My case is that on my traditional IRA, all contributions for last several years are non-deductible. I did all ROTH conversion on 2021.
On step 1, I put 2021 contribution and the base from all previous years.
On step 2, I modify 2a (1099-R) to the taxable amount. All others are as you suggested.
The result is that the whole distribution is taxed.
But if I uncheck IRA/SEP/SIMPLE box, the result seems reasonable, but it is not correct based on your step.
Could you do online support? I can show you my case.
By the way, my friend has premier version, we do the same way, but his result seems good.
