{"data":{"id":"us/20-cfr-418.1230","jurisdiction":"us","citation":"20 CFR 418.1230","heading":"What is the effective date of an income-related monthly adjustment amount initial determination that is based on a more recent tax year?","body":"(a) Subject to paragraph (b) of this section, when your modified adjusted gross income for the more recent tax year is significantly reduced as a result of a major life-changing event, our initial determination is generally effective on January 1 of the year in which you make your request. If your first month of enrollment or reenrollment in Medicare Part B is after January of the year for which you make your request, our initial determination is effective on the first day of your Medicare Part B enrollment or reenrollment.\n(b) We will make a determination about your income-related monthly adjustment amount for the year preceding the year that you make your request in the limited circumstances explained in § 418.1310(a)(4). When we make a determination for the preceding year, our initial determination is generally effective on January 1 of that year. If your first month of enrollment or reenrollment in Medicare Part B is after January of that year, our initial determination is effective on the first day of your Medicare Part B enrollment or reenrollment.\n(c) Our initial determination will be effective January 1 of the year following the year you make your request, when your modified adjusted gross income will not be significantly reduced as a result of one or more of the events described in § 418.1205(a) through (g) until the year following the year you make your request.","path":["Title 20—Employees' Benefits","CHAPTER III—SOCIAL SECURITY ADMINISTRATION","PART 418—MEDICARE SUBSIDIES","Subpart B—Medicare Part B Income-Related Monthly Adjustment Amount"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-20.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:45Z","sha256":"19ec0600b670e8fb7617c57053e97a809815d19db0bc82083b1ef79ff85fe36b","source_id":"us-cfr","stale":true,"prev":"us/20-cfr-418.1225","next":"us/20-cfr-418.1235"},"notice":"GroundRules: Original legal text. Not legal advice."}