My dad retired unexpectedly last year, and his Medicare premiums got hit with IRMAA fees based on his old income from two years ago. He submitted the SSA-44 form to explain his lower income, but SSA still billed him for 2023. Now, they're likely going to do the same for 2024. SSA told me the IRMAA is always set on income from two years back, no exceptions, which feels unfair. Should he just pay and wait it out, or is there a better way to appeal and get the charges lowered?