The hammer price is the final winning bid amount when the auctioneer drops the gavel. It does not include the buyer’s premium, sales tax, shipping, or any other fees — it’s just the bid number itself.
Hammer price is the headline number quoted in auction reports (“Picasso painting sold for $50 million at Sotheby’s”) even though the buyer’s actual cost is significantly higher after the BP. It’s also the number on which the seller’s commission is typically calculated. When auctioneers tell consignors “the hammer was $1,800,” that’s distinct from what the consignor will receive after fees.
The hammer is one of the most universal symbols in commerce. The auctioneer’s gavel falls, the deal is done, and ownership transfers at that instant under the legal doctrine of “auction sale.” In digital auctions, the “hammer” is the close-time tick that locks in the winning bid. The legal force is identical: the lot is sold to the highest bidder at the moment of close, with no further negotiation possible. This is why post-hammer disputes are usually resolved through small-claims litigation rather than offer-and-acceptance reasoning — the contract was already formed.