If you sold a stock, a rental property, or even some crypto last year and made money, the IRS has a question for you: how much of that profit is it entitled to?
The answer depends on a number that most Americans ignore until tax season — how long you held the asset.
Sell something you owned for a year or less, and your profit is taxed as ordinary income.
That means it stacks on top of your salary and can push you into the 22%, 24%, or even 37% bracket.
Sell the same asset after holding it for more than a year, and the long-term capital gains rates kick in — 0%, 15%, or 20%, depending on your taxable income.
For 2025, the 0% long-term rate covers single filers with taxable income up to roughly $48,350 and married couples filing jointly up to about $96,700.
That's not free money for everyone, though.
It only applies to the gain itself, and the income thresholds are based on your total taxable income, not just the profit from the sale.
A couple earning $90,000 who sells a rental property with a $50,000 gain doesn't get the whole gain taxed at 0%.
Part of that gain can spill over into the 15% bracket once their total income crosses the threshold.
It's a stacked calculation, and it catches plenty of filers off guard.
There's another wrinkle that hits property owners hard: depreciation recapture.
If you rented out a home and claimed depreciation deductions over the years, the IRS taxes that portion at up to 25% when you sell — even if your overall gain would otherwise qualify for a lower rate.
Landlords who assumed they'd pay 15% often owe thousands more.
For higher earners, an extra 3.8% net investment income tax applies once modified adjusted gross income tops $200,000 for singles or $250,000 for couples.
That surtax sits on top of the capital gains rate, so the real top rate on investment profit can reach 23.8%.
The simplest move is to hold investments longer than 12 months whenever possible.
Selling at month 11 instead of month 13 can cost you a double-digit percentage of your gain in extra tax.
If you're sitting on a winner you've owned for years, that patience has already paid off.
Tax-loss harvesting is the other tool worth knowing.
If you have a losing investment, selling it can offset gains dollar for dollar, plus up to $3,000 of ordinary income per year.
Just watch the wash-sale rule — buy the same security back within 30 days and the loss doesn't count.
Retirement accounts remain the cleanest shelter.
Gains inside a 401(k) or IRA aren't taxed in the year they happen, which is why maxing out those accounts does more for most households than any clever trading strategy.
Nine states have no income tax at all, but others — California, for example — tax capital gains as ordinary income, with rates topping 13%.
A gain that costs 15% federally could cost nearly 28% combined depending on where you live.
Our take: the capital gains rules aren't complicated so much as unforgiving of shortcuts.
The gap between short-term and long-term treatment is one of the few places where simply waiting can save you real money.
Final Thoughts
Before you sell anything this year, run the numbers — or pay someone to run them for you.