Ordinary income tax and capital gains tax are two separate rate structures that apply to different types of income. Ordinary income — things like wages, freelance income, and most interest — is taxed at graduated rates ranging from 10% to 37% depending on your total income. Capital gains, which come from selling assets like stocks, real estate, or a business, are taxed at different rates depending on how long you held the asset. Short-term gains on assets held a year or less are taxed at ordinary income rates, but long-term gains on assets held more than a year get the benefit of rates of 0%, 15%, or 20%. Understanding the difference matters because where your income comes from can have a much bigger effect on your tax bill than your total income level alone.