What do you really pay at auction on top of the hammer price?

On top of the hammer price, an auction buyer pays a buyer's premium charged in tiers, sales tax or VAT on some or all of the invoice, an artist's resale royalty in the countries and on the works where one applies, and the costs of getting the lot home: shipping, insurance, storage, and interest or a surcharge if the payment is late or made by card. On a fee schedule of the kind used for the examples below, those additions come to between 28% and 36% of the hammer price, so a bid is never the amount you will be invoiced.

The hammer price is the last bid the auctioneer accepts. Every other line is set by two things: the conditions of sale of the house, which you accept when you register to bid, and the tax law of the place where the sale happens and where the lot is delivered. Both differ from one house and one country to the next, and the examples here say which assumption they rest on. The fee schedule used throughout is illustrative: it has the shape of a real schedule, and its rates belong to no house.

How is a tiered buyer's premium calculated?

A tiered buyer's premium is calculated like income tax: each rate applies only to the slice of the hammer price that falls inside its tier, and the slices are added up. The rate of the highest tier a lot reaches is never applied to the whole price.

The buyer's premium is the fee the house charges the buyer for running the sale, expressed as a percentage of the hammer price. Most large houses publish it as a schedule with two or three tiers, the rate falling as the price rises. The illustrative schedule used in this article is:

Take a lot hammered at $2,500,000. The first $1,000,000 carries 26%, which is $260,000. The remaining $1,500,000 sits in the second tier and carries 20%, which is $300,000. The premium is $560,000, or 22.4% of the hammer price, a rate that appears nowhere in the schedule.

Two mistakes are common. The first is to read the schedule as "a $2,500,000 lot is in the 20% tier, so the premium is 20%": that gives $500,000 and leaves the buyer $60,000 short. The second is to apply the headline rate of 26% to everything: that gives $650,000 and overstates the premium by $90,000, which is enough to make a bidder stop one or two increments early on a lot they could afford. On a $10,000,000 lot the first mistake is larger: 14% of the whole price is $1,400,000, while the real premium is $1,820,000, a gap of $420,000.

Schedules also differ by category inside the same house. Wine, cars, watches and online-only sales are often on their own rates, sometimes a single flat rate with no tiers. The schedule that binds you is the one printed in the conditions of the sale you are bidding in, on the date of that sale.

What does the total come to on three hammer prices?

On the illustrative schedule, with an 8% sales tax charged on hammer price plus premium, an $80,000 hammer price becomes a $108,864 invoice, a $2,500,000 hammer price becomes $3,304,800, and a $10,000,000 hammer price becomes $12,765,600. Shipping, insurance and any resale royalty come on top of those totals.

The 8% rate is an assumption chosen to keep the arithmetic readable, not the rate of any state or city. The tax line is computed on the sum of the hammer price and the premium, which is how the tax works in the United States example covered further down.

Read across the first row: the premium is 26% of $80,000, the taxable amount is $100,800, and 8% of that is $8,064. The buyer who bid $80,000 pays $28,864 more than the bid, which is 36.1% on top. On the $2,500,000 lot the additions are $804,800, or 32.2% on top. On the $10,000,000 lot they are $2,765,600, or 27.7% on top.

Notice what the tax does to the premium. Because the tax base includes the premium, each dollar of premium costs $1.08 in this example. A buyer who is exempt from the tax, or who takes delivery somewhere it is not charged, saves the tax on the premium as well as on the hammer price.

How does the premium's share change as the price rises?

The buyer's premium takes a smaller share of the hammer price as the price rises, because every dollar above a threshold is charged at a lower rate while the dollars below it keep their higher rate. On the illustrative schedule the share falls from 26.0% on an $80,000 lot to 22.4% at $2,500,000 and 18.2% at $10,000,000.

The share never drops to the bottom rate. However high the price goes, the first $6,000,000 has already been charged at 26% and 20%, so the blended rate approaches 14% without reaching it. The practical consequence is that the premium weighs most on the lots most people actually buy. Anything under the first threshold pays the full headline rate, and that is where a first-time bidder is most likely to be bidding.

A threshold is also not a cliff. Bidding $1,050,000 instead of $1,000,000 does not move the whole lot into a cheaper tier and does not make the premium jump: only the extra $50,000 is charged at 20%, adding $10,000 of premium.

How is sales tax or VAT applied to the hammer price and the premium?

Sales tax or VAT is applied according to the law of the place of sale and delivery, and the two main patterns are a tax on the hammer price plus the premium, and a tax that reaches the buyer only through the premium. Which one you face depends on the country, on the status of the lot and on your own status as a buyer.

