Picture a 70-year-old retiree, comfortably drawing Social Security and pulling modest withdrawals from an IRA, who gets a call from a former colleague. The offer is a six-month consulting project paying $20,000. Nice money for interesting work, and it feels like discovered income. What almost no one mentions until the paperwork lands: that gig can quietly push next-cycle Medicare premiums up by $1,148 for the year.
This scenario shows up on retirement forums frequently. Someone takes a small 1099 project, files taxes as usual, and 24 months later opens a letter from Social Security explaining that their Part B premium just jumped. They did nothing wrong. They simply crossed an invisible line called the Income-Related Monthly Adjustment Amount, or IRMAA, which adds a surcharge to Medicare premiums when income rises above certain thresholds.
Why a Small Gig Trips a Big Surcharge
IRMAA works as a cliff. For a single filer in 2026, if modified adjusted gross income (MAGI) lands at or below $109,000, the Part B premium is the standard $202.90 a month and there is no Part D surcharge. Cross a dollar over that line, up to $137,000, and Part B jumps by $81.20 a month while Part D adds another $14.50 monthly surcharge on top of the plan premium.
The Part B surcharge alone comes to about $974 a year. Add the Part D piece and you get roughly $1,148 in extra Medicare costs, entirely because income tipped one dollar past the threshold. That is the figure retirees keep bumping into.
Now picture the setup. A single 70-year-old collecting around $36,000 in Social Security, taking $60,000 from an IRA to cover living expenses, and earning a bit of interest and dividends might sit at roughly $95,000 in MAGI. Comfortable, and well under the line. Add a $20,000 consulting check reported on a 1099, and suddenly modified adjusted gross income is closer to $115,000. The gig itself created a Medicare problem rather than a tax one.
One more variable worth knowing: IRMAA works on a two-year lookback. Income earned in 2026 determines premiums in 2028. So the surcharge does not arrive with the paycheck. It shows up silently, long after the money has been depleted.
How the Pieces Interact in Retirement
The reason this trap catches so many people at 70 is that other income streams are already stacked up. Social Security is flowing, boosted by the 2.8% cost-of-living adjustment (COLA) for 2026. Required minimum distributions (RMDs) from traditional IRAs kick in at age 73, but many retirees are already withdrawing before then. Pensions, annuities, dividends, and capital gains all count toward modified adjusted gross income (MAGI).
Consulting income sits on top of that stack. It is not taxed differently in a punitive way, but because it is added at the margin, every dollar of it counts against the IRMAA threshold. A retiree who has carefully managed withdrawals to stay under $109,000 can undo that planning with a single project.
There are levers. Contributing part of the consulting income to a solo 401(k) or SEP-IRA lowers MAGI. Bunching charitable giving through qualified charitable distributions from an IRA reduces taxable withdrawals directly. Timing matters too. Splitting a project across two tax years can keep each year below the threshold.
What to Weigh Before Saying Yes
Two factors are worth sitting with before accepting the gig. First, run a rough estimate of where the year’s MAGI will land with the extra income included. If it crosses $109,000 as a single filer or $218,000 jointly, the surcharge is coming, and the net take-home on that consulting check is smaller than it looks. Second, remember the surcharge only lasts one year unless income stays elevated. A single project is a one-time hit. A recurring engagement becomes a recurring cost.
The gig is often still worth taking. The point is knowing the true price before the letter arrives, so the decision feels intentional rather than accidental. Everyone’s income mix and filing status shift the math a little, and a quick check with a tax preparer before signing the contract is usually money well spent.
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