user: There are several things that I need explained about medicare premiums. Perhaps you can help me?[NEWLINE]agent: Of course. The law requires an adjustment to your monthly Medicare Part B medical insurance and Medicare prescription drug coverage premiums. This affects less than five percent of people with Medicare. Most people don t pay higher premiums.[NEWLINE][BOUNDARY][NEWLINE]user: What role does my tax return play in this?[NEWLINE]agent: Do you want to know how we determine your 2020 income-related monthly adjustment amounts?[NEWLINE]user: Sure. Go ahead.[NEWLINE]agent: We use your most recent federal tax return the IRS provides to us. Generally, his information is from a tax return filed in 2019 for tax year 2018. Sometimes, the IRS only provides information from a return filed in 2018 for tax year 2017.[NEWLINE]user: What if I amended my tax return?[NEWLINE]agent: In that case you should let us know. We count and it changes the income to determine the income-related monthly adjustment amounts your MAGI.[NEWLINE]user: *doesn't make sense*[NEWLINE]agent: *doesn't make sense*[NEWLINE][BOUNDARY][NEWLINE]user: What would influence my income-related monthly adjustment amount?