From 10,000 miles away having bought at auctions where buyers premium is used I always thought what I paid was the the auction price under the hammer to the owner which is the sale price. The buyers premium was an annoyance to pay to someone else............. The buyers premium is a second but distinctly separate legal agreement to pay the auctioneer a set commission rate ontop of what I am paying to the owner. This is related to the sale price but is not part of the overall sale price.......... As an example of the earlier argument to include the Buyers premium as part of the sale price you therefore must also add all the other sundary costs associated with a buyer purchasing the property..........state and federal taxes..........lawyers etc etc to maintain consistancy of the argument........In simple terms the sale price is $415,000 under the hammer to the owner under auction conditions .........and the buyer then pay's a fee to the auctioneer who is a separate party........... No differant than fees paid to a lawyer, surveyor etc. ..........SOLD for $415,000 to the gentlemen in the front row........is what the people heard at the auction and its the price.