The correct way to ask a seller to increase the BAC (Buyer’s Agent Commission) being offered is to use this form: Real Estate Brokerage Payment Addendum
Once a change of commission has been agreed upon by buyer and seller, Escrow Instructions are to be written so that there is no misunderstanding between brokerages.
For more information and to review a sample case study, please click on What is the Correct Way to Ask for More Commission?