IRMAA Explained: The Medicare Surcharge Cliffs That Turn $1 of Income into $1,000 of Premiums
One dollar of income in the wrong year can raise your Medicare premiums by more than $1,000 annually. The dollar that does it was earned two years before the bill arrives, which is why people discover it long after the year that caused it closed.
The Two-Year Lookback Is the Trap
IRMAA stands for Income-Related Monthly Adjustment Amount, the Social Security Administration's mechanism for charging higher-income enrollees more for Part B and Part D. In 2026, the standard Part B premium is $185.00 per month. At the top bracket it climbs to $628.90 per month, per person, roughly $10,600 a year for a couple above the base premium.
The lookback is what catches people. Medicare uses your MAGI from two years prior to set your current-year bracket. Enroll in 2026, and SSA is reading your 2024 return. A Roth conversion, business sale, or year-end gain harvest from 2024 is setting your premium today, and nothing this year changes it.
The 2026 Brackets and What Trips Them
For 2026, the IRMAA thresholds (based on 2024 MAGI) are approximately $106,000, $133,000, $167,000, $200,000, and $500,000 for single filers. Married filing jointly thresholds are roughly double. Crossing from just below $106,000 to just above it as a single filer adds approximately $70 per month to Part B alone.
Events that most reliably push retirees across a cliff:
- Roth conversions, where the MAGI impact is dollar for dollar
- Required minimum distributions, which begin at age 73 and can be substantial by age 75 or 76
- A business or asset sale generating a large capital gain
- Qualified dividends and taxable interest accumulating silently in taxable accounts
The insight is not to avoid income but to know where you stand relative to each cliff before you realize any. A conversion that stops $5,000 below a bracket line is a meaningfully different decision from one that crosses it. This is Soil-layer work in the Sporos Doctrine.
The SSA-44 Appeal Most People Never Hear About
If your lookback-year income was elevated by a one-time event and has since dropped, you are not helpless. Form SSA-44 lets you appeal the determination using a more recent year, provided you had a qualifying life-changing event: retirement, divorce, death of a spouse, or loss of income-producing property. A business sale alone does not qualify. Retiring from that business in the same year may.
The Takeaway
The fact that decides your answer is not how much income you have. It is how close your MAGI sits to the next threshold in the year you create it, because IRMAA is a cliff, not a slope. Ten dollars over the line costs the same as ten thousand.
The people who get hurt here are usually doing careful work. They size a Roth conversion correctly against their tax bracket, hit the number exactly, and learn two years later that it cleared an IRMAA threshold appearing nowhere in the tax tables.
If you have a conversion, an RMD, or a sale on the horizon and your MAGI is within $10,000 of any cliff, that proximity is worth a conversation before you act.
The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Consult with qualified professionals for guidance specific to your situation.
The information provided is for educational and informational purposes only and does not constitute investment advice. Past performance is not indicative of future results. All investing involves risk, including the potential loss of principal. Consult with a qualified financial professional before making any financial decisions. Securities and advisory services offered through LPL Financial, a Registered Investment Advisor. Member FINRA & SIPC.
Have questions about your financial plan?
Book a free discovery call with our team. We'll listen to your goals and show you how life-centered planning works.
Prefer to text? Reach us at (949) 259-5240 and we'll reply when you're free.