Capital Gains

A capital gain is the profit from selling an asset such as stock, property, or crypto for more than you paid. The crucial part is that it arises on sale. However much the price rises while you hold, that is only an unrealized gain; it becomes a taxable capital gain when you sell and lock the profit in.

This makes it different in character from dividends and interest. Those arrive while you hold and are taxed each time they are paid, whereas with a capital gain you choose when the sale happens. Because of that, holding for a long time defers the tax and lets the money that would have gone to it keep compounding.

Tax rules vary widely by country and asset type. Some assets carry lower rates or larger deductions the longer you hold them, some are exempt up to a threshold, and in many places selling a losing position in the same year to offset a gain is allowed. So it is worth checking which rules apply to your specific holdings before you sell.

A common mistake is deciding to sell on the return alone. A 20% gain can leave much less in hand once tax and trading costs come out, and whether you sell in December or January can even shift the gain into a different tax year. Getting into the habit of calculating the after-tax figure before hitting sell genuinely changes your real return.