When you sell a property for more than you paid, the profit is a capital gain — and it may be taxable. The IRS taxes real estate gains differently based on how long you held the property and whether it was your primary residence. Short-term gains (held under 1 year) are taxed as ordinary income. Long-term gains (held 1+ years) receive preferential rates of 0%, 15%, or 20%. Primary residence sellers may exclude up to $250,000 ($500,000 for married couples) of gain under Section 121.