If the taxpayer has date of death then the e file must contain the letters and symbol DECD.
The tax application automatically inserts this information into the e file. The field is limited to 35 characters. You typically see this reject if the last names of the taxpayer and spouse are different. You should start by removing middle initials, shorten the spouse first name to the first initial and shorten the taxpayer name to first initial. If you have to shorten the last name, the IRS does name control on the first four letters of the last name.
This information applies to all years of the UltimateTax software.