Medicare Surcharge

Good morning,

 

Is Medicare surcharge assessed on social security income as social security benefit is included in total Income?

 

Same subject - is medicare surcharge assessed on RMD as my social security benefits and RMD will be included in total income?

 

If  this is a turbo tax issue and how to ground to correct to avoid overpayment.

 

Please help me understand?

 

Thanks,