How a Timed Online Art Auction Actually Runs, Start to Settlement

How do online art auctions work when you strip away the saleroom theatre and follow a single contemporary lot from preview to delivery? In a timed online auction, a sale opens for a fixed window of several days, each work carries a published estimate, and the highest bid above the seller's confidential minimum wins when the clock runs out. There is no auctioneer calling the room and no live gavel. This guide maps every stage a collector passes through: how a catalogue is built, how a sale opens and closes, how to register and bid, what the buyer's premium adds to the hammer, and what happens between the winning bid and the crate arriving at your door.

Key takeaways:

• In a timed online sale, the lot with the highest bid above its reserve wins at the published closing time, with a soft close extending the deadline if late bids arrive.
• The buyer's premium is added to the hammer price: 27% on the first tier at Sotheby's and Christie's in 2025, against a flat 20% at LLB Auction.
• Under the EU Fifth Anti-Money Laundering Directive, in force since January 2020, any art transaction of 10,000 euros or more triggers mandatory identity checks.
• Original works of art enter the EU free of customs duty, and France applies a reduced import VAT of 5.5% as of July 2025.
• The contemporary market is rotating toward accessible price points: lots under 50,000 dollars rose 20% in 2024, according to the Hiscox Artist Top 100 report.

The contemporary online market rewards collectors who understand the mechanics. Total auction value for post-2000 artworks fell 27% to 698 million dollars in 2024, from 956 million dollars in 2023, according to the 2025 Hiscox Artist Top 100 report produced with ArtTactic, yet the number of works sold rose 5% over the same period. Buyers are still active; they are simply concentrating on lots they can assess with confidence. Robert Read, Head of Art and Private Client at Hiscox, frames the shift directly: "The art market is clearly evolving, with collectors now gravitating towards lower-value pieces and established artists." Knowing how a sale actually runs is the difference between a disciplined acquisition and an expensive guess.

The Catalogue: How Lots Are Numbered and Estimates Are Built

How do online art auctions work behind the scenes, before any bid is placed? Every timed sale begins as a catalogue, and every object in it is a lot: a single work or a grouped set offered as one round of bidding. Each lot receives a lot number, the identifier that fixes its place in the running order and its address throughout invoicing and shipping. The catalogue entry carries the artist's name, the medium and dimensions, the year of creation, the provenance (the documented chain of previous ownership), exhibition history, and a link to the condition report, the specialist's written account of the work's physical state.

The estimate is the published price range, expressed as a low and a high figure, that signals where the specialist expects bidding to land. The high estimate usually sits around 50% above the low, according to Invaluable's auction glossary, and the range is built from recent results for comparable works by the same artist. The estimate is a negotiated market signal, not an appraisal of intrinsic worth. Sitting beneath it, invisible to bidders, is the reserve: the confidential minimum the consignor will accept, agreed with the house and never published. A lot that fails to reach its reserve goes unsold.

Reading a catalogue entry well is the first skill a collector builds. The table below breaks down what each element tells a bidder and who sets it, the kind of compact reference an answer engine can quote verbatim.

MyArtBroker's guide to how the art auction process works puts the point bluntly for buyers: never bid without a detailed condition report that lists specific issues rather than vague reassurance. For a deeper walk through each stage a work passes, see our guide on the journey from catalogue to crate.

Provenance, Condition and Attribution Before You Bid

The single largest worry an experienced collector brings to an online sale is authenticity, and it shapes how do online art auctions work at the level of trust: the catalogue answers the question through documentation rather than promises. Provenance is the recorded chain of ownership from the artist or first sale to the present consignor, and an unbroken chain is the strongest support an attribution can have. Gaps are not automatically disqualifying, but they shift the burden onto certificates, catalogue raisonné references and exhibition records, all of which a specialist should be able to produce on request.

The condition report is the second pillar, and at a serious house it is a written, often multi-page account: a three-page report is standard at LLB Auction. It records restoration, surface wear, framing, and any structural issue, in language precise enough to bid against. The principle that governs the whole process is liability: a responsible house documents evidence and lets the report stand as the record, while the buyer assumes authenticity risk under the conditions of sale. No reputable house guarantees a work is authentic or describes its condition as better than the report states. For a contemporary collector, that candour is the protection: a thorough report and a clean provenance let you assess a work as a specialist would, then bid with the risk understood rather than hidden.

