I am 81, still work full time, contribute to 401k. must I take required annual minimum distribution?

[DanaB27]

No, you might not have to take your Required Minimum Distribution (RMD) from the 401k plan if your plan allows it. But if you have a traditional IRA then you will have to take the RMD from that account.

Generally,  for 401k plans you must start taking an RMD on "April 1 of the year following the later of the year you turn 72 (70 ½ if you reach 70 ½ before January 1, 2020) or the year you retire (if allowed by your plan). If you are a 5% owner, you must start RMDs by April 1 of the year following the year you turn 72 (70 ½ if you reach 70 ½ before January 1, 2020)."(IRS)

[dmertz]

If you are a greater than 5% owner of the company providing the 401(k), you must take RMDs.