Buyer's Premium Calculator: Your Real Max Bid, Tax Included

To find your real maximum bid, take the most you are willing to spend, subtract any flat charges like delivery, then divide by (1 + the buyer's premium) × (1 + the sales tax rate). With a $200 budget, a 15% buyer's premium and Maryland's 6% sales tax, your top bid is about $164, not $174 — and certainly not $200.

A buyer's premium calculator that ignores sales tax will let you overspend on every lot you win.

Most "buyer's premium calculator" pages online divide your budget by one plus the premium and stop there. That misses a step. In Maryland and Virginia, the state rules for what sales tax is charged on are written broadly enough that the fee is very likely taxed along with the winning bid. Below is the full formula, a table you can use without a calculator, and what the law in our area actually says.

What does buyer's premium mean?

A buyer's premium is a percentage the auction adds on top of the winning bid. The winning bid itself is called the hammer price. If you win a lot at $100 and the buyer's premium is 15%, you owe $115 before tax, delivery or any other charge.

The premium is not a scam or a hidden trick when it is shown up front — it is simply how many auctions are priced. The problem is that bidding happens in hammer-price numbers, while your bank account feels the total. When the clock is ticking down, it is easy to forget that every $10 you raise really costs you more than $10.

Virginia's licensing rules for auctioneers require all auction advertising to be truthful, with nothing misleading about the terms and conditions of the sale (18VAC25-21-100). So the premium should be stated before you bid. If you cannot find it, ask before you place a single bid.

Is the buyer's premium taxed in Maryland and Virginia?

Here is the part most calculators skip. We could not find a Maryland or Virginia ruling that names the buyer's premium specifically, so this is our reading of the rules themselves:

• Virginia says auctioneers must collect sales tax on the "gross sales price," which the rule defines as the price "without any deduction for commissions, service charges or any other expenses" (23VAC10-210-140). A premium is a charge the auction makes for selling the item, which is the kind of thing that definition refuses to subtract.
• Maryland defines the taxable price as the value of everything the buyer pays for the sale, without deducting any expense or cost, including the cost of services (Tax-General § 11-101(l)). The law then lists the separately stated charges that are left out — delivery, finance charges, installation labor and a few others. An auction fee is not on that list.
• New York, for comparison, answered the question directly. In an October 2024 advisory opinion, its tax department said a buyer's premium is part of the sale price and is taxable, whatever the auction calls it.

The practical lesson: plan as if tax is charged on the hammer price plus the premium. If an auction tells you otherwise in writing, good — you have a small cushion.

How do you calculate your max bid with a buyer's premium and tax?

Use this order. It takes less than a minute.

1. Write down your walk-away total. The most you would pay for the item, all in. Base it on what a new or comparable item costs, not on the excitement of the auction.
2. Subtract flat charges. Delivery, shipping or a fixed handling fee. In Maryland, delivery that is listed as its own line is one of the charges left out of the taxable price, so take it off before the tax step.
3. Divide by (1 + premium). For a 15% premium, divide by 1.15.
4. Divide again by (1 + tax rate). For 6%, divide by 1.06.
5. Round down to the auction's next bid step. That number is your maximum bid. Enter it once and stop.

Worked example. You will pay $250 at most for a lot. Delivery is $15, the premium is 15% and tax is 6%. ($250 − $15) ÷ 1.15 ÷ 1.06 = $192.78. Round down and your maximum bid is about $192. Check it backwards: $192.78 plus 15% is $221.70, plus 6% tax is $235.00, plus $15 delivery is $250.

The mistake it saves. Bid $200 at the same 15% premium and 6% tax, and the total is $243.80 before delivery — almost $44 over the number you had in mind.

What is the real max bid for a $200 or $500 budget?

Here is the formula worked out for you, with no flat fees. The 6% column fits Maryland. The 5.3% column is Virginia's 4.3% state rate plus the 1% local tax that cities and counties may add; some Virginia planning districts add another 0.7% on top (§ 58.1-603.1), so check the rate where your sale takes place.

Two things jump out. First, tax matters less than the premium, but it never disappears: even with no premium at all, a $200 budget only buys a $188 bid in Maryland. Second, every 5 points of premium cost you roughly $7 on a $200 budget and about $18 on a $500 one. On a lot with a 25% premium, a $200 budget really means a bid near $150.

A small note for Maryland: the law sets the tax as 6 cents for each whole dollar plus a set amount for the leftover cents (§ 11-104), so your bill can land a cent above a straight 6%. Round your bid down and it will not matter.

What else should you check before you bid?

The premium and tax are the big ones, but the total can grow in quieter ways. Before you bid, look for:

• Whether the premium is the same for every lot. Some auctions use one rate for the whole sale; others set it lot by lot. Read the rate on the lot you want, not the one you saw last week.
• Whether a handling or lot fee applies. A fixed fee per lot changes the math on cheap lots far more than on expensive ones.
• How you will get it home. Pickup only, or shipping at a price? A great hammer price can turn into a bad deal once you add a truck rental or a long drive.
• Whether a tax exemption is truly yours to use. Resale certificates exist for businesses buying to resell, under each state's own rules. If you are buying for your home, plan on paying tax.
• The rules for paying and collecting. Missing a payment or pickup deadline can cost you the item.

On DealsDMV, bidding itself is free, and where a lot has a buyer's premium it is shown as a percentage before you bid; many lots have none. The bid confirmation repeats your amount and the lot's premium before your bid goes in. For the full details on fees, tax and collecting, see the auction questions on our FAQ, then browse the current auctions.

Why does setting your number first matter so much?

Because auctions reward the bidder who already decided. A fixed maximum, worked out at your kitchen table, keeps a ten-second bidding duel from rewriting your budget. If the price passes your number, the lot was simply worth more to someone else — and there will be another one.

We wrote more about bidding calmly in How to Win an Auction Without Overpaying. If you are new to buying returns and overstock locally, our guide to liquidation stores in Maryland, DC and Virginia covers the options.

Bottom line

A buyer's premium is fair when it is shown up front, but it is only half the story. In Maryland and Virginia, plan for sales tax on the premium too. Subtract flat fees, divide by one plus the premium, divide by one plus the tax rate, round down, and bid that number once. This is general shopping guidance, not tax advice; if a large purchase depends on the tax treatment, ask the auction or a tax professional.

Know someone who bids on local auctions? Send them this table before their next one.