What Is a Buyer's Premium at an Auction?

The premium is applied to your winning bid according to the auction's terms. Two examples show the basic mechanics — the percentages here are used solely to demonstrate the math, not to suggest what any auction actually charges.

Neither 10% nor 15% should be treated as normal, common or typical. Real premiums vary widely and may be higher or lower depending on the auction.

The calculation follows a simple two-step pattern:

A few hypothetical calculations:

A buyer's premium can be part of how an auction company or platform generates revenue and covers the costs of conducting an auction. It is one of several possible fee structures an auction may use.

It's worth understanding that seller commissions and buyer's premiums are separate concepts. A seller's commission is a fee the seller may pay the auction company under their agreement; a buyer's premium is a charge assessed to the buyer under the auction terms. We don't speculate about the finances of particular auction houses, and fee structures vary.

There is no universal buyer's-premium percentage.

The amount depends on the specific auction, auction house, platform, category and terms. Some auctions may not charge one at all. Others may use:

• A percentage of the winning bid
• Tiered percentages that change at certain thresholds
• Different rates depending on bidding method
• Other fee structures set by the auction

The buyer's premium may appear in several places, depending on the auction:

• Auction terms and conditions
• Lot details
• Registration information
• The bidding interface
• A published fee schedule
• The auction information page

Locate it before placing a bid, not after you've won.

No. They are separate concepts applied to different parties.

Buyer's premium

A charge assessed to the buyer under the auction's terms, added to the winning bid.

Seller's commission

A fee or commission that may be charged to the seller under their agreement with the auction company.

Seller arrangements vary and generally do not determine what the buyer owes unless specifically reflected in the auction terms that apply to the buyer.

Tax treatment varies by jurisdiction, transaction and circumstances. We don't provide state-by-state tax advice, and we don't claim universally whether the premium itself is taxable.

The amount displayed at checkout may include applicable taxes. Review the auction's terms and the applicable requirements for your situation, and don't assume the subtotal you calculated is the final amount you'll be charged.

Depending on the auction, additional costs may include:

• Taxes
• Shipping
• Handling
• Transportation
• Storage
• Documentation
• Payment-related charges
• Other auction-specific fees

Not every auction charges these. Review the actual terms rather than assuming which charges apply to a given sale.

The table below shows how a premium turns a winning bid into a subtotal. It works on mobile without scrolling sideways.

These percentages are hypothetical examples used only to demonstrate how the calculation works. They do not represent standard or recommended auction fees.

A bidder who thinks "my budget is $1,000, so I can bid $1,000" can easily exceed their intended budget once the premium and other costs are added on top. The premium changes what your bid actually costs you.

The fix is to determine the maximum bid based on the maximum total cost you're willing to accept:

Say your maximum total budget is $1,000. Before you decide what to bid, you'd consider the buyer's premium, applicable taxes, shipping or transportation, and any other known costs — then subtract those from $1,000 to find the bid ceiling you're actually willing to reach.

When a buyer's premium is part of the auction's terms, a bidder generally cannot simply opt out of it. However, fee structures vary among auctions — some don't charge one at all.

The practical choice is to compare the total cost and decide whether the auction still makes sense for you before bidding. We don't suggest fee-avoidance schemes; the reliable approach is to know the terms and budget around them.

Three terms often get blurred together. They aren't the same thing:

Winning bid / hammer price

The amount at which the lot is sold under the applicable auction process.

Buyer's premium

An additional charge assessed according to the auction terms, on top of the winning bid.

Total purchase cost

May include the winning bid, buyer's premium, applicable taxes, shipping and other charges.

Terminology and procedures can vary between online and traditional auctions, so read the specific auction's terms to see how it uses these terms.

Run through this checklist before bidding:

• I found the buyer's premium
• I understand how it is calculated
• I checked for other auction fees
• I considered applicable taxes
• I know the shipping / pickup costs or requirements
• I calculated my approximate total cost
• I established my maximum bid

These guides cover the other terms you'll meet alongside a buyer's premium:

Buyer's premiums may appear in auctions involving estate items, jewelry, antiques and collectibles, vehicles, real estate, equipment and other categories. That doesn't mean every auction in these categories charges one — it means the premium is common enough across categories that it's worth checking the terms wherever you bid.