CRLLS
Thinks s/he gets paid by the post
Medicare B premium is the same for everyone, $164.9 this year. Medicare supplemental plan prices, or MediGap, vary widely around the country. You can use the MediGap plan finder at the Medicare website here https://www.medicare.gov/medigap-supplemental-insurance-plans/#/m/?year=2024&lang=en
Enter yiur zip code and look at the plans available in your area.
For the vast majority of people, you are correct. For those with large AGI (SS, RMDs etc), IRMAA can close to $400 more. And IRMAA also increases Part D (drug). IRMAA is a graduated scale so there is no large "cliff", just a series of smaller steps.