Buying Cars at Auction

On September 3, 2026, a 2020 Ferrari 488 Pista Spider sold on Bring a Trailer for $1,510,000, the largest car sale on our tape that week. The buyer’s fee was $7,500, because Bring a Trailer’s 5% stops at $7,500 however high the bidding goes. That is 0.5% of the price. Had the same car hammered for the same money at RM Sotheby’s Monterey sale three weeks earlier, the premium under that sale’s published terms, 12% on the first $250,000 and 10% on the balance, would have been $156,000. Same car, same price, a $148,500 difference in what the buyer wired.

Eight months earlier, over thirteen days in January 2026, Mecum sold $441M of cars at Kissimmee, Florida, the largest collector-car auction ever held, led by a 1962 Ferrari 250 GTO at $38.5M. In August the Monterey week sales totalled $755.6M, a record by a wide margin, with a Shelby Cobra Daytona Coupe at $42.9M. Those cars did not sell on a website with a $7,500 cap, and they will not next year either. The two halves of the auction market are not competing for the same lots; they charge very different prices for very different services, and the buyer who knows which service they are paying for keeps the difference.

This guide is about that choice: the mechanics of every room where collector cars trade at auction, what each charges, how to buy a car you have never seen from a seller you have never met, what the state wants when you register it, and how to read a result that says “reserve not met.” The flagship guide, Investing in Collector Cars, covers whether to own one at all; this one assumes you have decided to.

A collector car pays no dividend, so every dollar of friction comes straight out of whatever appreciation the car manages, and the friction at auction is paid twice: through the buyer’s premium the house adds to the hammer price when you buy, and through the seller’s commission it subtracts when you sell. Both are set by the venue, not the car.

The buyer’s premium is the number the venues publish and compete on, a percentage added to the hammer price, the winning bid before any fee. At the catalogue houses, the live sales with printed catalogues, the US rate in 2026 is 12% of the first $250,000 of hammer and 10% of the balance: RM Sotheby’s states it in the bidder information for its Monterey 2026 sale, Gooding Christie’s in its Pebble Beach 2026 conditions, Bonhams publishes the same schedule for US motor cars, and Broad Arrow’s General Conditions of Sale use the identical split (its non-car lots carry 20% in North America and 25% in the UK and Europe).

The volume rooms are a point or two cheaper: Barrett-Jackson charges 10%, and Mecum 10% on site and 12% for telephone and internet bids under the schedule published for its Las Vegas motorcycle sale, a schedule we could not confirm for its car sales (the volume rooms, below). The online platforms charge 5% with a cap: Bring a Trailer and Cars & Bids at $7,500 with a $250 minimum, PCarMarket at $7,500 with a $500 minimum; Collecting Cars charges US buyers 6%, also capped, at the dollar equivalent of the £6,000 cap its FAQ states for cars and bikes, about $6,000 (the dollar figure is inferred from the sterling one, not confirmed).

The cap is the whole story. A percentage fee scales with the car; a capped fee stops. On a $50,000 car the platforms and the catalogue houses are $2,500 against $6,000, a gap you might tolerate for a catalogue and a tent at Pebble Beach. On a $150,000 car it is $7,500 against $18,000. On the $1.51M Pista Spider it is $7,500 against $156,000, and no amount of catalogue photography closes it.

The seller’s side is less visible and often larger. Bring a Trailer charges the seller a flat $99 for its Classic listing, and the other three platforms charge the seller nothing. The catalogue houses charge a commission negotiated lot by lot and rarely published; the trade quotes 5–10% of hammer for an ordinary consignment, with marketing and entry fees on top, and the rate falls toward zero only for the lots the house is competing to win. Barrett-Jackson’s terms put the seller’s commission at 8% of hammer on a no-reserve car and 10% on a reserve car; secondary guides put Mecum’s at about 10% plus an entry fee. Add the two sides and a $150,000 car costs its two owners about $7,600 to trade on Bring a Trailer and $25,500–$33,000 through a catalogue house.

The flagship guide sets those numbers against the return: the Knight Frank top-end index made +58.9% over the ten years to Q4 2024, about 4.7% a year, against roughly 13% a year for the S&P 500 with dividends (The Wealth Report 2025; S&P Dow Jones Indices). At 4.7% a year, the $10,500 difference in buyer’s premium on a $150,000 car is a year and a half of appreciation, and the full catalogue round trip is four years of it.

An auction makes the second-highest bidder set the price, and every reading of a result should start from that fact. The winner pays one increment more than the last person who dropped out, so a strong result needs two committed buyers; a car with a single admirer sells at the reserve or not at all. That is why thin markets produce erratic results: on a Tuesday in February there may be one buyer for a particular Lancia, and in the Monterey tent in August there may be four.

