If you sold a personal item for less than you paid for it, the income is not taxable. Don't enter it at all. If you sold a personal item for more than you paid for it, enter it as an investment sale, under "Stocks, Cryptocurrency, Mutual Funds, Bonds, Other." On the screen that asks for the investment type click Other. On the screen where you enter the details of the sale, where it asks what type of investment you sold, select "Personal items."
