There’s not just one but multiple types of invoices that are issued by the taxpayers. Without GST this doesn’t help the seller collect a payment. It’s not only advisable but also necessary as per the GST law for the taxpayers to issue invoices when they make a sale. Thus, an invoice needs to have details like the goods or services that were sold, the quantity of the sold goods or services, price, due payment, tax details, and other terms and conditions, if any. The seller uses these documents to collect assured payments from the buyer as and when it was promised. Invoices are generally the only evidence of a transaction made between a customer and seller to purchase and sell goods or services.