A Dinosaur Skeleton Just Sold for $47.3 Million. Why a Retiree’s Windfall Might Not Cut Social Security
Selling a painting, a classic car, or a coin collection while collecting Social Security sounds like a recipe for losing benefits, but the rules work in ways most retirees never expect and the real costs hide somewhere else entirely.
A Nanotyrannus skeleton called Jodi sold at a Sotheby’s auction in New York for $47.3 million. Few retirees keep a dinosaur in the garage. Plenty of retirees, though, own valuable things. These may have quietly gained value for decades, like a coin collection, an inherited painting, a classic car or a box of old baseball cards.
If you sell one of those while already receiving Social Security, it’s fair to wonder whether a big check from the sale will reduce your monthly benefit. In most cases, the answer is no. Knowing why can keep you from putting off a sale for no reason, and it can also help you plan for the costs that do come with a large gain.
Social Security’s Earnings Limit Targets Paychecks From Work
The rule retirees worry about is the retirement earnings test. If you claim before full retirement age (FRA) and earn more than $24,480 in 2026, Social Security withholds $1 for every $2 above that limit. In the year you reach FRA, the limit rises to $65,160 and the withholding drops to $1 for every $3. From the month you reach the full age for benefits, there is no limit.
The test counts wages and net earnings from self-employment. An example from the agency shows what that means in dollars. A retiree entitled to $800 a month who earns $33,400 at a job loses $4,460 of benefits for the year.
Money from selling a personal possession doesn’t enter that calculation. Federal law excludes gains from selling personal capital assets when determining self-employment earnings. A 63-year-old who sells a painting she’s owned for decades won’t lose retirement benefits because of that sale, whether it brings in thousands or millions.
Turning a Hobby Into a Business Changes the Answer
That exclusion has a boundary. It doesn’t cover inventory or property held primarily for sale to customers in the ordinary course of a business. A fossil dealer who regularly buys specimens to resell, or a retiree running a vintage-guitar resale business, may have net earnings from self-employment that count toward Social Security’s earnings limit.
For a dealer, the consequences can be different. Net business earnings may count toward the retirement earnings limit and generally are subject to self-employment tax. Regularly buying items for resale, advertising and selling to customers point toward a business. Selling something you’ve owned and enjoyed for decades generally looks more like disposing of a personal asset.
Taxes and Medicare Premiums Are Where a Windfall Bites
Your Social Security checks may keep coming, but the sale is still taxed. Gain on an asset held more than one year counts as long-term capital gain. Gain on a collectible can be taxed at up to 28%.
The gain also counts in the formula that determines whether your benefits are taxed. Once half your benefits plus your other income goes over $25,000 for single filers or $32,000 for joint filers, part of your benefits becomes taxable, up to a cap of 85%. A six-figure sale drives most retirees straight to that cap for the year.
Medicare premiums can rise too. The standard Part B premium is $202.90 a month in 2026. At the highest income tier, single filers with income of $500,000 or more pay $689.90, as do married couples filing jointly with income of $750,000 or more.
On top of that, those top earners pay an extra $91 a month for Part D drug coverage. Medicare generally uses a tax return from two years earlier, so a large gain in 2026 could raise premiums in 2028. If income returns to its previous level the following year, the surcharge would generally fall again in 2029. (This IRMAA lookback is one of several quiet rules that drain money from retirement accounts, and we charted the rest in a free tax trap map.)
None of this reduces the benefit itself. Your monthly amount still gets inflation increases, including the 3.6% raise set for 2027.
Identify the Asset Before You Assume Your Checks Are at Risk
Start by determining whether you’re selling as a collector or as a dealer, because that one question settles whether the earnings test applies at all. If you’ve been buying and reselling regularly, talk with a tax preparer before the sale is completed, while you can still change how and when it happens.
Then think about timing. A sale lands in one tax year, and the income stacks on top of everything else you report that year. Selling in a year without large retirement account withdrawals keeps the increase smaller. For anyone whose activity starts to look like a business, waiting until FRA takes the earnings test off the table.
A one-time sale of something you’ve owned for years usually leaves your Social Security check alone. Several things can change the result. How long you held it, how you got it and what else is on your tax return that year all play a role, so run your own numbers before you list it.
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