What Is a Buyer's Premium?
A buyer's premium is an additional fee charged to the winning bidder on top of the hammer price (the final bid accepted by the auctioneer). It's expressed as a percentage — commonly ranging from 10% to 25% depending on the auction house and item category. This fee goes directly to the auction house, not the seller.
For example: if you win a lot with a hammer price of $1,000 and the buyer's premium is 20%, your total cost is $1,200 — before taxes or shipping.
Why Do Auction Houses Charge a Buyer's Premium?
Auction houses incur significant costs: cataloguing lots, photography, insurance, staffing, and marketing. The buyer's premium, combined with a seller's commission, is how they generate revenue. It became widely adopted in the fine art and antiques world during the 1970s and has since spread across nearly every auction format.
How Buyer's Premiums Vary
By Auction House Type
- Major international houses (e.g., Sotheby's, Christie's): Often use tiered structures — a higher percentage on lower-value lots, stepping down as the hammer price rises.
- Regional auction houses: Typically charge a flat rate, often 15%–20%.
- Online auction platforms: Premiums vary widely — some charge as little as 5%, others 25% or more.
- Government/liquidation auctions: May charge lower premiums (5%–10%) or none at all.
Tiered Premium Example
| Hammer Price Range | Buyer's Premium Rate |
|---|---|
| Up to $100,000 | 25% |
| $100,001 – $2,000,000 | 20% |
| Above $2,000,000 | 12% |
Note: This is an illustrative example. Always check the specific auction house's fee schedule before bidding.
Other Fees to Watch Out For
The buyer's premium is rarely the only additional cost. Always review the full fee schedule, which may include:
- Sales tax / VAT: Applied to the hammer price plus the premium in many jurisdictions.
- Internet bidding surcharges: Some houses add 3%–5% for online participation.
- Shipping and handling: Especially relevant for fragile, oversized, or international items.
- Storage fees: Charged if you don't collect your lot within the specified time window.
How to Factor the Premium Into Your Maximum Bid
The golden rule: decide your all-in budget first, then work backwards to your hammer price limit. If your budget is $500 and the buyer's premium is 20%, your maximum hammer bid should be no more than $417 (since $417 × 1.20 = $500.40).
- Find the buyer's premium percentage in the auction catalogue or website.
- Divide your total budget by (1 + premium as a decimal). E.g., $500 ÷ 1.20 = $417.
- Use that figure as your hard ceiling when bidding.
- Add estimated taxes and shipping to check your true all-in cost.
Final Thoughts
The buyer's premium is one of the most commonly overlooked costs by new auction participants. Experienced bidders always calculate their true all-in cost before placing a single bid. Taking five minutes to read the fee schedule before an auction can save you from a nasty surprise at the payment stage.