What would cause a customer's Part B payment to go down?

[axeman462]

I have a customer that gets a $150/mo Part B premium refund every month.
He is in a higher income bracket, and was paying $93/mo for his Part B premium

He recently signed up for Social Security. And, when they started taking the Part B premium out of his SS, they are now only taking out $80/mo

What would cause the difference in in payment?

 

[Chazm]

IRMMA part b for him is $230.80 plus part d irmma $12.20. Minus the $150 part b giveback comes to $93

edit: just saw that you said it’s now $80. He may have had a credit if he over paid before. I’d advise him to create an account at my Medicare.gov to check out his Medicare premium.