I played around with this because I will be in the same situation next year with RMDs from multiple accounts. I agree with you that TT should only ask what your total RMD is after you have entered all the distributions from your multiple accounts.
But TT doesn't appear to want to do it logically. Instead, they ask for the RMD separately on each account. What seems to work is this (given as an example):
Suppose you have $10,000 in one account and $15,000 in another account. Let's say your RMD divisor factor is 25, so that your total RMD is (10,000 + 15,000) / 25 = $1,000. But you decide to take $100 out of account #1 and $900 out of account number 2, meaning that you have satisfied your RMD. When TT asks for your account #1 information, simply put in $100 as your RMD. When TT asks for your account #2 information, put in $900 for your RMD. These RMD numbers are, of course, a lie - but then you avoid TT computing a penalty on account #1.
The IRS only cares that your total RMD has been met and you have correctly reported your 1099-R income. I don't know why TT makes things this cumbersome. I suspect there are millions of people with multiple retirement accounts that mix distributions to arrive at the correct total RMD.
Just my opinion (I could be wrong).
