Hammer price meaning: what you pay after the premium
Updated
Hammer price meaning, in one line: the hammer price is the last bid the auctioneer accepts. That is the whole meaning, and the one number in a wine auction that is neither what the buyer pays nor what the seller banks. Sotheby's calls it "the final bid accepted". Zachys puts the mechanics plainly: "The fall of the auctioneer’s hammer signifies acceptance of that bid as the “hammer price” and the formation of a binding contract of sale between the Seller and Buyer." Section 57 of the Sale of Goods Act 1979 fixes it: a sale by auction "is complete when the auctioneer announces its completion by the fall of the hammer, or in other customary manner". From there it splits two ways. The buyer has a premium added: 24% plus a 1% overhead premium at Sotheby's on wines and spirits, 24% at Bonhams UK, 25% at Zachys, 17% at WineBid. The seller has commission taken off: iDealwine charges 13% excluding tax. One hammer, two invoices, and neither shows the hammer as the total.
What does hammer price mean in a wine auction?
It means the price at which one lot was knocked down. Not the sale, not the case you happened to be watching, but the lot, which WineBid defines as "the organizing unit of all auctions" and which "may include a single bottle, a bottle and case, or any combination of bottles and bottle sizes of a particular wine, or may be made up of a combination of different wines".
That per-lot framing is legal, not editorial. The Sale of Goods Act treats each lot as "prima facie deemed to be the subject of a separate contract of sale". So a sale can produce two hundred hammer prices and two hundred contracts, and the fact that lot 47 went cheap tells you nothing binding about lot 48.
Houses use their own wording for the same thing. Zachys defines it as the final bid price and calls that amount the hammer price. WineBid uses the same term. They all mean the number the auctioneer stopped on.
Why is the hammer price not what you pay?
Because the houses add the premium and tax on top, and they put that in the definition itself. Zachys is the clearest: "The purchase price payable by the Buyer ("Purchase Price") will be the sum of the final bid price (the "Hammer Price"), the Buyer's Premium and the Protection Fee, when applicable, together with any applicable sales tax."
Sotheby's says the premium "is added to the hammer price of each lot offered and is payable by the buyer". WineBid: "A 17% buyer's premium is added to the final hammer price of all lots purchased through auction."
Here is what 100 units of hammer becomes at each house, on published rates, before local taxes:
| House | Published wine rate | 100 of hammer becomes |
|---|---|---|
| Sotheby's, global wines and spirits | 24% of hammer, plus a 1% overhead premium on all hammer prices | 125 |
| Bonhams UK | 24% of the hammer price, wine and whisky | 124 |
| Zachys | 25% of hammer, plus a Protection Fee of 1% of hammer plus premium when Zachys arranges delivery | 125, or 126.25 with the fee |
| WineBid | 17% of the final hammer price | 117 |
| iDealwine | 21.5% excluding tax, 25.8% including tax, in force since 27 March 2026 | 125.80 including tax |
Then tax. Bonhams states that "VAT at the current rate of 20% will be added to the Buyer's Premium and charges", and GOV.UK gives 20% as the standard rate on "most goods and services". So a £100 hammer at Bonhams UK is £124 of premium-inclusive cost and £128.80 once VAT lands on the premium. The house-by-house premium comparison has the full schedule, and the landed-cost calculator adds duty, shipping and storage for a delivered number.
Bid, ask and hammer: what is the difference?
A bid is what one buyer offers, an ask is what one seller wants, and a hammer is the only one of the three where both sides agreed.
A bid is provisional until it isn't. Section 57 of the Sale of Goods Act says that "until the announcement is made any bidder may retract his bid". Up to that moment your bid is an offer with no contract behind it.
An ask is a wish with a price on it. A merchant listing a case at £2,400 has told you what they would like. Nobody has agreed to it. The case can sit at that ask for a year, and the ask never records a refusal.
A hammer is a completed transaction. It carries a date, it names a lot, a format and a bottle count, and it bound two parties. That is why hammer prices are the only one of the three worth building a valuation on, and why an asking price on its own is close to useless for deciding what to bid.
