Fees to attend yoga classes are not taxable. However, monthly gym memberships that include access to yoga classes and all the other gym classes and equipment are taxable if the charge for the use of the facility is a significant part of the total cost of the lessons.
If the charge to attend a yoga class is listed separately from the monthly gym membership, the yoga fee is not taxable.
Sales or rentals of yoga mats or towels are taxable. You do not pay sales or use tax when you purchase these products. Instead, give your supplier a completed Form ST3, Certificate of Exemption, and specify the resale exemption.
A gym/yoga studio that provides free yoga mats or towels to their customers who work out at the facility must pay sales or use tax on their purchase of these items.