What Is a Buyer's Premium?

Why Auctions Charge a Buyer's Premium

An auction house sits between two parties: the consignor who owns the coins and the bidder who wants them. The consignor usually pays a seller's commission out of the hammer price. The buyer's premium is the bidder's share of what it costs to put on the sale: cataloging and photography, the bidding platform and webcast, card processing, insurance, secure storage, and the people who answer the phone when you call about a lot. Splitting those costs across both sides lets a house keep seller commissions lower, which attracts better consignments, which puts better coins in front of you. The certified pieces that anchor our rare coin auctions reach the catalog because that machinery gets funded.

The fee is old in spirit but modern in form. It dates to September 1975, when Christie's and Sotheby's introduced a 10 percent charge at their London salerooms, according to the Wikipedia entry on the buyer's premium. Rates climbed from there, other houses followed, and premium-free auctioneers became scarce. Today the premium is a standard part of buying at auction, in coins and everywhere else. Treat it the way you treat sales tax at a store: not a trick, just part of the price.

Typical Buyer's Premium Ranges

Across art and collectibles broadly, premiums commonly run from 10 to 30 percent of the hammer price, with the fine-art giants at the high end. Numismatics sits in a narrower band. A Coin World survey of buyer's fees found major coin houses charging 15 to 17.5 percent, online coin platforms as low as 10, and some firms since moving to 20. So at many houses you can expect something between 10 and 20 percent on a coin lot, often with a minimum per-lot fee, and sometimes with tiered rates that drop once an invoice passes a threshold. Some houses also charge a lower rate for payment by check or wire than by card.

You will notice we have not printed our own number here. That is deliberate. Each sale we run publishes its complete terms, the buyer's premium included, on its catalog page, and those terms govern that sale. Read them before you bid. That habit protects you everywhere, not just with us: premiums differ from house to house and can change between sales, and the terms page is the only figure that counts when the invoice is written. Thirty seconds of reading beats any general range you find on the internet, this page included.

The Arithmetic: Hammer Price vs. Your Real Price

The hammer price is the number the auctioneer calls before saying sold. It is what the bidding decided, and it is not what you pay. Your invoice adds the buyer's premium on top, then shipping and any applicable tax. Here is a worked illustration. The 15 percent rate below is a sample chosen for round numbers, not our rate; the terms on each sale's catalog page state the real one.

• Hammer price: $1,000
• Buyer's premium at 15 percent (illustration only): $150
• Invoice before shipping and any tax: $1,150

The forward math is one multiplication: hammer times 1.15 at that sample rate. The backward math matters more. If your all-in budget for a coin is $1,000, your top bid is not $1,000. Divide the budget by 1.15 and you get about $869, so $850 is a sensible ceiling at that rate. Bidders who skip this step routinely pay 10 to 20 percent more than they planned, one lot at a time. And because every lot in our weekly sales typically opens at $5, the same arithmetic applies whether you are chasing a $40 Morgan dollar or a four-figure gold piece. Small lots are cheap practice for the habit.

One more wrinkle: bid increments. Auction platforms move bidding in set steps, so your ceiling should land on a real increment rather than between two of them. If the math says your top hammer bid is $869 and the lot is moving in $25 steps, your practical ceiling is $850. Round down, never up. Rounding up feels harmless on one lot and quietly adds a premium on top of the premium across a full session of winning bids.

How Smart Bidders Budget for the Premium

Start from the all-in number, always. Decide what the coin is worth to you delivered, subtract shipping, then divide by one plus the premium rate from the sale's terms. The result is your maximum hammer bid. Write it down before the session starts and let it stand; auction pace is built to make you forget your own arithmetic. Our how to bid guide walks through setting maximum bids on HiBid so the platform holds that line for you even when you are not watching.

Use past prices carefully. On our closed HiBid catalogs, the price realized shown for each lot is the winning bid; the premium is added on the invoice. Other houses publish all-in figures, so when you study auction results anywhere, confirm what a figure includes before you lean on it. The same all-in habit makes dealer comparisons honest: a coin that hammers at $950 can cost you more than the same coin on a dealer's site at a $1,050 fixed price once the premium lands. Sometimes the auction still wins, sometimes it does not, and only the all-in number tells you which. Our weekly coin auctions give you a fresh catalog every week to practice the discipline on, and the rest of the Learning Center covers grading, certification, and the other half of pricing a coin well. Bid with the premium priced in and the fee fades into the background, where it belongs.

Buyer's Premium Questions