Straight Bidding vs Proxy Bidding: Which Method Protects Your Budget

Every timed online sale forces a decision before the first bid: leave a maximum and let the platform execute it, or return to the screen and enter each step by hand. Straight bidding vs proxy bidding is a question of temperament as much as mechanics, and the answer decides whether a collector finishes inside the ceiling set at the viewing. A proxy bid, also called a maximum bid or an absentee bid, is a standing instruction to bid on your behalf at the smallest permitted step until a stated limit is reached. A straight bid is a single amount entered manually, applied at once, and left behind unless you return.

Key takeaways:

• Phillips states in its Conditions of Sale, effective 12 April 2026, that its staff "will attempt to execute an absentee bid at the lowest possible hammer price taking into account the reserve and other bidders".
• Christie's confirms that identical maximums are settled by the clock, since the first bid received takes precedence.
• The Phillips UK Auction Buyer's Guide advances lots between GBP 5,000 and GBP 10,000 in GBP 500 steps, and lowers a non-conforming absentee bid to the next increment.
• Adam, Ku and Lux reported in the Journal of Experimental Social Psychology in 2019 that high-arousal bidders lifted final prices by 19.4% and 8.1% of item value against a low-arousal control.

How a proxy maximum executes: straight bidding vs proxy bidding at the mechanical level

Christie's separates the two in its online-auction guide: a quick bid "allows you to place the next sequential bid on a lot in real time", while a max bid "sets the highest bid you are willing to place on a lot and continues to bid on your behalf until that bid is exceeded". The Phillips Conditions of Sale refuse any absentee instruction carrying no maximum amount.

The bid increment is the fixed step by which a lot advances, published in the conditions of sale. Phillips specifies that an online bidder "may only place a bid in a whole bidding increment", so the engine never splits the difference. Christie's reopens a lot for three additional minutes when a bid lands within three minutes of closing, which is how the soft close defeats a late straight bid.

Emotional distance and the discipline each method imposes

Auction fever is documented and measured. Gillian Ku, Professor of Organisational Behaviour at London Business School, defined it in 2005 with Deepak Malhotra and J. Keith Murnighan as "the emotionally charged and frantic behavior of auction participants that can result in overbidding". In 2019, with Marc T. P. Adam of the University of Newcastle and Ewa Lux of the Karlsruhe Institute of Technology, Ku measured the mechanism in the Journal of Experimental Social Psychology: across 118 participants wearing ECG chest straps, the high-arousal group registered a cardiac sympathetic index of 3.52 against 2.80 for the low-arousal group and bid significantly higher. A further experiment on 235 participants found bidders unaware of the effect. What this establishes for straight bidding vs proxy bidding is the source of the arousal: a symbol-matching task and background music, both outside the sale. A proxy maximum is entered once, in the state the collector occupied when they set it, beyond the reach of the psychology that makes smart collectors overpay.

What does the last increment actually cost?

The single step is where straight bidding vs proxy bidding stops being a matter of taste. Take a contemporary work estimated at 6,000 to 8,000 euros in a timed sale whose ladder advances by 500 euros between 5,000 and 10,000. Collector A leaves a round 7,000 euros. Collector B leaves 7,600 euros, and under the Phillips rule that an absentee bid failing to conform to the published increments "may be lowered to the next bidding increment", B's instruction executes at 7,500 euros. The engine walks the lot up in 500-euro steps, A's maximum is reached at 7,000, and B takes the work at 7,500.

Price that step before setting the number. At a buyer's premium of 20%, a hammer of 7,000 euros costs 8,400 euros and one of 7,500 euros costs 9,000, so the increment A declined to fund was 600 euros of outlay. Phillips instructs bidders to state a maximum "excluding the Buyer's Premium and VAT", which makes the ceiling and the invoice two different figures. Our method for setting your ceiling on what a work is worth to you starts from the invoice.

Six checks before you leave a maximum

A maximum is a written instruction the house executes without consulting you, so it earns the scrutiny you give the condition report. These six checks apply whichever side of straight bidding vs proxy bidding you land on.

1. Ceiling in total cost. Convert premium, shipping and any resale royalty into a hammer figure first.
2. Increment alignment. Set the number on a published step so it is not lowered against you.
3. Round numbers avoided. 7,000 and 10,000 attract the same instinct in every other bidder.
4. Registration timing. Sotheby's asks clients to complete their account profile 24 hours before a sale to be eligible to bid.
5. Irrevocability. Christie's states that a bid cannot be cancelled once submitted.
6. Reserve awareness. Phillips sets the reserve as the confidential minimum agreed with the seller, capped at the low estimate.