In the United States, sales tax is a state and local matter, and rates and exemptions change from one state to the next. In New York, an advisory opinion of the New York State Department of Taxation and Finance states the rule plainly: the hammer price and any premiums charged to the purchaser are included in the receipt subject to sales tax. That is the pattern used in the table above. The usual ways a buyer falls outside the tax are also state rules: a dealer buying for resale who gives the house a valid resale certificate before paying, and a lot delivered by a carrier to a place where the tax does not apply or where a different tax applies instead. Collecting the lot in person generally fixes the tax at the place of collection, so the delivery decision is a tax decision and belongs before the sale, not after it.

In the United Kingdom, much of what is sold at auction goes through the auctioneers' margin scheme. Under HMRC's guidance on that scheme, the auctioneer accounts for VAT on its own margin, and the buyer's invoice shows the hammer price and the charges without any separate amount of VAT. The buyer experiences this as a premium that already contains VAT, and no VAT line on the hammer price. Where a lot cannot be sold under a margin scheme, the same guidance says VAT is due on the hammer price as well as on the house's services, which changes the total sharply. Catalogues flag these lots with a symbol explained in the conditions of sale.

Two more situations move the tax line. A lot that was brought into the country for the sale may carry import tax, charged to the buyer under the conditions of sale. And a lot that the house exports for you, with proof of export, may be relieved of the local tax, though it then meets the import duties and taxes of the country it arrives in. Neither is a saving until you have priced both ends.

What is artist's resale right and where does it apply?

Artist's resale right is a royalty paid to an artist, or to the artist's heirs, each time an original work of art is resold through the art trade, and it exists only in the countries whose law provides for it. It concerns works of art by living artists and artists who died recently enough to be within the term of protection, so it never touches a watch, a car or a case of wine.

The US Copyright Office has reported that more than seventy countries recognise the right, and that a federal resale royalty has never been adopted in the United States. In the European Union, the Resale Right Directive sets the framework: the royalty is payable by the seller, member states may make an art market professional liable alone or jointly, the minimum sale price a member state sets may not exceed €3,000, the rates taper from 4% on the first €50,000 down to 0.25% above €500,000, and the total may not exceed €12,500 on one sale. In Australia, the Office for the Arts describes a flat royalty of 5% of the sale price on eligible commercial resales of A$1,000 or more.

In the United Kingdom, the government's guidance states that the right applies when a work is resold through an auction house or art market professional for £1,000 or more, that it lasts for the artist's lifetime plus 70 years, and that the royalty is calculated on a cumulative scale:

The same guidance says the royalty is exempt from VAT and capped at £12,500 per sale, a cap the scale reaches at a sale price of £2,000,000.

Why does a royalty the law puts on the seller's side appear in an article about what the buyer pays? Because the conditions of sale can pass it on. The United Kingdom regulations make the seller and the seller's agent jointly liable, and say nothing that stops a house from recovering the amount by contract. Sotheby's published fee guidance, for one, lists a resale royalty among the amounts collected from the buyer in certain locations, calculated on the hammer price without the premium or VAT. Whether the house you are bidding with does the same is a line in its conditions, and lots that carry the royalty are marked in the catalogue.

Here is a United Kingdom example in pounds, with illustrative house rates. A painting by a living artist is hammered at £100,000. The premium is quoted as 25% plus VAT at 20% on the premium, and the house passes the resale royalty to the buyer. The premium is £25,000, the VAT on it is £5,000, and the royalty is 4% of the first £50,000 plus 3% of the next £50,000, which is £3,500. The buyer pays £133,500, of which £33,500, or 33.5% of the hammer price, is on top of the bid.

What other charges can appear on top of the invoice?

Beyond the premium, tax and any royalty, a buyer can expect shipping, transit insurance, storage after a free period, and a surcharge or a limit on card payments. None of these is a percentage of the hammer price fixed in advance, so each has to be quoted or read in the conditions before the sale.

Card payments deserve a closer look on a high-value lot. Many houses accept cards only up to a limit and some add a surcharge. On the $108,864 invoice from the table above, an illustrative surcharge of 3% would add $3,265.92, more than most shipping quotes for a small object. A bank wire avoids it, but it has to be sent in time.

Currency is the last hidden line. If the sale is in a currency other than the one you hold, the rate your bank applies on the day you pay belongs in the budget too, and the gap between sale day and payment day is an exchange risk you carry.

When is payment due, and what happens if you pay late?

Payment is due on the date fixed by the conditions of sale, usually counted in days from the auction, and a buyer who pays late owes what those conditions provide: typically interest, storage and, in the end, the house's right to cancel or resell at the buyer's cost. No general law sets a single deadline, so the number of days is something you read, not something you assume.

The fall of the hammer forms a binding contract. A winning bidder cannot think it over, renegotiate after a second look at the condition report, or walk away because the total was higher than expected. That is why the whole calculation has to be done before the paddle goes up.

