For Medicare brokers & retirement-income advisors
Every fall, a client opens a letter saying their Medicare premium went up, and calls their agent. The agent did not cause it and cannot undo it — because the decision was made by a tax return filed two years earlier.
The income-related monthly adjustment amount is a surcharge on Medicare Part B and Medicare prescription drug coverage for higher-income beneficiaries. Most beneficiaries pay roughly 25% of the Part B cost, with the government covering about 75%. Higher-income beneficiaries instead pay 35%, 50%, 65%, 80% or 85% of the total cost — five tiers, decided by income.
Both thresholds are set on modified adjusted gross income — MAGI — and for IRMAA that term means something specific.
| Filing status | MAGI above… | Result |
|---|---|---|
| Married filing jointly | $218,000 | Higher Part B and drug coverage premiums |
| Any other filing status | $109,000 | Higher Part B and drug coverage premiums |
The Social Security Administration defines it as total adjusted gross income plus tax-exempt interest income. Municipal bond interest that escapes income tax still counts toward this threshold.
Tier boundaries are bright lines. There is no gradual phase-in between them, so a beneficiary one dollar over a threshold pays that tier's full surcharge for the entire year. A modest, avoidable amount of extra income in the wrong December can cost twelve months of higher premiums for two people.
The part that makes it feel unfair: the surcharge is set by the most recent federal tax return the IRS provides to SSA — in practice, the return from two years earlier. A Roth conversion, a property sale, an inherited IRA distribution or one heavy withdrawal year lands in Medicare premiums two years later, long after the decision is out of reach.
Up to 85% of Social Security benefits are taxable, and taxable benefits sit inside adjusted gross income — so they count toward the MAGI that sets IRMAA. When a client claims changes two things at once: how much benefit income they report, and how much they need to withdraw from other sources alongside it.
A client who delays claiming often draws more heavily on an IRA in the meantime, which raises MAGI in those years. A client who claims earlier may draw less. Neither is automatically right. The point is that claiming timing is one of the inputs, and it is the input most often decided without anyone looking at this at all.
The two-year lookback means the planning has to happen well before the letter arrives.
When income has gone down because of a qualifying life-changing event — work stoppage or work reduction being the common ones at retirement — a beneficiary can ask SSA to use more recent income instead of the two-year-old return. The vehicle is Form SSA-44, the Medicare Income-Related Monthly Adjustment Amount Life-Changing Event form.
Flag it, then hand it off. Eligibility depends on the specific event and the documentation, and the form sits squarely in tax territory. The right move is to spot it and send the client to their accountant or tax professional to file it. The client gets someone licensed handling it, and everyone stays inside their lane.
Worth being precise, because this is where tools overpromise.
A claiming analysis built on an earnings record does not hold a client's full MAGI. It does not know their pension, their required minimum distributions, their capital gains, their rental income or their filing status. It therefore cannot place a client in an IRMAA tier, and any tool that claims to do so from an earnings record alone is telling you something it cannot know.
What it can do is surface the exposure: how much of the recommended benefit counts toward the threshold, where the tier lines sit, that the lookback is two years, and that SSA-44 exists. That is the coordination point — the thing you take to the client's CPA before the December decisions get made rather than after.
Your enrollment commission is capped. The claiming conversation is not. MySSAgent turns a client’s own earnings record into the optimal claiming age with the dollars attached, and flags the Medicare premium exposure that decision feeds into — in about a minute, for every client in the claiming window rather than the one who thought to ask. No Social Security number is ever entered.
See how it works for brokers →Sources
This article is educational and is not tax, legal, insurance or compliance advice. IRMAA determinations, SSA-44 eligibility and tier placement depend on individual circumstances and should be reviewed with a qualified tax professional.
