where do I declare capital gains on sale of a second house?

The sale of a second home is treated as an investment sale, similar to selling stock. Here's how to enter it in TurboTax. If you are using TurboTax Online you will have to use the Premium edition, or you can use any edition of the desktop TurboTax software.

• Go to Federal Taxes > Wages & Income.
• On the screen "Your 2024 Income Summary," scroll down to Investment Income. Click the Start button for "Stocks, Cryptocurrency, Mutual Funds, Bonds, Other."
• "Did you have investment income in 2024?" - Click Yes.
• On the next screen, scroll down to the bottom and click "Skip Import."
• For the investment type, select Other. Click Continue.
• "What type of investment did you sell?" - Select "Second home." Enter all the other information.