How Do Online Art Auctions Work, From Open to Soft Close

How do online art auctions work once the catalogue is live? The sale opens on a published date and stays open for a defined window, typically 7 to 14 days for a contemporary timed sale. During that window you can place a bid on any lot at any hour. The platform displays the current leading bid and the next acceptable increment, and your bid must meet that increment to register. Unlike a live auction, nothing is decided in a single afternoon; the contest unfolds asynchronously across days.

The decisive mechanic is the close. A naive deadline would reward sniping, the practice of placing a winning bid in the final second so rivals have no time to respond. Timed platforms defeat this with a soft close, also called anti-sniping or dynamic closing: when a bid lands inside the final window before a lot is due to end, the closing time extends by a set interval, commonly 2 to 5 minutes. If a fresh bid arrives during that extension, the clock resets again, and the cycle repeats until a full interval passes with no new bid.

The practical effect is that a lot closes only when bidding genuinely stops, not when a stopwatch hits zero. A lot scheduled to end at 19:00 can run to 19:20 if competition is fierce in the closing minutes. Planning around this matters: a collector who sets a firm maximum in advance is unaffected, while one who hopes to snatch a lot at the buzzer will simply trigger extensions and bid against more time, not less.

A minute-by-minute approach makes the soft close work for you rather than against you. Be present in the final 20 minutes of any lot you want, because that is when a multi-day sale compresses into its real contest. Watch the extension interval, usually 2 to 5 minutes, and treat each reset as confirmation that a rival is still committed, not as a cue to panic. If your proxy maximum already covers your true ceiling, you can let the engine defend your position through every extension without touching the keyboard. The collectors who lose in the closing minutes are those who entered a soft ceiling and then raise it reactively, bidding the work past the number they set in calmer judgement an hour earlier. Our explainer on what the soft close does to a sale traces the dynamic in detail, and the broader question of timed online sale or live saleroom sets out which format serves a collector better.

Registering to Bid: Identity Checks and Eligibility

How do online art auctions work to keep a sale clean and enforceable? They begin by confirming exactly who is bidding. Before a single bid is possible you must register, and registration is where compliance bites. To bid at Sotheby's, the house instructs buyers to complete their account profile at least 24 hours before the sale and issues a unique paddle number for each auction. Online-only sales streamline the step, but the identity requirement does not disappear. The house must know who is bidding before it will let a bid stand.

The reason is regulatory. Under the EU Fifth Anti-Money Laundering Directive (5AMLD), in force across the Union and the United Kingdom since January 2020, art market participants who handle payments of 10,000 euros or more must perform customer due diligence: verifying a client's identity from official documents, confirming proof of address, and understanding the source of funds. Norton Rose Fulbright and identity specialist iDenfy both document how auction houses now run know-your-customer checks as standard intake before activating a bidding account. For a contemporary collector spending 50,000 to 500,000 euros a year, these thresholds are crossed on almost every serious lot.

Eligibility can also be conditional. A house may set a deposit, request a bank reference, or cap a first-time bidder's limit until a payment history exists. None of this is designed to slow a genuine buyer; it exists to keep the saleroom clean and the settlement enforceable. Building the paperwork once, ahead of a sale you care about, removes the friction. Our fiche on registering to bid and the identity checks that slow you down covers the documents to prepare and the limits that can apply.

Placing a Bid: Increments, Maximum Bids and Proxy Bidding

How do online art auctions work at the moment you commit? Through two simple mechanisms: fixed increments and a proxy engine. Bidding follows a system of fixed increments, the predefined steps that determine the next acceptable bid. Increments rise with price: a lot under 1,000 euros might advance in steps of 50, then 100 and 500 as it climbs, then thousands at the top. Houses publish their increment table in the conditions of sale, and reading it before you bid removes any surprise about where your next click lands.

The instrument that most rewards discipline is the maximum bid, also called a proxy bid or absentee bid. The three terms describe one tool: an instruction to the house or platform to bid up to a secret ceiling on your behalf, at minimum increments, so you pay the lowest price that still wins. The labels differ by context, an absentee bid is the traditional term for leaving your ceiling with the house before a live sale, while maximum and proxy bid are the online-native names, but the mechanism is identical. You enter the highest figure you are willing to pay, and the platform bids on your behalf in minimum increments, advancing only as far as it must to keep you in front, up to your ceiling. Sotheby's describes the mechanism directly: the platform places incremental bids automatically up to your maximum amount. You do not need to watch the screen, and you never reveal your ceiling to rivals. Knowing how to set a maximum bid in an online auction is the single habit that separates collectors who buy well from those who chase a number upward in the closing minutes.