The reserve is the seller’s confidential minimum. If bidding does not reach it the lot is passed, shows “reserve not met,” and stays with the seller, and the venue’s fee falls to a small no-sale charge or nothing. A no-reserve lot sells to the high bidder whatever the number; Barrett-Jackson runs almost its entire Scottsdale sale that way, which is why it sold every one of the 1,874 vehicles it offered in January 2026 (Hagerty, January 2026), and Bring a Trailer marks no-reserve listings prominently because buyers bid harder when they know the car will trade. The estimate printed in a catalogue is the house’s guidance, set with the seller, and by convention the reserve may not exceed the low estimate, which makes the low estimate a ceiling on the seller’s floor.

Live and timed auctions discover price differently. A live sale runs in minutes: the auctioneer opens below the estimate, takes bids from the room, the telephones and the internet, and drops the hammer when the bidding stops. A timed online auction runs for a week, and almost all of the price is discovered in the final minutes because bidders have no reason to show their hand early; Bring a Trailer’s and Cars & Bids’s rules extend the clock by two minutes whenever a bid arrives in the last two minutes, so the auction runs until two minutes pass without one (both platforms’ FAQs, as quoted in the 2026 Sherpa and AmeriFreight guides).

A listing showing $60,000 with an hour to run tells you almost nothing; the same listing at $118,000 twenty minutes after its scheduled close tells you two people wanted it.

Who is on the other side matters as much as the mechanism. On the platforms the sellers are private owners and small dealers, and the bidders are enthusiasts, dealers buying below their retail ask, and flippers who will relist within the year. At the catalogue houses the sellers are estates, collections and dealers placing cars they cannot sell privately, and the buyers include the same dealers plus the very small population that buys seven-figure cars. At Barrett-Jackson and Mecum the crowd is the product. Each crowd prices the same car differently, and the fee schedule is only part of the reason to pick one over another.

Bring a Trailer began in January 2007 as a blog pointing readers to cars listed elsewhere, launched its own auctions in 2014, was bought by Hearst Autos in June 2020, and by 2025 was the largest collector-car auction venue in the world by lots sold. Its year-end release for 2025 reported $1.713B of sales across 49,486 listings, of which 40,465 sold, an 81.8% sell-through, an average of 951 listings a week, and 1.65M registered users, up 11% (BaT via The Shop and Carscoops, January 2026). Sales were $1.4B in 2023 and $1.5B in 2024 (CNBC, January 2024; Yahoo Autos, January 2025), so the platform grew through the broad market’s four-year decline that the flagship guide documents.

The listing process is the part sellers underestimate. You submit the car with photographs and a description; BaT’s auction specialists accept it or decline it, and acceptance is not automatic, which is a large part of why the results are trusted. Accepted listings are written by BaT’s staff into the house style, a neutral inventory of what the car is and what is wrong with it. The seller chooses Classic at $99, Plus at $429 with professional photography, or White Glove from $2,500 for high-value cars (2026 fee guides), sets a reserve or goes no-reserve, and must answer questions in the comments while the seven-day auction runs.

For the buyer the fee is 5% of the winning bid, $250 minimum, $7,500 maximum, charged to the card on file when the auction ends. Payment for the car goes to the seller, and since March 2024 the platform has offered Verified Checkout, run with the payments company Caramel (bought by eBay in January 2025) and included in the buyer’s fee, in which the buyer’s funds are held and released against the title: on cars under $75,000 the full amount within a business day of BaT receiving the title, and on cars above $75,000, or collected before the title arrives, half at pickup and the balance against the title (Caramel, 2024). That is not a full legal escrow, but it closes the gap in which a buyer has wired six figures to a stranger and holds nothing.

Two features make the results usable as data. Every auction, sold or not, stays on the site permanently with its full bid history and comment thread, and “reserve not met” listings show the high bid, which the catalogue houses do not publish for passed lots. A model page on Bring a Trailer is a price history with the failures left in, and it is the first place to look before any price guide.

The comment thread under a Bring a Trailer listing is the cheapest expert inspection in any collectible market, and it works because the incentives run the right way: the people who know a model best are the people most irritated by a listing that misdescribes it. A serious listing for an air-cooled Porsche or a Ferrari 348 draws the marque specialists, previous owners, the shop that did the engine, and someone who has pulled the car’s history from the registry. They post the questions the seller would rather not answer, and the seller has to answer them in public while the auction is live.

