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Three figures determine what a lot at auction costs you, and only one of them is the amount you pay. The estimate is the auction house’s guide to a likely selling range. The reserve is the seller’s confidential minimum. The hammer price is the winning bid when the auctioneer closes the sale. The buyer’s premium and any other charges are then added to the hammer price, and that total is what appears on your invoice.
The mechanics below come mainly from Christie’s and Sotheby’s published guidance on fine-art sales. Watch lots at any house, and property sales at any auctioneer, are governed by the terms printed for that specific sale, so check the lot page and conditions of sale before you bid.
What is an auction estimate?
An estimate is a specialist’s view of what a lot may achieve, normally published as a low-to-high range. Christie’s says its specialists weigh the maker or artist, rarity, condition, provenance, exhibition history, current demand and the prices of comparable sales, and they do this in consultation with the consignor. For a watch, the features a buyer should check on the lot page are the same kinds of points: condition, completeness, and the documented history of the piece.
Christie’s states in its auction help library: “An estimate is a guide to a lot’s expected selling price, but it is not a guarantee of the final price.” The estimate is therefore not a promised outcome. Bidding can finish above or below the range.
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Two further points matter when you read an estimate:
- Estimates exclude buyer’s charges. Christie’s says estimates are generally expressed before the buyer’s premium and other charges. Sotheby’s says its pre-sale estimates exclude the buyer’s premium, any overhead premium, Artist’s Resale Right, and VAT.
- Estimates can change. Sotheby’s states that pre-sale estimates are guides and can be revised. Look at the current lot page rather than an earlier catalogue or printed list.
For context on how estimates have compared with results, Christie’s reports that across its sales in the first half of 2026, hammer prices averaged 24% higher than low estimates. This is Christie’s own figure for its sales in that period. It is not an industry-wide rate, and it is not a forecast for any individual lot.
What is a reserve price at auction?
The reserve is the confidential minimum price the seller will accept. Christie’s says the reserve is agreed with the auction house and sits at or below the low estimate. If bidding reaches the reserve, Christie’s says the lot is guaranteed to sell to the highest bidder. If bidding falls short, the lot is passed or “bought in,” and no transaction takes place.
Two practical points follow:
- The reserve is often not disclosed. Do not assume you can see it. Some houses or sales may show more information than others, so check the conditions for the sale in question.
- The auctioneer may bid for the seller. Sotheby’s buyer guide says an auctioneer may place bids on the seller’s behalf up to the reserve. Bidding that appears to be competitive near the reserve may therefore include bids that are not from another buyer.
Reserve mechanics are not uniform. In the UK property-auction context, RICS notes that a property seller may fix the reserve nearer the auction date in light of marketing interest, which is a different timing pattern from the fine-art examples above.
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What does “reserve not met” mean?
“Reserve not met” means bidding stopped below the seller’s minimum. The lot is passed or “bought in,” meaning it did not sell at that auction. No sale is concluded, and you do not owe a hammer price or premium for that lot. Whether the lot is later offered or what happens to it afterward depends on the terms of that sale, so read the conditions rather than assuming a second chance.
What is a buyer’s premium?
The hammer price is the final accepted bid. It is not the full amount the buyer pays. The buyer’s premium is added to the hammer price and paid by the winning buyer. The invoice may also include taxes, shipping, overhead premiums, or other charges, depending on the sale and on the buyer’s location.
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The premium is often tiered, which means it is not one flat percentage. Christie’s buyer’s premium schedule has recently shown the following structure: 28% on hammer prices up to £1.5 million (US$2 million in US-dollar sales), 22% on the portion above that threshold up to £6 million (US$8 million), and 15% on amounts above those thresholds. Treat these rates as a snapshot. They change, they differ by currency, and they apply only to the sale for which they are published. The figures do not describe the fees of other houses or other regions.
Read tiers as bands applied to each slice of the hammer price. The table below shows the calculation for a £2,000,000 hammer price, using the schedule described above as an illustration.
| Band of hammer price | Amount in band | Rate | Premium on that band |
|---|---|---|---|
| Up to £1,500,000 | £1,500,000 | 28% | £420,000 |
| £1,500,000 to £6,000,000 | £500,000 | 22% | £110,000 |
| Total | £2,000,000 | £530,000 |
On that hammer price, the premium is £530,000 and the amount before taxes and other charges is £2,530,000. A £100,000 hammer price that falls wholly within the first band would carry a 28% premium of £28,000, giving £128,000 before other charges. Do not apply a single percentage to the whole hammer price unless the sale’s published schedule states that it works that way.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does the auction estimate include the buyer’s premium?
No. The estimate and the premium belong to different stages of the cost. A lot estimated at £100,000 to £150,000 that sells for £150,000 on the hammer will cost more than £150,000 once the premium is added. The top of the estimate range is therefore not a ceiling on what you will pay.
How much will I actually pay if I win an auction lot?
Use this framework:
hammer price + buyer’s premium + applicable taxes and other charges = estimated total payable
- Set a maximum total spend. Decide the most you will pay in total, not only the highest hammer bid. Work backward from that total to find the bid level that keeps you within it.
- Read the conditions for the specific sale. Find the buyer’s premium schedule and any overhead premium in the conditions of business. Christie’s publishes its fee information in its understanding auction fees guide and its financial information for buyers page. Sotheby’s sets out buyer terms in its Guide for Buyers: Global.
- Use the lot-page cost calculator for a quick figure. Christie’s says a cost calculator on the lot page can provide a fast total-cost estimate. Treat the result as a check, and confirm it against the sale’s current information.
- Check the costs that sit outside the premium. Include taxes, shipping, import costs, and any lot-specific terms. These depend on the sale and on where you are buying from.
- Confirm the currency basis. Sotheby’s says estimates in currencies other than the sale currency may use the exchange rate in force when its catalogue was published, not the rate at invoice time. Treat those converted figures as approximate.
- Recheck before you bid. Estimates and terms can be revised late. Look at the lot page on the day of the sale, not only at the catalogue.
Where fine-art rules do not carry over
Property auctions have their own contracts and legal framework. RICS’s consumer guide to property auctions explains that these sales can involve separate legal packs, special conditions, and local rules. For property, look in the legal pack and special conditions for any buyer’s premium, administration charge, or costs the seller may pass on, such as legal or surveying fees. Do not assume that the fine-art pattern of estimate, reserve, hammer, and premium applies in the same way.
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When you compare two lots or two auction houses, put the same items side by side:
Quick Recap
- Estimate range and whether it has been revised
- Whether the reserve is disclosed, and how it relates to the low estimate
- The buyer’s premium rate, and whether it is tiered
- Overhead premiums, taxes, shipping, and import costs
- The sale currency and the exchange-rate basis for any converted figures
- The auction format and the jurisdiction whose rules apply
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