The figure you enter should already absorb the costs the hammer excludes. Five checks belong in that calculation:

1. Anchor on comparables. Set your walk-away figure from recent results for similar works, not from the round number that feels comfortable.
2. Add the buyer's premium. A 5,000 euro hammer at a 20% premium is a 6,000 euro commitment before tax and transport.
3. Account for VAT and import duty. A cross-border purchase can add a reduced import VAT, which in France is 5.5% as of July 2025.
4. Budget insured shipping. Crating, transit and insurance for a mid-value contemporary work routinely run into the hundreds of euros.
5. Set the ceiling, then stop. Enter the maximum once and let the proxy engine work; do not raise it because a rival pushed past you.

Phillips illustrates how the format itself can reward early discipline. In September 2025 the house introduced Priority Bidding, a written binding bid placed at least 48 hours before the sale at or above the low estimate, which earns a lower buyer's premium than bids entered later. The lesson generalises beyond one house: in a timed sale, the collector who decides early and commits in writing is structurally advantaged over the one who waits.

Buyer's Premium and What the Hammer Price Excludes

How do online art auctions work out the price you actually pay? The hammer is only the starting figure. The hammer price is the winning bid, the figure at which competition stops. It is not the figure you pay. On top of the hammer sits the buyer's premium, a percentage the winning bidder owes the house in addition to the hammer, and it is the cost first-time bidders most often underestimate. As Christie's auction glossary sets out, the premium is added to the hammer to form the invoice total, and the major houses now apply it in tiers that fall as the hammer rises.

In 2025 the headline houses converged on aggressive premiums at the lower end, exactly where most contemporary lots trade. Christie's charges 27% on the portion of the hammer up to 1.5 million dollars or 1 million pounds, 22% to 8 million, and 15% above, according to reporting in The Art Newspaper. Sotheby's mirrors the structure at 27% to 1 million dollars. Phillips applies 27% on the first million in its online-only New York sales. A boutique house can compete directly on this number: LLB Auction charges a flat 20% buyer's premium, disclosed upfront with no checkout surprises.

The premium is rarely the only addition. Sales tax or VAT can apply to the premium and sometimes the hammer, depending on where the work and the buyer sit, and a cross-border purchase brings import charges. The discipline is to treat the published estimate as the floor of your real cost, not the ceiling. A collector who reads the conditions of sale, including those Phillips publishes for each auction, knows the full arithmetic before bidding rather than at checkout. The detail of invoicing, VAT and the journey home after the hammer is worth reading before your first serious bid.

After the Hammer: Invoicing, Payment, VAT and Customs

How do online art auctions work once the bidding stops and you have won? Settlement takes over. Winning is the start of settlement, the post-sale process that moves a lot from the saleroom to your ownership. Within a day or two the house issues an invoice combining the hammer, the buyer's premium, any applicable tax, and agreed charges. Payment must clear before the work is released; as MyArtBroker notes, title and possession transfer only once funds settle, and free storage is typically capped, often around two weeks, before daily fees begin to accrue.

Payment terms reward preparation. Most houses ask for settlement within five to seven business days and accept bank transfer for higher values, with cards often capped below the level of a serious contemporary lot. A first purchase can take longer to clear while the house confirms the source of funds, the same due-diligence step that gated your registration, so a buyer who lines up the transfer in advance shortens the gap between hammer and collection. Late payment is not cost-free: beyond storage charges, the conditions of sale typically reserve the house's right to charge interest or cancel the sale, which is why reading those terms before bidding, not after winning, is the mark of an experienced collector.

Tax and customs are where international buyers meet real complexity. Original works of art are generally exempt from customs duty when imported into the EU, regardless of origin, but import VAT still applies on the value entering the Union. France levies a reduced import VAT of 5.5% as of July 2025, among the lowest rates in Europe, while Belgium and the Netherlands sit at 6% and 9%. A further change matters for the trade: since January 2025, EU Directive 2022/542 has restricted combining a reduced import VAT rate with the resale margin scheme, so works now move with VAT applied on the full price rather than the dealer's margin alone, as Barnebys and art-logistics specialist Convelio both document.

