Sell a stock, a rental property, or even a piece of land you've held for years, and Washington wants a cut of the profit.
That cut is the capital gains tax, and how much you owe depends less on how much you made than on how long you held the asset.
Hold an investment for more than 12 months and the profit is generally taxed at long-term rates of 0%, 15%, or 20%, depending on your taxable income.
Sell sooner than that and the gain is treated as ordinary income, taxed at your regular bracket rate, which can run as high as 37%.
For 2024, the 0% long-term rate applies to single filers with taxable income up to $47,025 and married couples filing jointly up to $94,050.
The 15% rate stretches to $518,900 for singles and $583,750 for couples.
Above those thresholds, the top 20% rate kicks in.
High earners can also owe the 3.8% net investment income tax on top of the base rate, which means the real top rate on long-term gains can reach 23.8% for some filers.
Short-term trading carries the bigger sting because every gain stacks on top of your wages.
A profitable flip in a taxable brokerage account can push you into a higher bracket and raise the tax bill on money you'd already earned elsewhere.
Selling your primary home is often tax-free on the first $250,000 of profit for singles and $500,000 for couples, if you've lived there two of the last five years.
Retirement accounts like 401(k)s and IRAs don't trigger capital gains at all, since they're already tax-advantaged.
And if an investment loses money, those losses can offset gains and up to $3,000 of ordinary income each year, with the rest carried forward.
If you're near a bracket threshold, spreading a sale across two tax years might keep more of the gain in the 0% or 15% range.
Tax-loss harvesting, where you sell a loser to offset a winner, is another lever investors use before year-end.
Nine states have no income tax at all, while others tax capital gains as ordinary income.
California, for instance, can push the combined rate well past 30% for its top earners.
Tax brackets and thresholds shift with inflation, and proposals to change capital gains rules surface in Washington regularly.
The working assumption for most households should be that the rules you plan around today may not be the rules that apply when you sell.
My take: the capital gains rate gets less attention than it deserves because most people assume it only matters for the wealthy.
In reality, a single well-timed stock sale can move a middle-income household into a different tax treatment overnight.
Final Thoughts
Knowing your bracket before you sell, not after, is one of the cheapest pieces of financial planning available.