Medicare enrollment for 2026 opens on October 15. Do you know what you earned two years ago? Your 2024 income will determine if you’ll pay the Medicare surcharge, or income-related monthly adjustment amount (IRMAA), next year. If taxable income exceeds certain thresholds, Medicare and Medicare Advantage beneficiaries must pay IRMAA plus standard premiums. IRMAA also applies to any prescription drug coverage. Medicare premiums are expected to rise by a near record dollar amount next year and eat a chunk o ...