a download of TurboTax Business at the same link above. TurboTax Business is available only for Windows. But as I said, if you have to file a Form 1041 return, I strongly recommend that you get professional help and not try to do it yourself.
Income and expenses for the sole proprietorship are reported on Schedule C included in the personal Form 1040 tax return, and in the Form 1041 tax return if there was any business income or expense after the date of death.
You cannot file a Form 706 estate tax return with TurboTax.
