Hi,
I'm a sole trader and I buy various types of Refrigerant gas for refrigeration systems that I use occasionally when I need to gas up a system. The refrigerant cylinder I buy comes in 12Kg of refrigerant gas. Now I don't use all the gas at once but I use it when I need too i.e. 2 - 3kg at a time.
When I create an invoice I sell to the customer and make a markup on the gas what account should be used in this instance? Is this an asset or would this be considered an expense, or could I use both?