My understanding is that the standard commission is 6%. Normally that is split up 3% to buyer and 3% to sellers agent when they are different people. As a seller, you generally can not specify what the buyer’s agent gets, and you probably don’t want to dis-incentivize the buyer’s agent. Just assume that the total will be at most 6%. Some buyer’s agents will charge less, just make sure that your seller’s agent does not try to absorb the remaining amount in that case. A friend of mine sold a house, the buyer’s agent had a commission of 2% not 3%. My friend’s seller agent convinced them to renegotiate the contract for the seller’s agent to get 4% at the last minute of the deal.