Tax Law, § 1115(a)(18)
Example 1:
A person 16 years of age or older has a garage sale at his residence for three days in a particular calendar year, for which his receipts are $500. Later, during the same calendar year, he has another garage sale, the receipts from which are $100. The first $500 is exempt. Since he exceeded the three-day limit per calendar year, the receipts from the subsequent sale are subject to tax although his total receipts for the calendar year do not exceed $600.
Example 2:
A person under 16 years makes and sells various gift items from his residence. He reasonably expects his receipts to be $600 or less for the calendar year. However, his receipts for the year are $800. The first $600 is exempt from tax and the balance is taxable.
Example 3:
A homeowner has a garage sale and, in doing so, sells an old table and some chairs at his home. The homeowner is not in the furniture business, the sale was for one day, and he sold the table and chairs for $100. The sale was exempt.
Example 4:
A group of neighbors decide to hold a community lawn sale at a common site. The receipts from the sale will be apportioned to the participants based on the items each furnishes. Since the sale is conducted by a group and not by an individual, the sale is subject to tax regardless of the amount or the duration of the sale.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 528.19