Let’s say there was increase in tax rate from 18% to 20% w.e.f. 1.6.2017. What is the tax rate applicable when goods are supplied and invoice issued after change in rate in June 2017, but full advance payment was already received in April 2017?

hellloooooo

The new rate of 20% shall be applicable as goods are supplied and invoice issued after 1.6.2017