1099R Death of spouse
My wife died in 2023 after taking her full IRA RMD. I rolled her IRA into my own and then took my RMD. For her form 8606, I carried over her basis from her 2022 return and used the date of death account value as the year end value of her IRA. How do I get her remaining basis into my IRA? Do I calculate her 2023 end of year basis and add it to my basis from 2022 when Turbotax asks for my basis or do I wait until I do my 2024 return and then add her basis to my basis? How do I do either of these?