Each year I input my 1099R. I receive this because after my wife's passing, i inherited this traditional IRA. There is no basis.

On 1099 worksheet I enter gross distribution, taxable amount (both same #) check box "taxable amount not determined" , code 4, check IRA box and also under inherited IRA section, check box "Spouse and not treated as own (taxable amount must be in box 2b)

Every year the program places the gross distribution on 1040 line#4b IRA taxable amount.  but the 2020 program is placing the gross distribution on 1040 line 4a and 0.00 on 4b. Can you tell me why?

This IRA distribution should be taxable

Thanks

Gary