Reading the thread is a skill. The useful comments are specific: whether the VIN plate rivets are original, a fuel-tank date code later than the build, a request for a cold-start video, a link to the car’s previous sale on the platform at a lower price. Weigh a comment by the commenter’s history with the model, which the platform shows, and by whether the seller answers with a document or a sentence. An absence of criticism is not evidence, but a thread with forty comments and no technical question is a thread the specialists skipped, and that is evidence.

The thread is also where an auction comes apart. A 590-mile 1995 Nissan 240SX drew commenters who questioned its history and then matched a bidder’s handle to the consigning dealer; the dealer admitted to The Drive that he had bid on his own car, saying his aim was not to raise the price but to get the platform to pull a listing he considered incomplete, and Bring a Trailer withdrew the auction on March 28, 2022 (The Drive and Carscoops, March 2022).

In 2023 the seller of a 2015 Mercedes-AMG G63 with a $90,000 reserve, nervous about the price, bid his own car up to $86,000, won it, and owed the platform the 5% buyer’s fee on it, $4,300 (Carscoops, September 2023). Both are told as scandals; they are better read as the system working, since in each case the behaviour was surfaced by the public record and the seller paid for it.

Because every past auction is permanent, a car that has been through the platform before carries its earlier listing and price, and commenters post the link within the first day. A relisting after a “reserve not met” tells you the seller’s floor; a relisting a year after a sale tells you what a flip in this model looks like.

Invest Alternative reads Bring a Trailer’s public results page every day and stores two numbers from it: the median sold price and the sell-through across the latest 36 listings, with no price floor and no filtering by category. That is a small sample that mixes cars with the motorcycles, parts and memorabilia the platform also sells, so it is a read of the platform’s daily pulse, not of the collector-car market and not of the platform’s annual figures. Between September 1 and 8, 2026, the median moved between $14,175 and $35,500 and the sell-through between 66.7% and 83.3%, which in a 36-listing window is the difference between 24 and 30 lots finding a buyer. On September 8 the median was $18,375 and the sell-through 77.8%, or 28 of 36.

The September 2 spike to $35,500 is the sample doing what small samples do: that day’s notable lots included a 993-mile 2018 Porsche 911 GT2 RS Weissach and a 196-mile 2024 Porsche 911 S/T at $805,000 each and a 12,000-mile 2009 Ferrari 430 Scuderia Spider 16M at $760,000, and a run of six-figure cars in a 36-lot window lifts a median that otherwise sits in the high teens. Two days later the 190-mile 2023 Ferrari 812 GTS made $897,000 and the median was back at $18,500.

Cars of that kind, delivery-mileage exotics a few years old, are the subject of the sister guide Investing in Modern Limited-Production Cars. The lesson here is not the level; it is that a daily median from a mid-market platform describes the ordinary lot, while the top of the same platform is a different animal that the catalogue houses would have charged $81,000–$95,000 in buyer’s premium alone to sell.

Sell-through is the series we watch, because it is the reserve meeting the bidders in public. The platform’s full-year 2025 figure was 81.8%; our window ran below that on every day of the week but one, consistent with a September in which sellers who missed the Monterey money are testing reserves the market will not meet. A falling sell-through with stable medians means sellers’ expectations are ahead of buyers’, and that is the condition in which the patient bidder gets a car at the reserve rather than above it. Our threshold, stated in the flagship guide and repeated here, is a sustained reading below 70% on our window.

Cars & Bids, Collecting Cars and PCarMarket run the same timed format and compete with Bring a Trailer on the cars they specialise in, on fees and on the crowd; register on all four, because the same car draws a different room on each.

Cars & Bids was founded in 2020 by the reviewer Doug DeMuro and concentrates on modern enthusiast cars, roughly 1980s onward, with a younger bidder base. Until February 2025 it undercut BaT with a 4.5% fee capped at $4,500; on February 25, 2025, after a round of layoffs, it raised the fee to 5% with a $250 minimum and a $7,500 cap, matching BaT exactly (Autoblog and The Autopian, February 2025). Listing is free. The practical difference is the crowd: a 2015 BMW M3 or a Lexus LFA meets more of its natural buyers there, and results for cars older than about 1990 are thinner.

Collecting Cars, founded in London in 2019, runs the format in the UK, Europe, Australia and the US. Listing is free and the buyer’s premium is 6% for US buyers, with local taxes added elsewhere (7.2% in the UK, 7.14% for EU bidders buying from Germany, 6.6% in Australia, per its FAQ). The premium is capped too: the FAQ puts the cap at £6,000 for cars and bikes, with an equivalent in each market, which at about $6,000 is a lower ceiling than the $7,500 on the American platforms (we could not confirm the dollar figure on the day of checking).

