The information I am linking here was published recently on medicare.gov so I assume this is it.
It can come as a surprise to some that since 2007 Medicare premiums have been based on income. (My source for the year this started was
Kiplinger.)
If you have Medicare as your primary, scroll to the bottom to click on Part B and Part D comparisons to last year.
https://www.medicare.gov/your-medica...at-glance.html