This document discusses the time of supply under the Goods and Services Tax (GST) in India. It outlines when the liability to charge GST arises for different types of supplies. For goods, the time of supply is generally the date of invoice or date of removal of goods. For services, the time of supply varies depending on factors like whether payment terms are specified, whether the supply is continuous, or whether the supply is linked to completion of an event. Special cases like advances, interest/penalty charges, and returns are also covered. The document provides guidance on determining the time of supply to correctly charge GST.