@bcr08081
You don't need to, it's just the gross total.....the box 1 value.
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For any actual monthly pension you are receiving,, it's just the gross total for the year.
You only have to calculate an RMD yourself, is for retirement accounts where you must initiate the RMD payment yourself......Like for TSP, IRA and 401k accounts. Those you must contact the Provider of those and have them send you the RMD each year once you reach age 73. (Some providers will calculate the RMD for you at the time you take your RMD, but you have to ask)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*