Treatment of cash discount in gst

Sumeet Gupta (123 Points)

16 October 2017  
A company has a policy of allowing a cash discount of 10 percent if a customer pays a particular invoice within 10 days. If the company sells goods worth Rs. 100 to a customer and the customer pays the invoice within 10 days to avail the discount.
How to deal with this cash discount in gst return and do I need to reverse itc corresponding to this cash discount?