Value of supply: transaction value rule defines taxable value including specified charges and linked subsidies. Value of supply is the transaction value-the price actually paid or payable where parties are not related and price is sole consideration. The value includes non GST taxes charged separately, amounts paid by recipient on supplier's account, incidental expenses (commission, packing), amounts for acts done at or before delivery, interest or late fees, and subsidies directly linked to price (included for the subsidy recipient). Discounts are excluded if invoiced at or before supply or if post supply discounts are contractually agreed and attributable input tax credit is reversed. Related persons are defined by specified relational criteria.