Most people will pay the standard monthly Part B Premium . However, as of January 1, 2007, some people will pay a higher premium based on their modified adjusted gross income. Your monthly premium will be higher if you file an individual tax return and your annual income is more than $85,000, or if you are married (file a joint tax return) and your annual income is more than $170,000. These amounts change each year. For the 2019 premium amount in your income range, see Your 2019 Monthly Premiums for Medicare.
If you file an individual tax return and your income is above $85,000, or if you are married and file a joint tax return and your income is above $170,000, Social Security will use the income reported two years ago on your IRS income tax return to determine your premium (if unavailable, SSA will use income from three years ago).
For example, the income reported on your 2017 tax return will be used to determine your monthly Part B premium in 2019. If your income has decreased since 2017, you can ask that the income from a more recent tax year be used to determine your premium, but you must meet certain criteria. At the end of each year, Social Security will send you a letter if your Part B premium will increase based on the level of your income and to tell you what you can do if you disagree.