Auction Guarantees and Irrevocable Bids Explained

⁰¹An auction guarantee is a promise to the consignor that a work will sell for at least an agreed amount, whatever happens in the room. If bidding falls short, the guarantor makes up the difference or takes the work. If bidding goes higher, the seller receives the higher price, and the guarantor often shares in the upside on agreed terms.

⁰²Houses offer guarantees mainly to win consignments. A seller choosing between competing houses, or deciding whether to sell at all, may prefer certainty to an estimate. For the house, a guarantee is a way of securing important works for a sale, at the cost of taking on price risk.

⁰³When the house carries that risk from its own resources, it is usually described as a house or in-house guarantee. The risk can then be passed on, in whole or in part, to an outside party.

⁰⁴Guarantees are usually agreed well before the sale, while the catalogue is being assembled, and they are normally tied to terms that affect the seller's proceeds. A consignor who accepts a guarantee may give up part of the upside above it in exchange for certainty, so a guaranteed sale is a negotiated outcome for the seller as well as a public event for bidders.

⁰¹An irrevocable bid is a commitment, made before the sale by a third party, to bid up to a set amount on a lot. Because the bid cannot be withdrawn, the lot will sell for at least that amount. Irrevocable bids are a common way for houses to lay off guarantee risk to outside parties.

⁰²The third party is typically compensated for taking the risk. At the major houses, if someone else outbids them, the irrevocable bidder generally receives a fee; if they win, they buy the work, and depending on the arrangement a fee or credit may reduce what they effectively pay. The details differ between houses and are summarised in their conditions of sale and catalogue notices.

⁰³For the market, the effect is that a committed buyer at a known level exists before the auction begins. Bidding in the room is then competition against that floor.

⁰¹Major houses disclose guarantees rather than conceal them, but the disclosure is compressed into symbols and short notices that are easy to pass over.

⁰²Disclosure tells a reader that an arrangement exists. It generally does not reveal the guaranteed amount, the guarantor's identity or whether the guarantor ended up buying the work. Those details are usually left to inference.

⁰³Readers relying on online results rather than printed catalogues should check that the symbols have carried over, since results listings do not always reproduce every catalogue notice.

⁰¹A lot that sells well above its guarantee, with several bidders pushing past the floor, shows genuine competition. The guarantee set a minimum, and the market went beyond it.

⁰²A lot that sells at or near the guarantee level, perhaps on a single bid, proves much less. It may have gone to the irrevocable bidder at a level agreed before the sale, adjusted by a fee that the published figure does not show. That is a completed transaction, but it is closer to a pre-negotiated sale than to evidence of open demand.

⁰³Guarantees also change what sale-level statistics mean. A sale with many guaranteed lots will show few unsold works, so a strong sell-through rate may partly reflect arrangements made in advance. Totals look steadier than underlying demand, which is useful to consignors and misleading to anyone reading the total as a measure of appetite.

⁰⁴None of this makes guaranteed results worthless. A sophisticated party committing capital at a given level is itself information about how someone valued the work. It is simply a different signal from a room of competing bidders.

⁰¹Appraisers, advisors and collectors regularly rely on recent auction results as comparables. Where a guarantee was involved, a few checks change how much weight the result can carry.

⁰²Where the answers point to a pre-arranged outcome, the result is better treated as a floor that one party accepted than as a market price that several parties confirmed.

⁰¹The use of guarantees has historically varied with how hard houses compete for consignments and with their appetite for risk. Changes in how many lots are guaranteed can therefore shift headline results from one season to the next, independently of what collectors are doing.

⁰²For anyone reading auction evidence, the principle is the one that runs through this site. A published result is a signal about one transaction under specific terms. Guarantees are among the most important of those terms, and a reading that ignores them treats an arrangement as though it were a verdict.