If you are on Medicare, but have high income, the law requires an upward adjustment to your monthly Medicare Part B (medical insurance) and Medicare prescription drug coverage premiums. The “means-tested” increased premiums apply when your income is more than $85,000 for single taxpayers and $170,000 for joint taxpayers. While this only affects 5 percent of people with Medicare, here are a few tips to know about the surcharges, including some ideas to avoid them:
http://www.kiplinger.com/medicare-surcharges-have-costly-effects
Additionally, click here for a PDF of the Medicare Premiums: Rules For Higher-Income Beneficiaries (2017) booklet from the Social Security Administration.