How does the hammer land on the number it lands on?
Through the increment ladder and the underbidder, not through anyone's valuation of the wine.
Every house publishes an increment table. Zachys moves a bid up by $10 between $0 and $100, by $20 between $100 and $500, by $50 between $500 and $1,000, and by $2,000 once bidding passes $20,000. WineBid runs seven tiers, from $1 on bids of $1 to $99 and $10 from $100 to $299, up to $500 on $5,000 and up. A lot cannot stop between rungs.
Proxy bidding does the rest. WineBid explains that once you set a maximum, "our system will auto bid on your behalf against other bidders until your maximum is reached". So the hammer stops one increment above the second-highest bidder's ceiling. The winner's true maximum is never revealed, and never appears in the record.
That is the single most useful thing to understand about a hammer price: it measures the underbidder, not the winner. One result is one person's ceiling plus a rung. A run of results across sales is a market. Wines with deep, continuous secondary trade like Pétrus and Dom Pérignon give you the run. Thinly traded lots give you the rung.
What does the seller actually get from the hammer?
The hammer minus commission, which is why the same number appears on two invoices at two different totals.
iDealwine publishes its seller's side plainly: the operator charges "13% (excluding tax) or 15.6% (including tax) of the Hammer Price". HMRC builds both sides off the same base in its auctioneers' scheme guidance: "Your purchase price is the hammer price less any commission charges you make to the seller" and "Your selling price is the hammer price plus any charges for services you make to the buyer". HMRC then names what has to go into those charges: seller's commission, buyer's premium, and any other charges made to the buyer "for incidental expenses such as packing, transport and insurance costs".
Put iDealwine's two published rates on one €100 hammer and the spread is visible. The buyer pays €125.80 including tax. iDealwine charges the seller 15.6% including tax, leaving €84.40 before anything else is deducted. That is €41.40 of distance between the two parties on a €100 lot, all of it created by a number neither of them pays. If you are on the selling side, what you net after commission is the calculation that matters, not the hammer you read in a results list.
Can you compare a hammer price to an estimate, or to a shop price?
To an estimate, yes. To a shop price, only after you gross it up. Estimates and reserves are quoted on the same basis as the hammer. Zachys states that "Catalog estimates reflect anticipated hammer prices and are based on past sales and market research", and that "Lots may carry a confidential reserve, which is the minimum price agreed upon with the consignor". iDealwine says a reserve "cannot be higher than the low estimate and by default, this price is set at the low estimate", and lets consignors sell with no reserve, in which case "the starting price will be set at €1". The Sale of Goods Act permits the whole arrangement: a sale by auction "may be notified to be subject to a reserve or upset price". Estimate, reserve and hammer are three points on one scale.
A merchant's price is on a different scale. To compare, divide rather than subtract: at Bonhams UK, take the merchant's price for the same wine at the same duty status and divide it by 1.288, and you have the highest hammer that still beats the shop. Skip that division and you can pay more at auction than the same case lists for on a shelf. The fine wine market index tracks the auction side of that comparison over time.
What else moves the hammer on the same wine?
Format, provenance and fill level, and the auction record prices all three.
Condition is the one buyers underweight. A bottle whose fill runs ahead of its age is priced as damage rather than as age, and the discount arrives at the hammer rather than in a footnote. The ullage and fill level guide covers what each house publishes for each band. Format matters as much on some wines as vintage does: magnums and original wooden cases of Romanée-Conti clear on a different ladder from single bottles in no original packaging, and a hammer quoted without the format attached is not comparable to anything.
See every hammer a bottle has ever made
You stop guessing what to bid when you can see what the wine has already sold for, sale after sale, with the format, the fill and the date attached. Every wine page on this site carries its full auction price history, so the number you set your maximum against is a record of real transactions rather than a merchant's asking price or a single result someone quoted at you.
Join the newsletter and we will send you the week's notable results with the premium already applied, so the number in your inbox is the number that would have left your account. Start with how to buy wine at auction if you have not bid before, or the £1,000 hammer cost breakdown if you want every line of the stack itemised first.