Know the total before you bid

Auction fee calculator

The hammer price isn’t what you pay. Add the buyer’s premium and online commission, with tax, to see your real total before you bid.

Hammer price (your winning bid)

Buyer’s premium

Check the auction house’s terms. Often 20–30%.Online bidding commission

Charged by platforms such as the-saleroom or Invaluable. Often 3–6%.VAT / sales tax rate on fees

UK VAT is 20%. Use your local rate elsewhere.

Your true cost

Total to pay£272.00

Fees add £72.00 (36.0% on top of your bid).

Estimate only. Fees and tax treatment vary by auction house, so always check their terms. Shipping and other charges are not included.