What deposits, admin fees and buyer's premiums really cost on auction day

The winning bid isn't what you pay on the day. When the hammer falls you owe the deposit and the auctioneer's fees immediately, with the balance and the tax following on a fixed timetable, and the fee structures differ enough between auction houses to change which lot is actually the cheaper buy.

The deposit

The standard deposit is 10% of the purchase price, paid at the fall of the gavel. Many auctioneers set a minimum: Bond Wolfe's buyer FAQs require 10% or £5,000, whichever is greater, and for a lot selling below that threshold, the full purchase price plus the administration fee is payable on the day instead. Fail to complete later and the deposit is forfeit, so this is money you should never bid without holding in cleared funds.

Administration fees

Auctioneers charge the buyer an administration fee on top of the price. Auction House's fee explainer describes the standard model: a fixed fee or a percentage of the sale price subject to a minimum, payable with the deposit when the gavel falls. Bond Wolfe charges a flat £2,700 including VAT per lot.

Flat fees bite hardest on cheap lots. That £2,700 is 1.7% of a £160,000 purchase but 4.5% of a £60,000 one, which is worth remembering when a bargain-basement lot looks cheap against its neighbours.

Buyer's premiums

Some auction houses also charge a buyer's premium, a separate percentage of the sale price, on top of any administration fee. The listing page for each lot states which fees apply, and the special conditions in the legal pack can add more: seller's legal fees, search costs and arrears are all regularly passed to the buyer by contract. Two identical £100,000 lots at different auction houses can differ by several thousand pounds once the fee pages are read side by side.

The same fees apply before and after the room

Fees don't disappear if you dodge the auction itself. Bond Wolfe's guidance is explicit that an accepted pre-auction offer proceeds on the usual auction terms, with the contract signed and the 10% deposit and administration fee paid before auction day. Unsold lots are often marketed for a couple of weeks after the sale, and offers on those are taken under auction conditions too, so the fee arithmetic follows the property, not the room.

Stamp duty on the standard timetable

Auction purchases pay Stamp Duty Land Tax like any other purchase in England and Northern Ireland, with the return due within 14 days of completion, and completion itself usually 28 days after the auction. Tax depends on your circumstances, and this is general information rather than advice.

A worked example

Say a landlord buys a £160,000 lot at Bond Wolfe as an additional property. On auction day: £16,000 deposit plus the £2,700 administration fee, £18,700 leaving the account before the champagne. Within 28 days: the £144,000 balance, via cash, mortgage or bridging, a financing squeeze our separate 28-day completion guide covers in more detail. Within 14 days of completion: stamp duty at the additional-property rates, which on £160,000 comes to £8,700, made up of 5% on the first £125,000 and 7% on the remaining £35,000. Total cash out for the month: £171,400 for a £160,000 property.

Set your maximum bid from the all-in number, not the hammer number. Before bidding, have the legal pack costed so the contract fees are no surprise: you can compare auction-ready conveyancing quotes from regulated firms in minutes.