A seller of assist of $4,800 on an $80,000 purchase is 6%, which is permitted. Seller concessions such as a seller assist is common and should not necessarily deter a seller from accepting an offer. To strengthen your offer, you will want to make sure the rest of your agreement and terms are sound (tighten the contingencies (if possible), provide a pre-approval letter from a lender, and provide a completed BFI). Many times, these items are the difference between getting an offer accepted or rejected. My law firm specializes in residential real estate transactions. I offer a free consultation to buyers or sellers. I would be happy to assist further.