A retiree sells a numbers-matching 1967 Ford Mustang for $85,000, calculates the capital-gains tax, and considers the deal finished. Eighteen months later, a letter from Social Security arrives. His Medicare Part B premium is rising by hundreds of dollars a month.
He priced the tax into the sale. Nobody told him about the second bill.
The Income-Related Monthly Adjustment Amount (IRMAA) affects only a minority of Medicare beneficiaries. If baseline income plus the gain remains below the first threshold, no surcharge applies. The exposure begins when modified adjusted gross income (MAGI) already sits within striking distance of a bracket and the retiree sells a classic car, coin collection, artwork, or another asset that has appreciated far beyond its basis. A tax event quietly becomes a Medicare event two years later.
The 28% Rate Is Only Half the Bill
The IRS taxes long-term gains on collectibles at a maximum rate of 28%, compared with the usual 15% or 20% long-term rates that may apply to stocks. Collectibles include art, antiques, rugs, coins, stamps, precious metals, gems, and certain other tangible property. A qualifying classic car held as an antique or collectible may fall into that category.
The tax applies to the gain, not the sale price. On an $85,000 Mustang with a very low basis, the federal collectibles tax could still run north of $20,000. Restoration costs and selling expenses may increase the basis or reduce the taxable gain, making old receipts unexpectedly valuable.
Medicare uses the same gain differently. IRMAA is calculated from modified adjusted gross income, which for this purpose generally means adjusted gross income plus tax-exempt interest. A taxable capital gain flows through Form 1040 and into that calculation. Medicare does not care whether the gain came from NVIDIA shares or a Mustang parked under a cover for 30 years.
Two Years Later, the Premium Arrives
Medicare generally uses a two-year lookback. A 2026 premium is based on the 2024 tax return. Sell the Mustang in 2024, and the surcharge appears in 2026. Sell it in 2026, and the gain will generally affect Medicare premiums in 2028.
Take a single filer with baseline MAGI of $100,000 from taxable Social Security, a pension, and required distributions. That sits below the first 2026 IRMAA threshold, so the retiree pays the standard $202.90 Part B premium and no Part D surcharge.
Add an $85,000 taxable gain, and MAGI reaches $185,000. Using the 2026 brackets for illustration, that lands in the $171,000-to-$205,000 tier. Part B rises to $527.50 per month, while Part D adds a $60.40 monthly surcharge. The bill for that year:
| Cost (single filer) | Without Sale | With $85K Gain |
|---|---|---|
| Part B total premium | $202.90 | $527.50 |
| Part D IRMAA surcharge | $0.00 | $60.40 |
| Added annual cost | $0 | $4,620 |
For a married couple with both spouses on Medicare, the same tier costs an additional $9,240 annually. Their combined Part B premiums and Part D surcharges total about $14,110 for the year before the ordinary Part D plan premiums, but only $9,240 of that represents the income-related increase.
The brackets used for 2028 have not yet been published. Anyone planning a sale now can use the current table as a guide, but should leave room below the cliff instead of treating today’s threshold as a promise.
SSA-44 Will Not Erase the Sale
The most common assumption at this point is wrong. Form SSA-44 lets Social Security recalculate IRMAA when income falls because of a qualifying life-changing event, including marriage, divorce, death of a spouse, work stoppage, work reduction, or loss of pension income.
A voluntary asset sale is not on the list. Social Security specifically treats many one-time income spikes as nonqualifying events. You cannot use SSA-44 to erase the Mustang gain simply because it will not repeat.
The surcharge usually lasts only for the premium year tied to that tax return because IRMAA is recalculated annually. But the retiree still owes it for that year.
Widows and widowers face another wrinkle. Filing single brings much lower IRMAA thresholds. The death of a spouse may support an SSA-44 request when household income falls, but it does not make a voluntary collectible gain disappear from the revised calculation.
What to Do Before You Sign the Bill of Sale
Three steps can keep the second bill from becoming a complete surprise:
Run the sale-year MAGI. Add the expected taxable gain to projected income for the calendar year the sale closes. Use the latest IRMAA table as an estimate and build in a cushion because the table governing premiums two years later may differ.
Explore an installment sale. If the buyer makes at least one payment after the year of sale, the installment method may allow part of the gain to be recognized in later years. That can keep MAGI below a bracket in each year, but it also means financing the buyer and accepting collection risk. Have a tax professional structure the agreement before transferring the car.
Do not count on SSA-44. Reserve the form for qualifying life-changing events. With a voluntary sale, the useful planning happens before the transaction and before the gain reaches the tax return.
The Mustang may be worth every dollar. Just remember that the buyer’s check can arrive with a second passenger: a Medicare surcharge waiting two years down the road.
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