Three points in the conditions decide what a delay costs you. The first is the interest clause: its rate, and whether interest runs from the due date or from the sale date. As an illustration, interest of 1% a month on the $108,864 invoice would add $2,177.28 after two months. The second is collection: ownership normally passes only when the house has received cleared funds in full, the lot is not released before then, and storage is charged once the free period ends whether or not you have paid. The third is default: conditions of sale usually reserve the right to cancel the sale, to resell the lot and claim any shortfall and costs from the first buyer, and to refuse that buyer's future bids.

Risk can pass before ownership does. Many conditions put the lot at the buyer's risk from a set number of days after the sale, paid or not. Your own insurance should start on the date the conditions name, which can be earlier than the day the lot leaves the building.

How do you set your maximum bid from a total budget?

To set a maximum bid from a total budget, take the budget, remove the fixed costs, divide by one plus the tax rate, then reverse the premium using the formula for the tier your bid will fall in. The result is the highest hammer price you can afford; your maximum bid is the bidding increment at or just below it.

Write B for the all-in budget, F for the fixed costs you have quotes for (shipping, insurance), and t for the tax rate on hammer price plus premium. The amount left for hammer price and premium together is N = (B − F) ÷ (1 + t). On the illustrative schedule, the highest hammer price H is then:

The two limits are the thresholds with their premium added: $1,000,000 plus $260,000, and $6,000,000 plus $1,260,000. The $60,000 and $420,000 are the same amounts by which the "top rate on everything" mistake fell short earlier. For any other schedule, rebuild the three rows with that schedule's own rates and thresholds.

A larger budget crosses a threshold. With $3,000,000 all-in, N is $3,000,000 ÷ 1.08 = $2,777,777.78, which falls in the second row. The highest hammer price is ($2,777,777.78 − $60,000) ÷ 1.20 = $2,264,814.81. At a bid of $2,250,000 the premium is $260,000 plus 20% of $1,250,000, so $510,000; the tax on $2,760,000 is $220,800; the total is $2,980,800.

Fixed costs shift the answer less than people fear, but they can cost one increment. Put a $6,000 shipping and insurance quote into the $500,000 example and the highest hammer price falls from $367,430.92 to $363,021.75. The maximum bid stays at $360,000, and the total with shipping is $495,888.

Bidding increments are set by the auctioneer and widen as the price rises, so check the increment table in the conditions and write your limit as a number that can actually be called. A limit that sits between two increments is really the lower one.

What should you check in the conditions of sale before you bid?

Before bidding, check eight things in the conditions of sale and the catalogue entry: the premium schedule for that sale, the tax status of the lot, any resale royalty, the payment deadline and methods, the interest and storage terms, the date risk passes, the shipping options and any export restriction. Each one changes the total or the date by which you must have the money.

1. Premium schedule. The rates and thresholds for this sale and this category, and whether the rates are quoted with or without VAT.
2. Tax symbols on the lot. A symbol next to the lot number can mean tax on the full hammer price, import tax, or a margin-scheme sale. The key is in the conditions.
3. Resale royalty. Whether the lot is marked as carrying one, and whether the house charges it to the buyer.
4. Payment deadline. The number of days, and whether they are calendar days or business days.
5. Payment methods. Card limits and surcharges, and whether the house accepts payment from anyone other than the registered buyer. Many refuse third-party payments.
6. Interest and storage. The rates, and the day each one starts.
7. Risk. The day the lot becomes your responsibility, so your insurer can be told in advance.
8. Shipping and export. A written quote, and whether the lot needs a licence or contains regulated materials that could delay or block its departure.

If any of these is unclear, the house's client service or bids department answers such questions every day, in writing if you ask. An answer before the sale costs nothing; the same question after the hammer has fallen cannot change what you owe.

How should an advisor or dealer state the cost to a client?

An advisor or dealer bidding for a client should agree the limit in writing as an all-in figure and as the hammer price it converts to, and should settle before the sale who is registered as the buyer. A limit expressed only as "up to $500,000" is ambiguous by $132,570: it is the difference between a $500,000 hammer price and the $367,430 hammer price that a $500,000 total allows in the worked example.

The registered bidder is the party the house invoices and holds to the contract. An advisor who registers in their own name and bids for an undisclosed client is, as far as the house is concerned, the buyer, and owes the full invoice if the client hesitates. Houses will generally register the client directly and take the advisor as an authorised representative if the paperwork is done ahead of the sale, which also matters for tax: the resale certificate, the VAT status and the delivery address that decide the tax line are those of the buyer of record.

A short written instruction covers it. It names the lot, the all-in budget and what the budget includes, the maximum hammer price worked out from it, who is registered, who pays the house and from which account, where the lot is delivered, and the advisor's own fee and its base. That last point is worth a sentence of its own: a fee of 5% of the hammer price and a fee of 5% of the total invoice are different amounts, $18,000 against $24,494.40 on the $360,000 bid above, and the engagement letter should say which one it is.

The same sheet serves a collector bidding alone. The number to carry into the room is the maximum hammer price, written down before the sale and worked out backwards from the money you are prepared to spend in total.