These gains don't cause pain. A capital gain is the amount of money you pocket by selling one of your investments for more than you paid for it. Technically, capital gains only count for what's called a capital asset, but that's really just anything you own for investment purposes. Stocks and bonds obviously qualify, but your house and household furnishings can also count.

For tax purposes, capital gains are classified as either long-term (held for more than one year) or short-term (held for less than one year) and there are different tax implications for how long you hold onto a capital asset. For most long-term capital gains, you're taxed no more than 15% of the value of the asset. Short-term gains get taxed as regular income, so you pay the rate for the tax bracket you're in.

Capital gains can also be realized or unrealized. When you physically sell an asset like a stock, you've realized the capital gain. When you're holding the stock, and it has a value over its purchase price, but you're not selling it, you've got an unrealized gain, and you won't realize it until you sell.

In a perfect world, we'd all have capital gains. But no one¿s that smart or lucky. When the value of an asset at sale is below what you've paid for it, it's called a capital loss. The good news is that the government lets you count that loss against any gains you've had, lowering the taxes you pay. In fact, many people who sell a stock that has risen far over their purchase price tend to sell some stinkers, too, at the same time for the tax benefit. This is known as a capital-loss offset.