Currently banks commission structures are percentage based. But what I should have said is the percentage structure would probably be linked to pricing bands, i.e. the percentage decreases the higher the mortgage amount but there has to be a minimum base level which covers the cost of doing business. Also your assuming there is the same amount of work involved in all mortgage cases. The more money your looking for, the more diligent the banks are (more risk to them) in their requests for information, which creates more work for the broker in getting the correct info from the client and preparing it for the bank