Tax Planning / The Compound Effect
The IRMAA Cliff: Why One Extra Dollar Can Cost You $2,000
| 5 min | By Heath J. Harris
IRMAA is not a phase-in. It is a cliff. Cross an income threshold by a single dollar and your Medicare premium jumps to the next tier for a full year, for both spouses. Here is how the brackets work, and the three tools we use with clients to stay under the line.
Tax brackets phase in. You cross a bracket, only the dollars above the line pay the new rate. That is not how IRMAA works.
IRMAA is a cliff. Cross a bracket by a single dollar and the entire next tier of premium kicks in. For the whole year. For both spouses on Medicare. One dollar of extra income can cost a married couple thousands of dollars of Medicare premium, two years later.
This is the mechanic that surprises people. It should not be allowed to surprise you.
What the brackets actually look like
IRMAA uses six brackets for both Part B and Part D. The bottom bracket is the standard premium. Each bracket up adds a surcharge on top. The surcharges are not trivial, and they compound across both Part B and Part D.
The exact dollar thresholds are indexed each year. What matters is the shape. The jumps between brackets are measured in tens of thousands of dollars of income. The step-ups in premium are measured in hundreds of dollars a month. Both of those numbers are per person. So for a couple, every line matters twice.
Where the cliff actually bites
The three most common ways clients accidentally cross a line:
A Roth conversion that runs one dollar over. You model a conversion to the top of a bracket. A late-year 1099 arrives for interest you forgot about. You are now a thousand dollars over. Premium jumps to the next tier. Both spouses. Full year.
An end-of-year bonus that arrives on December 30. A capital gain distribution that lands in a mutual fund in mid-December. A one-time consulting payment. Any of them can push you across by an amount that looks small on paper and costs real money at the premium level.
A one-time event. The sale of a business. A large real estate transaction. An inheritance that includes an IRA. The dollars are big enough that the IRMAA cost is often rounding error. Knowing it is there changes how you time the transaction.
Three tools we use with clients to stay under the line
One: build the projection before the year closes. By mid-November, most of the year is knowable. Wages, dividends, interest, capital gains to date, projected Required Minimum Distributions. Lay them all on one sheet. Compare the total to the bracket line above and below you. That number, the cushion, is what tells you whether you have room to do a conversion, harvest a gain, or accept a late bonus without crossing.
Two: use Qualified Charitable Distributions if you are over 70 and a half. A QCD moves money directly from an IRA to a charity. It satisfies the RMD and it does not count toward MAGI. For charitably inclined clients, it is one of the cleanest ways to shave MAGI without changing what you actually give.
Three: split transactions across years when you can. A large conversion is often cheaper run over two years than one. So is realizing a large capital gain. So is recognizing deferred compensation. The IRS does not care. IRMAA does.
What to do if you have already crossed
Two paths.
First, check whether you had a qualifying life event. Retirement, divorce, death of a spouse, loss of income-producing property. If you did, Form SSA-44 lets you request a reconsideration. You are not asking for forgiveness. You are telling Social Security that the two-year-old income no longer represents your situation.
Second, plan forward. You cannot amend your way out of a premium that is already set. You can adjust this year so next year is not another cliff.
The bigger point
IRMAA is one of the clearest examples of why coordinating tax planning, retirement income, and Medicare in one conversation matters. A return preparer sees the return. A Medicare advisor sees the premium. Very few people see the line that connects them.
That line is two years long, and it moves in one direction.
If you want to know where you stand relative to this year's IRMAA brackets and what your options are, we invite you to schedule a complimentary Retirement Clarity Assessment. As a fee-only fiduciary, Compound Advisory coordinates the full picture.
Compound Advisory is a registered investment advisor. This content is for educational purposes and is not individualized tax or legal advice. IRMAA brackets are adjusted annually. All investing involves risk, including the possible loss of principal.