Your booth at the antique mall qualifies as a small business. You'll enter all your income and expenses just as if you had your own store.
Expenses include the cost of the items that you sold as well as the rent that you paid for the booth itself and any other costs associated with running the booth.
Scroll down in the 'Wages and Income' section of TurboTax to 'Business Items' and click on 'start' next to 'Business Income and Expenses'. The system will walk you through all of the steps.
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