IRMAA doesn't kick in until income is over $97K for a single and $194K for a couple. And
we don't pay into Part B or Part D from our earnings during our working years, correct? So it doesn't matter what you put in for your Part A benefit. It is a premium, based on income. Also, health insurance premiums are not based on individual risk. Your premium doesn't go up if you get cancer or have a heart attack, thankfully.
If you make $40K in retirement, you pay 4.9% of your income for Part B. At higher income levels, you pay a lower percent, roughly 2.8-3.5%. The best deal is when you have very high income-it drops to under 2%. That is regressive. So on the basis of percent of income paid, in this thread, it seems those that pay the least in terms of percent of income and who have the most leftover, are complaining the most. Am I missing something?