What it means
A capital gain is simply the difference between what you sold an asset for and what it cost you, including buying and selling expenses. The holding period, meaning how long you owned it before selling, decides whether the gain is classed as short-term or long-term.
The distinction is a tax rule rather than an economic one. A $10,000 profit is the same $10,000 whether it took eleven months or thirteen, but the after-tax amount you keep can differ substantially because the applicable rate changes.
In the United States system the boundary sits at one year: assets held for one year or less produce short-term gains taxed at the seller's marginal income rate, while assets held longer qualify for preferential long-term rates. Other countries draw the line differently or not at all, so the general lesson is to check local rules rather than assume.
Gains are only taxed when realised, meaning when the asset is actually sold. Unrealised increases in value on assets you still hold are not usually taxable, which is why the decision about when to sell is itself a tax decision.
The practical nuance is offsetting. Capital losses can generally be set against capital gains of the same character first, so a trader with $20,000 of short-term gains and $8,000 of short-term losses is taxed on the $12,000 net figure rather than on the gross gain.
In practice
Real-world examples.
Example
An employee sells shares from a vesting award four months after they vest, at a profit of $14,000. The gain is short-term, so it is added to her salary income for the year and taxed at her marginal rate rather than at the lower long-term rate.
Example
An active trader closes 60 positions during the year with gains of $85,000 and losses of $37,000, all held for under a year. Only the net $48,000 is taxed, and the trader sets aside cash quarterly because no tax is withheld at source on trading profits.
Example
A small business owner sells a piece of surplus equipment eight months after buying it and books a $9,000 gain. Her accountant flags that the short holding period pushes the gain into ordinary income and changes her estimated tax payment for the quarter.
Think of it
“Short-term gain is profit on assets held under a year-taxed as regular income.
Formula
Calculation
Short-term capital gain = net sale proceeds - cost basis
Tax due = short-term capital gain x ordinary income tax rate
An investor buys 400 shares at $50.00 each, paying $20,000 plus a $20 commission, giving a cost basis of $20,020. Five months later she sells the shares at $78.00 each for $31,200, less $20 in selling costs, giving net proceeds of $31,180. The short-term capital gain is $31,180 - $20,020 = $11,160, and at a 32% marginal income tax rate the tax due is $11,160 x 0.32 = $3,571.20, leaving $11,160 - $3,571.20 = $7,588.80 after tax. Had she held the shares for just over a year and paid a 15% long-term rate instead, the tax would have been $11,160 x 0.15 = $1,674.00, a saving of $3,571.20 - $1,674.00 = $1,897.20 for waiting.Case study
Seen in the real world.
Fenwick Lane Advisory is a fictional wealth management practice used here for an illustrative example of holding period planning. One of its invented clients held a technology position bought eleven months earlier that was showing a $180,000 unrealised gain, and he wanted to sell immediately to fund a house purchase.
Fenwick Lane's adviser modelled both routes. Selling at once meant a short-term gain taxed at his 35% marginal rate, costing $180,000 x 0.35 = $63,000, while waiting five more weeks to pass the one year mark would have taxed the same gain at 15%, costing $180,000 x 0.15 = $27,000, a difference of $36,000.
In this illustrative case the client waited, using a short bridging loan costing about $2,500 to cover the timing gap on his purchase. The fictional point is not that waiting always wins, since the share price could have fallen by far more than $36,000 in five weeks, but that the tax consequence of a holding period deserves to be part of the decision rather than an afterthought.
Watch out
Common mistakes.
- Counting the holding period from the settlement date or the payment date rather than from the trade date, which can put a sale on the wrong side of the one year line.
- Forgetting to include commissions and other transaction costs in the cost basis, which overstates the gain and the tax due on it.
- Assuming an unrealised gain is taxable, when tax generally only applies once the asset has actually been sold.
Questions
People also ask.
How long is short-term?
Under the United States rules, a holding period of one year or less, with the long-term rate applying from one year and one day.
Can losses reduce a short-term gain?
Yes, capital losses are generally offset against gains of the same character first, and any excess may then reduce other gains or a limited amount of ordinary income.
Does it apply to assets other than shares?
Yes, the same holding period logic applies to bonds, funds, property and other capital assets, although some asset types have their own special rates or rules.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%