Hello, I sometime sell vintage transports items (mainly bicycles) by commission for the owners. I.e, a customer gives me a bicycle to sell. We agree a sales price. I market and sell the bicycle at that price. Then pay then original owner minus my commission percentage. Is this percentage classed as 'cost of goods for resale', or is it classed as something else. 

I use quickbooks self-employed. Is there a way of recording and issuing both parties via invoicing? 

Regards, Tim