Medicare guide
Learn what Medicare IRMAA is, why Social Security may add it to Part B or Part D costs, what notices to keep, and when a lower amount may be requested.
IRMAA stands for Income-Related Monthly Adjustment Amount. Social Security may determine that an additional amount applies to Medicare Part B, Part D, or both.
IRMAA thresholds and adjustment amounts can change. This guide explains the durable process and points you to the agencies that make the determination instead of reproducing a table that may become stale.
Reviewed for accuracy by Medicare Saving Solutions. Last updated . Next review due September 15, 2026.
Key takeaways
Use the topics and related links below to keep learning about Medicare at your own pace.
Guide
IRMAA is an additional premium amount for some people with Medicare Part B or Part D. It is separate from a plan premium and does not change the medical or prescription benefits a plan covers.
The exact thresholds and adjustments are time-sensitive. Use the current Medicare cost information and the notice from Social Security for the year being reviewed.
Social Security determines whether IRMAA applies and sends the initial determination notice. The notice explains the determination and includes information about appeal rights.
Keep the notice with your Medicare and tax records. A plan or insurance agency does not replace Social Security as the decision-maker for IRMAA.
A Part B IRMAA is added to the Part B premium. A Part D IRMAA is an additional amount associated with Medicare drug coverage and is separate from the premium charged by the drug plan.
Because Part B and Part D are different parts of Medicare, a notice may address one or both. Review every line of the notice rather than assuming a drug plan premium explains the full amount.
Social Security says a person who has had a qualifying life-changing event that reduced household income can ask to lower the additional amount. Examples listed by Social Security include marriage, divorce, death of a spouse, and certain losses of income.
The request process may require a form and supporting evidence. Use Social Security's current instructions and do not send tax or financial documents to an insurance agency for this purpose.
Confirm the notice is from Social Security, identify whether it addresses Part B, Part D, or both, and compare it with current Medicare cost information.
For a determination, correction, appeal, or life-changing-event request, contact Social Security. For help understanding how Part D plan costs fit into the rest of your coverage, review the plan separately.
We use official Medicare information and established consumer-assistance resources. Plan details and rules can change, so check the linked source for the latest information.
Medicare.gov · Link checked
State Health Insurance Assistance Programs · Link checked
Medicare.gov · Link checked
Social Security Administration · Link checked
Medicare.gov · Link checked
Medicare.gov · Link checked
Related links
More Medicare topics that can help you understand the bigger picture.
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Keep premium questions separate from enrollment timing questions.
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Compare coverage and plan costs without confusing them with an IRMAA determination.
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Talk through plan costs while using Social Security for the IRMAA determination.
Related links
Next steps when you are ready to talk with a licensed agent or compare your options.
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Review the broader premium, deductible, and cost-sharing picture.
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Understand the plan premium and prescription coverage that remain separate from Part D IRMAA.
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Review where Part B fits within Medicare.
FAQ
Plain-English answers to questions people often ask about Medicare. Plan benefits, costs, and availability vary, so use these as a starting point and check the details that apply where you live.
No. Social Security determines whether IRMAA applies.
Yes. A Social Security notice may address an income-related adjustment for Part B, Part D, or both.
A qualifying life-changing event that reduces household income may support a request. Follow Social Security's current instructions and evidence requirements.
Important Medicare information
Important Medicare disclosure
Medicare Saving Solutions is not connected with or endorsed by the U.S. government or the federal Medicare program, and Medicare has not reviewed or endorsed this information.
We do not offer every plan available in every area. Plan availability varies by ZIP code and county. To review all available options, visit Medicare.gov, call 1-800-MEDICARE, or contact your State Health Insurance Assistance Program (SHIP).
The right Medicare plan depends on your ZIP code, doctors, prescriptions, budget, and health needs.
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