A higher-than-expected first Medicare bill can be a surprise for many people. This often happens because the bill covers more than just one month's premium or includes additional surcharges or penalties.
It's important to keep in mind that how much you pay for Medicare overall will depend on how much you earned two years before you sign up. If you earn over a certain threshold, you will pay a monthly surcharge on top of your Part B and Part D premiums; this is called the IRMAA, or the income-related monthly adjustment amount. This surcharge is based on your tax return from two years ago. It's a good idea to take note of your income from two years prior when you fill out your Medicare application; it can help you estimate whether or not you might be liable for this extra charge.
