Since TurboTax step-by-step mode does not have a way to separately enter this basis acquired from your deceased spouse, you'll either have to enter it directly on the IRA Info Wks in forms mode or simply combine it with your own basis when answering the questions in step-by-step mode regarding your basis. Don't do both since TurboTax automatically combines the lines 23-32 in Part V and the lines 61-72 in Part VI to come up with the values on lines 51 through 60.