A short worked example makes the arithmetic concrete. Take a contemporary work that hammers at 5,000 euros at a house charging a 20% premium:

• Hammer price: 5,000 euros.
• Buyer's premium at 20%: 1,000 euros, for an invoice subtotal of 6,000 euros.
• French import VAT at 5.5% on a 6,000 euro customs value: about 330 euros, where the work is imported into France from outside the EU.
• Insured shipping and crating: several hundred euros depending on size and distance.

The all-in cost lands near 6,500 euros, roughly 30% above the hammer, and VAT treatment must be verified lot by lot because the rules turn on where the work sits and whether the buyer is a business or a private collector. The figures here are illustrative, not a tax opinion. What they prove is the principle: the hammer is a down payment on the real number.

Coordinated Worldwide Shipping and Insured Transit

How do online art auctions work to get a fragile object safely to your door? Through coordinated, insured transit. Once the invoice settles, the work has to travel, and contemporary art is fragile freight. A reputable house coordinates packing, transit and insurance rather than leaving a buyer to arrange it cold. Crating is built to the object: a stretched canvas, a work on paper under glass, and a cast sculpture each demand different protection, and a specialist packer matches the method to the medium.

Insured transit is the part collectors most often overlook. Cover should run door to door and reflect the full purchase value, not the hammer alone, so that a loss in transit is made whole at what you actually paid. For cross-border shipments the house, or its logistics partner, prepares the customs paperwork that clears the work into its destination country, the same documentation that determines the import VAT discussed above. Some houses absorb shipping on selected sales; LLB Auction offers free coordinated worldwide shipping on some of its sales, which removes a variable cost from the buyer's calculation. The practical rule is simple: confirm who arranges transit, who insures it and to what value, and who files the customs entry, before the lot leaves the building.

The People Behind the Sale: Specialist, Consignor, Auctioneer and Registrar

How do online art auctions work as a coordinated effort rather than a single performance? Four roles carry a lot from intake to settlement, and knowing who does what tells a collector whom to ask. The consignor is the seller, the collector, gallery or estate that places a work into the sale and agrees the reserve. The specialist is the house expert who sources the consignment, researches provenance, writes the catalogue entry and sets the estimate with the consignor; the specialist is, in practice, the person who assembles the sale. As Artsy documents, the negotiation over an estimate happens precisely between specialist and consignor, the specialist often pressing for the lowest workable figure to encourage competitive bidding.

The auctioneer is the figure most associated with auctions, yet in a pure timed online sale there is no live caller at all; the platform itself executes the close, and the auctioneer's judgement is replaced by the soft-close algorithm. The registrar is the quieter custodian who tracks each lot by its number, manages condition records, oversees storage and release, and ensures the right work reaches the right buyer after payment. In an online house the registrar's discipline is what makes settlement reliable. For a full account of each role, read the people behind every lot and what each one decides.

What Happens to Unsold and Bought-In Lots

How do online art auctions work when no bid is high enough? The lot does not sell, and the language of failure is worth knowing. A work that does not reach its reserve is bought in, marked BI in the house's records, and returned to the consignor. The term carries weight: as MyArtBroker observes, a bought-in or burnt lot can damage a work's resale prospects, because the market reads a public failure to sell as a verdict on price or desirability.

Several paths follow a bought-in lot. The house may run a post-sale private treaty, inviting underbidders to meet the reserve in the days after closing; the consignor may relist the work in a later sale, sometimes with a revised reserve; or the work may simply return home unsold. A consignor still typically owes agreed fees on an unsuccessful sale, which is why setting a realistic reserve, neither so high it deters bidding nor so low it gives the work away, is one of the specialist's most consequential decisions. For buyers, an unsold lot is occasionally an opening: a disciplined offer after the sale can secure a work the room declined at a more confident figure.

How LLB Auction Runs a Timed Sale for Collectors

LLB Auction is an independent contemporary art auction house running its own timed online platform, built around a single conviction: the curation is the product. The house addresses the experienced collector as an equal who wants the mechanics, the money and the due diligence laid out plainly. Three commitments define how a sale runs.

Curated intake. The house rejects roughly 40% of submissions before a work ever reaches a catalogue, concentrating each sale on objects a collector can assess with confidence. Typical lots run from 800 to 50,000 euros, with occasional works above 100,000 euros, across modern and contemporary names.

Documented due diligence. Every lot carries per-lot research into provenance and ownership history and a published three-page condition report. The house documents evidence and lets the condition report stand as the record; the buyer assumes authenticity risk under the conditions of sale, as at any auction house, which is precisely why the documentation is thorough rather than promotional.

