How are short-term capital gains taxed?
Last updated August 2026
Short answer
Short-term gains carry no tax advantage at all. That single fact quietly makes the holding period one of the most valuable variables an ordinary investor controls, and one of the least considered.
There is no short-term rate
Long-term gains have their own brackets. Short-term gains do not. They are added to your ordinary income and taxed at whatever marginal rate that lands in.
For someone in the 24% federal bracket, a $10,000 short-term gain costs $2,400. The same gain held past the one-year mark would be long-term and, at 15%, cost $1,500. The $900 difference is the entire return on waiting a few extra days.
State tax usually applies on top, and most states make no distinction between short and long term, so the state charge is the same either way.
The holding period is exact and unforgiving
The clock starts the day after you acquire the investment and ends on the day you sell it. More than one year is long-term. Exactly one year is not.
Buy on 10 March and sell on 10 March the following year and you have a short-term gain. Sell on 11 March and it is long-term. That one day can be worth twenty percentage points.
Trade date governs, not settlement date, which is the detail that catches people selling in the last days of December.
Where short-term gains come from without you noticing
Rebalancing. Trimming a position that has run up in the last few months is a short-term sale, and doing it in a taxable account converts a routine maintenance task into a tax event.
Reinvested dividends. Each reinvestment buys a new lot with its own clock. A position you have owned for a decade contains shares bought last quarter, and selling under FIFO does not always reach them, but selling under other methods can.
Shares from vesting or exercise, which usually start their clock at vesting or exercise rather than at grant.
Losses offset gains, and the ordering favours you
Realised losses offset realised gains. Short-term losses are applied against short-term gains first, and long-term against long-term, before any remainder crosses over.
Because short-term gains are taxed at the higher rate, a short-term loss offsetting a short-term gain is worth more than the same loss offsetting a long-term one. That ordering is automatic and works in your favour.
If losses exceed gains, up to $3,000 a year can be deducted against ordinary income and anything left carries forward indefinitely.
When short-term is the right answer anyway
Tax is a cost, not the decision. Holding a position you no longer believe in for four more months to save $900 is a bet that it will not fall more than $900 in that time, and that is a real risk, not a free option.
A thesis that has broken, a position that has become dangerously large, or cash you genuinely need are all sound reasons to sell short-term and accept the bill.
The useful framing is that the tax difference is a known number and the price movement is not. Weigh them explicitly rather than defaulting either way.
Try it in Walnut
Walnut reads the positions in your connected brokerage, so before selling you can see what you hold and how long you have held it.
The one place it does not matter
Inside a 401(k), IRA or HSA there is no capital gains tax and no holding period. You can trade freely without creating a taxable event of any kind.
This is why frequent rebalancing, and any strategy involving regular selling, belongs in a tax-advantaged account where possible. The same activity that is expensive in a brokerage account is free in an IRA.
It is also why the tax tail should not wag the dog in retirement accounts: there is nothing to optimise.
The 3.8% surcharge applies here too
Above $200,000 of modified adjusted gross income for single filers and $250,000 for married couples filing jointly, an extra 3.8% net investment income tax applies to capital gains, dividends and interest.
Stacked on a 37% marginal rate, a short-term gain can face a combined federal rate approaching 41% before state tax.
That is the widest the gap between short and long term ever gets, and it is the case where the holding period is worth the most attention.
Sources
Capital gains rates and holding periods are in IRS Topic 409. Dividend classification, holding periods, the wash sale rule and 1099 reporting are in IRS Publication 550. Walnut is informational and is not an investment adviser. This guide is educational and not personalized tax or investment advice; anything with a tax consequence is worth confirming with a tax professional.
FAQ
How are short-term capital gains taxed?
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As ordinary income at your marginal rate. There is no preferential short-term rate and no separate bracket schedule: the gain is added to your other income. For most people that means 22% to 37% federally, plus state tax and possibly the 3.8% net investment income surcharge.
How long must I hold to avoid short-term treatment?
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More than one year, measured from the day after you acquired the investment to the day you sell. Exactly one year is still short-term. Trade date governs, not settlement date, which matters if you are selling near a year end.
How much does short-term treatment actually cost?
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On a $10,000 gain, someone in the 24% bracket pays $2,400 short-term against $1,500 at the 15% long-term rate, so $900. At the top bracket with the 3.8% surcharge the gap is wider still, approaching twenty percentage points.
Do short-term gains matter inside an IRA?
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No. There is no capital gains tax inside a 401(k), IRA or HSA and no holding period to track, so you can trade without creating a taxable event. That is why strategies involving frequent selling are far cheaper in a tax-advantaged account.