When live participation is worth it: straight bidding vs proxy bidding in a contested room

Live participation earns its risk when the room carries information the platform cannot show. Christie's states that bidding in a live sale generally opens below the low estimate and advances in increments of up to 10% at the auctioneer's discretion, and Phillips confirms the auctioneer may place consecutive bids for the seller up to the reserve. Reading that sequence tells a bidder where the reserve sits, and a timed sale withholds it along with the audience. Where a house runs fully asynchronous sales, straight bidding vs proxy bidding has a single live answer: the maximum carries the whole strategy, as our comparison of a timed online sale against a live saleroom sets out.

FAQ: proxy maximums, ties and increments

Straight bidding vs proxy bidding: which method wins more lots?

Neither method wins more lots on its own, because the figure decides the outcome. A proxy instruction prevails whenever the underbidder's ceiling sits below yours, and it executes at the lowest step that clears them, per the Phillips Conditions of Sale. A straight bid prevails only while you watch the lot, and a timed sale runs for days.

Does an absentee maximum reveal my ceiling to the house?

Phillips describes written absentee bidding as a free and confidential service in its UK Auction Buyer's Guide, and its Conditions of Sale extend that to telephone and online bids. The instruction sits with the bids department and executes at the lowest possible hammer price given the reserve and the competing bids. Sotheby's holds a maximum the same way. Your ceiling becomes visible to the market only if the bidding reaches it.

What happens if two collectors leave the same maximum?

The earlier instruction prevails. Christie's states that where two or more bidders leave identical bids, the first bid received takes precedence, and Phillips executes the absentee bid received first in time. Christie's adds that in a live sale an absentee bid takes priority over the same amount bid in the room or on the telephone. Timing works as a tiebreak, which argues for registering early.

Can I raise my ceiling once the sale has opened?

Upward only. Christie's states that you can change your maximum bid amount while the current bid is lower than your maximum, and that a submitted bid cannot be cancelled. Phillips treats online bids as final and not amendable. A revision in the closing minutes reintroduces the arousal the standing instruction was set to exclude, so it deserves the arithmetic you gave the original.

How LLB Auction serves collectors who bid to a ceiling

LLB Auction runs fully asynchronous timed sales on its own platform over windows of seven to fourteen days, with four sales committed across 2026 and two in 2027, so a maximum holds for days rather than seconds.

Disclosed cost before the bid. The buyer's premium is 20% and the seller's commission 10%, published upfront, so a ceiling converts into total outlay without a checkout surprise.

Intake discipline. Roughly 40% of submissions are declined at intake, and every accepted lot carries provenance due diligence and a three-page condition report.

Documented results. The Contemporary Art Spring 2026 sale of 26 May 2026 offered 25 lots, of which 23 sold, for roughly 39,480 euros in gross hammer.

Registering before a window opens turns a considered number into an executable instruction. Browse the current LLB Auction sales and open an account.

Conclusion

Public auction sales rose 9% to 20.7 billion dollars in 2025 within a global art market of 59.6 billion, according to the Art Basel and UBS Global Art Market Report 2026 by Dr. Clare McAndrew of Arts Economics, while sales below 50,000 dollars fell 2% in both value and volume. Where most contemporary lots trade, competition is thinner and increments are wide, so the entry method changes the outcome as much as the figure. Straight bidding vs proxy bidding resolves on one question: which ceiling you intend to honour, the one set at the viewing or the one produced by the closing minutes.

Also worth reading:

• Bidding with a cool head: strategy and self-control in the saleroom
• The psychology that makes smart collectors overpay
• Setting your ceiling: what a work is worth to you
• Enchérir sans se laisser emporter : méthode et sang-froid

Sources:

• Register and bid : Christie's, 2026
• How can I bid in an auction? : Sotheby's, 2025
• Conditions of Sale : Phillips, 2026
• UK Auction Buyer's Guide : Phillips, 2026
• Auction fever and incidental arousal : Journal of Experimental Social Psychology, 2019
• A competitive arousal model of decision-making : Organizational Behavior and Human Decision Processes, 2005
• Global Art Market Report 2026 : Art Basel and UBS, 2026