Medicare
Many people are surprised to learn that Medicare does not cost the same for everyone. Higher-income retirees pay more through a surcharge called IRMAA.
What IRMAA actually is
IRMAA stands for the income-related monthly adjustment amount. It is an extra charge added on top of your standard Medicare Part B and Part D premiums once your income crosses certain thresholds.
The surcharge rises in tiers, so the more income you report, the larger the addition to your monthly premium. For higher-income households it can add thousands of dollars a year across a couple.
The two-year lookback and the cliff effect
IRMAA is based on your modified adjusted gross income from two years earlier. That delay catches many people off guard: a one-time spike today — a large Roth conversion, the sale of a home, or an unusually big required distribution — can raise your premiums two years down the road.
Just as important, the thresholds are cliffs, not gentle ramps. Going a single dollar over a tier can increase your premium for the entire year, which makes staying just under a threshold genuinely valuable.
How to plan around it
Because IRMAA keys off income, it is manageable with foresight. Spreading Roth conversions across several years, timing capital gains, and coordinating withdrawals can keep your income below the next tier.
If a major life event — retirement, the loss of a spouse, or reduced work — has lowered your income, you can also file an appeal to have a more recent year considered. A quick estimate before year-end is often all it takes to avoid an unwelcome surprise.
Key takeaways
- IRMAA is an income-based surcharge on Medicare Part B and Part D.
- It uses your income from two years earlier, and the thresholds are hard cliffs.
- Managing income and timing conversions can keep you under the next tier.