Transparent settlement. Fees are disclosed upfront: a flat 20% buyer's premium and a 10% seller's commission, with no hidden charges and free coordinated worldwide shipping on some sales. The Contemporary Art Spring 2026 sale, which closed on 26 May 2026, offered 25 lots and sold 23, for roughly 39,480 euros in gross hammer, documented in the house's own records and on Artsy.

With four sales committed across 2026, the calendar is built for collectors who plan. To receive each catalogue and sale preview before bidding opens, register for the LLB Auction newsletter and follow the timed sales as they go live.

FAQ: How Do Online Art Auctions Work

How do online art auctions work for a first-time bidder?

You register and pass identity checks, browse the catalogue and read each condition report, then place a maximum bid on the lots you want. The platform bids for you up to your ceiling in set increments. When the sale closes, the highest bid above the reserve wins, and you pay the hammer plus the buyer's premium and any tax. A soft close extends a lot's deadline if bids arrive late, so there is no advantage in waiting for the final second.

What is the difference between the hammer price and what I pay?

The hammer price is the winning bid. Your invoice adds the buyer's premium, a percentage charged by the house, plus any applicable VAT or sales tax and agreed shipping. At a 20% premium, a 5,000 euro hammer becomes a 6,000 euro subtotal before tax and transport. Always treat the estimate as the base of your real cost rather than the total.

How do I set a maximum bid in an online auction?

Enter the highest figure you are prepared to pay, including the premium and any tax. The platform places proxy bids on your behalf, advancing only as far as needed to keep you in front, up to that ceiling, without revealing it to rivals. Set the figure from comparable results, then leave it; the discipline of not raising your maximum in the closing minutes is what protects you from overpaying.

What happens if a lot does not sell?

A lot that fails to meet its confidential reserve is bought in, marked BI, and returned to the consignor. The house may then arrange a private sale with an interested underbidder, the consignor may relist it in a later sale, or it returns home. A bought-in result can soften a work's later prospects, since the market notes a public failure to sell.

Do I have to pay VAT and customs when buying art online?

Often, yes, and it depends on where the work and you are located. Original art enters the EU free of customs duty, but import VAT applies; France charges a reduced 5.5% as of July 2025. Since January 2025, EU rules restrict combining a reduced import rate with the resale margin scheme. Confirm the VAT treatment for each lot before bidding.

Is buying contemporary art at auction a good investment?

Art should not be treated as a financial asset, and no reputable house will promise that a work will appreciate. Returns are uncertain: average resale returns across the contemporary top 100 turned slightly negative in 2024, according to the Hiscox Artist Top 100 report. Buy work you want to live with, verify provenance and condition, and treat any future resale value as a possibility rather than a plan.

Conclusion

How do online art auctions work, reduced to a single sentence? A timed sale opens for days, each lot carries an estimate and a hidden reserve, you bid by proxy up to a maximum you set in advance, a soft close ensures the contest ends only when bidding truly stops, and settlement adds the buyer's premium, tax and insured shipping to the hammer before the work reaches you. Master that sequence and the format stops being opaque. The collector who understands how do online art auctions work approaches a sale the way a specialist does: reading the catalogue closely, costing the full purchase before bidding, and committing to a disciplined ceiling rather than a hopeful one. The mechanics are knowable, the costs are predictable, and a sale run with transparency rewards the bidder who did the work.

À lire également :

• From catalogue to crate: the stages a lot passes through
• The people behind every lot and what each one decides
• Registering to bid: identity checks, limits and what slows you down
• What the soft close does to a sale, and why sniping fails
• After the hammer: invoicing, VAT, customs and the insured journey home
• Timed online sale or live saleroom: which format serves a collector better

Sources :

• Hiscox Artist Top 100 2025, key takeaways : ArtTactic, 2025
• Affordable art prevails, Hiscox press release : Hiscox, 2025
• How the art auction process actually works : MyArtBroker
• Guide for buyers : Sotheby's
• Buying at Christie's, glossary of terms : Christie's
• Conditions of sale and buyer's guide : Phillips
• The complete glossary of auction terms : Invaluable
• Sotheby's adjusts buyer's premiums and fee structures : The Art Newspaper, 2026
• Art transport and VAT guide : Convelio, 2025
• What art buyers need to know about VAT : Barnebys, 2025
• Money laundering controls in the art market : Norton Rose Fulbright