Some plans allow participants to postpone RMDs until April 1 of the year after they retire, even if they retire after age 70½

Employees of public schools and certain tax-exempt organizations with 403(b) plan accruals before 1987 should check with their employer, plan administrator or provider to see how to treat these accruals.
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Please check with plan administrator.

However, if this plan is from a prior employer, you do need to take the RMD.