The extra point makes it the dearest online room below $100,000, where the 6% is paid in full, and the cheapest above about $120,000, where the American platforms’ 5% passes the $6,000 that Collecting Cars stops at; between those two prices the rooms are within a few hundred dollars of one another. Its value to an American buyer lies in European-market and UK-registered cars that an importer can bring in.

PCarMarket is a Porsche-first platform that has broadened to other marques and charges the buyer 5% with a $500 minimum and a $7,500 maximum; the seller pays nothing except in the race-car category, where the seller is charged a fee equal to the buyer’s premium (PCarMarket buyer agreement and terms, 2026). Its bidder base is narrower and more specialist, a virtue for a GT3 with track history and a weakness for anything the Porsche crowd does not want.

What the four share is a public, permanent record, a comment thread, a timed format that discovers price in the last minutes, and a fee small enough to make a round trip inside a year survivable. What none of them offers is a room full of the specific buyers for a specific seven-figure car on a specific afternoon, which is what a catalogue house sells.

RM Sotheby’s, Gooding Christie’s, Bonhams and Broad Arrow hold live sales, print catalogues, employ specialists who research and write each lot, and take the cars that need that treatment. RM Auctions became RM Sotheby’s when Sotheby’s took a 25% stake in February 2015; Gooding & Company, founded in 2003, became Gooding Christie’s after Christie’s agreed to buy it in September 2024, a deal that closed at the end of that year; Bonhams is the London house whose car department holds the Quail Lodge sale in Monterey week; and Broad Arrow was founded in 2021 and bought by Hagerty in August 2022 (Sotheby’s and Christie’s announcements; Hagerty Form 8-K, 2022).

Broad Arrow’s 2025 release reported 949 lots sold for $257M at an 88% sell-through and $624M of total transactions including private sales and financing, up from $316M in 2024 and $180M in 2023 (GlobeNewswire, December 18, 2025). It is the only one of the four that publishes an annual figure in that form; the others report sale by sale.

What the buyer gets for the 12%/10% is the catalogue and the specialist behind it: a written description the house stands behind under conditions of sale that are precise about what is warranted (title, and usually the identity of the car) and what is not (condition, originality, matching numbers unless stated). Read the conditions before you bid, because the house’s liability is limited to what they say it is, and a catalogue’s “believed to be” and “according to the consignor” are load-bearing phrases.

Consignment is where the money moves. The seller’s commission is negotiated: a house competing for an important car will cut it to zero, absorb the marketing, and sometimes offer a guarantee, a minimum price the house promises the seller regardless of the result, carried by the house or laid off to a third party who then bids with an interest in the lot. Guarantees are common in art and rare in cars, appear on marquee lots, and are disclosed in the catalogue when the house has a financial interest; a lot marked that way is one where the printed estimate is not neutral guidance. For an ordinary $150,000 consignment there is no guarantee, the commission sits in the 5–10% range the trade quotes, and entry, transport and photography fees come on top.

Two further mechanics distinguish this room, and both are taken up under reading a result: the house may bid on the seller’s behalf up to the reserve, and a lot that fails on the block can be sold immediately afterward in a private treaty deal the house brokers, at which point it enters the published totals as a sale.

What the catalogue houses are for is the car that needs its story told to a small audience: a 1959 Ferrari 250 GT California Spider, a Le Mans car, a one-owner Carrera GT with the file to prove it. The buyers are a few dozen people, the house knows who they are, and the catalogue is the instrument for reaching them. The 2003 Ferrari Enzo that made $15,185,000 at Broad Arrow’s Amelia sale on March 6, 2026, sold to a room assembled for it, and for that car the 10% is the cost of the room. What the file is worth on cars of that rank is the subject of the sister guide Investing in Blue-Chip Ferraris and Porsches. For a $150,000 car with a hundred comparable sales on Bring a Trailer, the same 12% buys a catalogue entry nobody needed.

Mecum put more than 4,000 lots across the block at Kissimmee in thirteen days of January 2026, against the 949 lots Broad Arrow sold in the whole of 2025, and the volume rooms do it as television. The Kissimmee sale, January 6–18, 2026, at Osceola Heritage Park in Florida, drew about 140,000 attendees and totalled $441M, the largest collector-car auction ever held, against $224M the year before; a single Saturday made $259M on a group of significant Ferraris led by the 1962 250 GTO, chassis 3729GT, at $38.5M, and 54 vehicles sold above $1M (Mecum via Yahoo Autos and Wolf and Mare, January 2026).

