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I'm thinking of taking my rmd in Dec. that would be equal or greater than the years tax liability.
No, an RMD is not a substitute for quarterly payments, and RMD is a distribution from your deferred account, it is not a tax payment. To avoid late payment penalties, you have to make quarterly payments on or before the due date for each. Just making one large payment at the end of the year doesn't satisfy the requirements.
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