Is it necessary to provide the portion of a regular monthly payment from a retirement plan that is an RMD? TurboTax has never (in 20 years) asked this question?

You should have received a Form 1099-R for your required minimum distribution (RMD). Enter it like any other 1099-R.  As long as the amount of the distribution is at least the RMD amount, you don't have to do anything special.

 

After you finish entering the 1099-R, continue through the TurboTax screens. You will come to a screen that asks you if the distribution was an RMD.

 

Your 1099-R issuer is required to follow RMD rules and regulations, so if you received a distribution and you're at least 70 1/2 years old, you can be almost certain you received an RMD. Check with your plan administrator if you're still not sure.

 

See also this help.

The monthly payment you get from a pension plan is all RMD.
It has to be.

Look at it this way, if you got less you'd be complaining right?