For each 401k (if you have more than one) the RMD must be calculated for and taken from that account.
For IRAs, add the total value of all accounts (Traditional, SIMPLE, SEP), the RMD can be taken from any one account or account(s) as you wish.
If your traditional IRA is an individual retirement annuity,
special rules apply to figuring the required minimum distribution.
for a pension , TurboTax asks the confusing question. Answer YES.
@rosm2004
For tax year N, the RMD is calculated based on the previous year's Dec 31 value
