The slot machine flashed, the bells rang, and a couple in their late sixties walked out of the casino with a roughly $250,000 jackpot. They paid the federal withholding, set aside more for state taxes, and put the rest to work: a new roof, a long-delayed trip, a chunk into the brokerage account. Two years later, both of their Medicare premiums went up, and the connection was not obvious until they sat down with the numbers.
A version of this scenario is not uncommon on retirement forums. Someone hits a big number at the casino, sells a rental, or cashes out company stock, and then two years later opens a Social Security statement showing a smaller deposit. The money is real. The surprise is real. And the rule behind it is not a glitch.
Why a Good Night in 2024 Shows Up on a 2026 Medicare Bill
The mechanism at work here is the Income-Related Monthly Adjustment Amount, or IRMAA, a surcharge added to Medicare Part B and Part D premiums for higher-income beneficiaries. The piece most people miss is the timing. On her Women & Money podcast, Suze Orman explained, “IRMAA is based on your modified adjusted gross income (MAGI) from two years prior. So they’re always looking back two years.” A jackpot works the same way as a one-time property sale.
Gambling winnings are fully taxable ordinary income. The casino issues a W-2G on larger wins, and the full amount flows into adjusted gross income (AGI), which feeds modified adjusted gross income (MAGI). Gambling losses can only be deducted as an itemized deduction, and only up to the amount of winnings. They might lower the income tax bill, but the gross winnings still inflate MAGI. For IRMAA, MAGI is what counts.
So 2026 Medicare premiums are set off the 2024 tax return. A $250,000 jackpot on its own is enough to push a married couple past the $218,000 joint MAGI threshold where IRMAA kicks in, even with no other income at all.
The Part That Hits Both Spouses
IRMAA works as a cliff. Cross the line by a dollar and the surcharge applies for the full year. It is assessed per person. Both spouses on Medicare pay it, deducted right out of each Social Security check.
For 2026, the standard Part B premium is $202.90 a month. A joint MAGI between $218,000 and $274,000 bumps each spouse’s total Part B premium to $284.10 a month, with a separate Part D surcharge of $14.50 layered on top. Two people, 12 months, two surcharges each. That is the “free money isn’t free” moment.
How It Fits With Everything Else
The good news is that a one-time windfall raises IRMAA for a single year. When 2025 income normalizes, the 2027 premiums reset. The bad news is that the Social Security Administration’s (SSA’s) life-changing-event appeal, filed on Form SSA-44, covers things like retirement, divorce, or the death of a spouse. A jackpot does not qualify.
The interaction worth thinking about is the rest of that 2024 return. In a windfall year, every extra dollar of income stacks on top of the jackpot and can push MAGI into a higher IRMAA tier: a Roth conversion, a capital gain harvested for “free,” a larger-than-needed IRA withdrawal. The year you win is the year to take less of everything else you control. The 2.8% Social Security COLA for 2026 can be partly or fully eaten by an IRMAA surcharge in the same year.
What to Carry Forward
Two things are worth holding onto from a situation like this. First, any large one-time income event in your sixties or seventies has a delayed Medicare echo, and the two-year lag is the part that fools people. If you know a big number is coming, look at the IRMAA brackets before December 31, not in April. Second, keep careful gambling-loss records. They will not lower MAGI, but they can meaningfully reduce the income tax bill on the winnings.
Every situation has its own variables, and the brackets shift each year. A conversation with a tax preparer in the fall of a windfall year tends to be worth far more than it costs.
Top Gaining Stocks
Top Losing Stocks