Free tool
A return costs more than the refund.
Refund, inbound shipping, inspection, unsellable remainder, and lost contribution on the original sale all sit on the same event.
Fully loaded return cost$110.40
Unsellable remainder$11.40
Formula
return_cost = refund + inbound_ship + inspect + (1 − resell_rate) × cogs + original_contribution_lost
Example
An $89 refund with $7 inbound, $3 inspect, 40% unsellable on $28.50 COGS is already over $100 before lost ads.