IRMAA (Income-Related Monthly Adjustment Amount) increases Medicare Part B and D premiums for beneficiaries with higher incomes. It is based on tax returns from two years earlier. If your income is above certain thresholds, you will pay more. Both Original Medicare and Medicare Advantage participants are subject to this surcharge. We outline the 2025, 2024, and 2026 IRMAA brackets. https://www.federalpensionadvisors.com/post/2025-irmaa-brackets