What a return really costs you — and the profit calculator built around it
Revenue counts on the units you kept. Shipping, fixed fees and packaging count on the units you shipped. That one asymmetry is why a loss-making SKU can look healthy in a spreadsheet — and it is the rule the iSellerEngine profit calculator is built around, alongside GST, TCS, TDS and the input-credit trap that once turned a real ₹617 loss into a ₹780 profit.