I am DSA of HDFC Ltd. and i have GST number because of some other business. now i am getting other income receipt with GST but HDFC has refused to pay Commission inclusive with GST. they are continuous sending me GST notification No.15/2018 dtd.26th July,2018. So, Kindly let me know that HDFC should pay commission with GST or not? if not than where should i fill commission figure in GSTR1?