29 C.F.R. § 779.260 Trade-in allowances.
Title 29 - Labor
Where merchandise is taken in trade when a sale is made, the annual gross volume of sales or business will include the gross amount of the sale before deduction of the allowance on such trade-in merchandise. This is so even though an overallowance or excessive value is allowed on the trade-in merchandise. In turn, when the trade-in merchandise is sold the amount of the sale will be included in the annual gross volume.
Title 29: Labor
PART 779—THE FAIR LABOR STANDARDS ACT AS APPLIED TO RETAILERS OF GOODS OR SERVICES
Subpart C—Employment to Which the Act May Apply; Enterprise Coverage
Annual Gross Volume of Sales Made or Business Done
§ 779.260 Trade-in allowances.