A Rent Agreement can be served as an address proof in many places such as while registering for GST. GST stands for Good and Services Tax which is a compulsory tax that all the citizens of the country are required to pay to the Government. All the businesses related to the Consumer food products and Businesses dealing with other Services pay it to the Government. This tax is levied on the food products and services of the consumer combined with the original price of the product. So the burden of the tax is not felt by the consumers when they pay for it.
https://www.edrafter.in/rent-a....greement-for-gst-reg