What it means
A reserve price is different from a starting bid, which is simply the level at which bidding opens. Auctions often open low to create momentum while a higher, undisclosed reserve sits behind the scenes, so an item can attract lively bidding and still fail to sell.
For a seller the reserve is a risk control. It caps the downside of an auction, which is a price discovery mechanism with genuinely uncertain outcomes, and it is particularly important where the item is illiquid or the bidder pool is small.
The cost of a reserve is reduced participation. Bidders who suspect a high hidden reserve may not turn up at all, and unsold lots carry a stigma that makes them harder to sell later, which is why experienced sellers set reserves at a defensible floor rather than a hopeful target.
Setting the number should work backwards from the seller's net position rather than forwards from optimism. Start with the cash the seller must actually clear, add any costs of sale that are fixed, then gross up for the auctioneer's commission, which is charged as a percentage of the hammer price.
Reserves appear well beyond traditional auction rooms. Online marketplaces, government spectrum auctions, insolvency sales of plant and machinery and advertising exchanges that set a floor price on impressions all use the same underlying idea.
In practice
Real-world examples.
Example
A family selling a commercial building sets a reserve of $1,250,000, based on the mortgage payoff plus legal fees. Bidding stalls at $1,190,000, the property is passed in, and it later sells privately at $1,240,000 to the underbidder.
Example
An insolvency practitioner auctioning restaurant equipment sets deliberately low reserves, because the objective is a quick, complete clearance rather than the best possible price on each individual lot.
Example
A digital advertising publisher sets a floor price of $4.00 per thousand impressions on its premium inventory. Fill rates fall, but average revenue per thousand impressions rises from $3.60 to $4.40 because low-value bidders are excluded.
Formula
Calculation
Reserve price = (net proceeds required + fixed costs of sale) / (1 - commission rate).
A construction firm is selling a used excavator at auction. It must clear $180,000 to repay the outstanding finance on the machine, and the auction house charges a seller's commission of 10% of the hammer price. Reserve price = $180,000 / (1 - 0.10) = $180,000 / 0.90 = $200,000.
Checking it: if the hammer falls at $200,000, commission is $200,000 x 0.10 = $20,000, leaving $200,000 - $20,000 = $180,000 net, exactly what is required. Now suppose the firm must also pay $9,000 to transport the machine to the saleyard. Required net rises to $180,000 + $9,000 = $189,000, and the reserve becomes $189,000 / 0.90 = $210,000, which shows how quickly small fixed costs push the floor upwards.Case study
Seen in the real world.
Ashfield Vineyard Estates is a fictional business created for this illustrative example. It decided to auction a 40-hectare parcel of land it no longer farmed, and the owners set a reserve of $2,400,000 based on what a neighbour had reportedly been offered two years earlier.
Auction day drew nine registered bidders, and the bidding climbed briskly to $2,080,000 before stalling. The lot was passed in, the result was published, and over the following months every enquiry opened at a number below $2,080,000 because buyers now knew both the ceiling of the room and that the seller had failed to sell.
The parcel eventually sold eleven months later for $2,150,000, less than the auction had already delivered on the day once the extra holding costs and second marketing campaign were counted. The illustrative moral is that a reserve should be anchored to the seller's genuine walk-away number and current comparable evidence, not to an anecdote, because an unsold lot is not a neutral outcome.
Watch out
Common mistakes.
- Confusing the reserve price with the guide or starting price, then feeling misled when bidding above the guide still fails to trigger a sale.
- Setting the reserve at the price the seller hopes for rather than the price below which they would genuinely refuse to sell.
- Forgetting that commission and selling costs come out of the hammer price, so a reserve equal to the amount owed leaves the seller short.
Questions
People also ask.
Is a reserve price the same as a starting bid?
No, the starting bid is the visible level at which bidding opens, while the reserve is usually confidential and sits at or above that level.
What happens if no bid reaches the reserve?
The item is unsold or passed in, and the seller can negotiate privately afterwards, relist it later or accept a lower offer.
Should every auction have a reserve?
Not necessarily, since genuine no-reserve auctions attract more bidders and can produce higher prices, but they expose the seller to a poor result if turnout is weak.
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