How to Issue a credit note to party against Tax Rate Difference

Pankaj Sanghotra (.) (13 Points)

09 May 2018  
Please let me know that how to Issue a credit note to party against Tax Rate Difference.
For Ex.
I have billed a product in wrong tax rate 12% and dispatch.
& later I got that actual tax rate is 5% against billed product.
How to give credit to party in this case?