I agree with the post from Rus. The only fair basis for the commission rebate is a clearly defined statement of work. The rebate should not be based on any other factor. That is how all my rebates are done. I also would advise you to make sure that the rebate is spelled out in writing prior to any offer for any home being submitted. While the rebate agreement is only between you and your broker and has nothing to do with the offer you still want it to be very specific.