Section 418.1101 - What is the income-related monthly adjustment amount?(a) The income-related monthly adjustment amount is an amount that you will pay in addition to the Medicare Part B standard monthly premium plus any applicable increase in that premium as described in 42 CFR 408.22 for your Medicare Part B coverage when your modified adjusted gross income is above the threshold described in § 418.1105 .(b) Your income-related monthly adjustment amount is based on your applicable modified adjusted gross income as described in § 418.1115 and your tax filing status.(c) We will determine your income-related monthly adjustment amount using the method described in § 418.1120 .