I think that's how it works. The Medicare premium is based on your MAGI. My friend cashed in some of her Savings Bonds and her Medicare increased from the $134 up to 186.
See, <a rel="nofollow" target="_blank" href="
https://www.medicare.gov/your-medicare-costs/part-b-costs/part-b-costs.html">https://www.medicare.go...>
