Withdrew more RMD than needed. How do you enter difference?

You can safely withdraw more than your RMD. You do not enter the difference in TurboTax.

Enter your form 1099-R and continue the TurboTax interview. Answer that Only part of this distribution was an RMD, then on the following page, to the question What is the RMD for your account? enter the amount of the RMD (which is smaller than the distribution amount).

By doing this, you are telling TurboTax that all RMDs are satisfied and TurboTax will not calculate any penalty. The information you entered in TurboTax is to enable TurboTax to calculate any penalty where applicable, and is not reported to the IRS.