How Are Short-Term Trades Taxed vs Long-Term Ones?

Say you made 4,000 dollars on a trade. Sold after 11 months, at a hypothetical 24% ordinary income rate, the tax on it is 960 dollars; sold after 13 months, at a hypothetical 15% long-term rate, it is 600. The date of the sale did that. Under IRS rules, a net gain on shares you kept for a year or less counts as short term and meets ordinary income rates, while a net gain on shares kept more than one year is long term and taxed at the lower capital gains rates of 0%, 15% or 20%, depending on your taxable income.

Where the line falls

Long term means held more than one year. A holding of exactly one year is still short term.

Counting begins on the day following the purchase trade date, and the sale date is included. Buy on March 3 of one year and the clock starts on March 4. A sale on March 3 of the next year is exactly one year, so it is short term. Sell on March 4 or later and the gain is long term. The holding period entry walks through the anniversary trap with dates.

Most active trading never gets near the line. Positions held for minutes, days or a few weeks are short term, every one of them.

The rates on each side

Net short-term gains are added to your other income and taxed at ordinary rates. For a trader whose results are nearly all short term, the year’s net trading profit simply sits on top of everything else earned that year.

Net long-term gains get their own rates of 0%, 15% or 20%. Which one applies depends on your taxable income, and because the income levels for each rate are reset every year, the place to read them is IRS Topic 409 for the year you are filing, never a figure remembered from an earlier return.

On top of either, the 3.8% net investment income tax can apply once income passes certain thresholds. The IRS publishes those as well.

The same gain, two dates

The rates in this example are illustrative. Your own depend on your income and filing status.

Waiting has a cost. The price can move against you in the extra two months, and a 360 dollar saving on the tax disappears fast if the position gives back more than that, which is why for an active trader the tax line tends to be one input to a sale decision and seldom the one that settles it.

How gains and losses net out

The IRS nets in a fixed order. Short-term gains and losses are netted against each other first. Long-term gains and losses are netted separately. Then the two results are netted against each other.

If the year ends with a net capital loss, up to 3,000 dollars of it comes off your other income, or 1,500 dollars if you are married filing separately. The rest carries forward.

In that year the short-term gains were wiped out by long-term losses before any of them met an ordinary rate.

A bigger loss runs into the cap. A trader who ends a hypothetical year 10,000 dollars down on net takes 3,000 against other income and carries 10,000 - 3,000 = 7,000 forward, so a single bad year can keep showing up on returns for some time afterward. Filing separately while married, the same trader would take 1,500 and carry 8,500.

The order matters when both groups end up positive. A short-term loss first cancels short-term gains, the part of the year that would otherwise meet ordinary rates, and only what survives in each group reaches its own rate.

Run the same year with all 5,000 short term and the hypothetical bill is 5,000 x 0.24 = 1,200. That’s 180 more.

What changes the picture

Wash sales defer losses. Sell at a loss and buy substantially identical shares within the window around that sale, and the loss is disallowed for now and folded into the new position. The window covers the 30 days before the sale and the 30 days after it. A deferred loss comes back into your figures when you sell the replacement shares, which may fall in a later tax year. The detail is on the wash sale page.

IRAs sit outside all of this. Trades inside one aren’t taxed as short-term or long-term gains when they happen. The account’s own rules decide when tax applies, and the holding period of each trade inside it stops mattering.

Mark-to-market trader tax status under section 475 exists, and it changes how a qualifying trader’s gains and losses are treated. The requirements are strict. Go through it with a tax professional before acting on it.

Leaving gains in the account doesn’t delay anything. They are taxed in the year you realize them, whether you ever withdraw a dollar or not, as set out in do you owe tax on trades if you never withdraw.

Checking your own numbers

Your broker’s 1099-B sorts each sale into short term or long term. How to read Form 1099-B shows what to check on each line, including the acquisition dates on shares moved in from another firm, which is where a sale is most likely to land in the wrong group.

Rebuild the year yourself before you file. Sort your closed trades into the two groups, net each one, then net across, and if your totals and the form’s disagree, track down the difference before any of those numbers go on a return. Other tax and records questions are answered with the rest of the trading questions.