Barrett-Jackson’s Scottsdale sale, January 17–25, 2026, sold 1,874 vehicles, every one offered, for $189.1M at an average of $100,915 by Hagerty’s count, almost exactly its 2025 result of 1,944 vehicles and $191.7M (Hagerty, January 2026); Barrett-Jackson’s own release used a broader count of 1,911 vehicles and $195.2M.

The fee is a percentage without a cap on both sides, which pays for the tents, the stages and the broadcast. Barrett-Jackson charges the buyer 10% and the seller 8% of hammer on a no-reserve consignment or 10% with a reserve, plus an entry fee (Barrett-Jackson bidder agreement; 2026 fee guides).

Mecum charges 10% on site and 12% by telephone or internet, plus a 3% surcharge for card payment, under the schedule published for its Las Vegas motorcycle sale, and secondary guides put its seller’s commission at about 10% plus entry fees; Mecum’s site is closed to our search tools, so treat those as the best available reading rather than a verified 2026 term for its car sales. A $150,000 car costs its buyer $15,000–$18,000 and its seller $12,000–$15,000 in these rooms, a round trip of 18–22%, the catalogue range without the catalogue.

Barrett-Jackson’s defining mechanic is no reserve: essentially every car at Scottsdale sells to the high bidder, which produces a 100% sell-through, a deep bidder pool that trusts the car will trade, and occasional results well below what the same car would make on a reserve platform, since a seller who guessed wrong about the room has no floor. Mecum runs reserves and follows a failed lot with “The Bid Goes On,” its post-auction process in which the high bid is posted and the house brokers offers for days afterward; a meaningful share of Mecum’s reported sales close that way, and a buyer who wants a car that passed should call the house on Monday rather than assume it went home.

These rooms are for American iron, muscle, trucks, resto-mods and the modern performance cars whose buyers attend in person; a 1969 Camaro ZL1 or a Ford GT meets more of its natural buyers in Kissimmee in January than anywhere else. For an outsider buying a European sports car in the $50,000–$300,000 band, the arithmetic against Bring a Trailer is hard to justify, and the buyer paying 12% to bid by internet is paying the most in the market for the least information about the car.

The auction year has four fixed points, and the trade organises around them because the houses put their best consignments where the most buyers are.

January: Kissimmee and Scottsdale

Mecum opens the year in Florida over the first two weeks, and Barrett-Jackson, Bonhams, RM Sotheby’s, Broad Arrow and others hold the Arizona sales in Scottsdale in the third. Hagerty’s count for Arizona 2026 was $250.6M across six houses, 2,491 of 3,104 lots sold for an 80% sell-through and an average of $100,588, on about 500 fewer lots than 2025 and a sell-through down from 83% (Hagerty, January 2026). January is the volume market’s week: American cars, trucks, the broad middle, and a first read on the year’s sentiment.

March: Amelia Island

Broad Arrow is the official auction of The Amelia concours and Gooding Christie’s sells the same week; RM Sotheby’s added a Miami sale. The March 2026 total was a record $255.9M against $195.1M in 2025, with Broad Arrow’s $111M sale, 165 of 179 lots for 92%, the largest in Amelia’s 31-year history and Gooding Christie’s $71.2M its second-best there (Hagerty and Hagerty Investor Relations, March 2026). Amelia is the first blue-chip sale of the year and where the modern hypercar and European sports car levels are set; the Enzo, Carrera GT and Miura SV records of 2026 were all Amelia.

August: Monterey

RM Sotheby’s, Gooding Christie’s at Pebble Beach, Bonhams at the Quail, Broad Arrow at the Monterey Jet Center and Mecum sell across the week of the Pebble Beach Concours. The 2026 total was $755.6M, against $432.8M in 2025 and a prior record of $470.7M in 2022, with a sell-through of about 75%, 844 of 1,124 lots by Hagerty’s count, against 76% in 2025, and a $40M charity Ferrari inside the total (Hagerty, August 2026). Monterey is where the records are set and where a seller of an important car wants to be; it is also the most expensive week in the calendar for everything from hotel rooms to marketing fees.

Between the fixed points the houses run smaller sales, among them Broad Arrow’s Air|Water Porsche sale in April ($20M in 2026, led by a 918 Spyder Weissach at $4.68M; GlobeNewswire, April 2026), RM Sotheby’s European sales, Bonhams at Goodwood and Mecum’s monthly regional events. The platforms run every week of the year, which is their structural advantage: a seller on Bring a Trailer does not wait for August.

A published result carries more information than the number, and the information is in the parts the venue would rather you skimmed.

Reserve not met

On a timed platform, a listing that ends below the reserve shows the high bid permanently, and that bid is the market’s opinion of the car that week. If it was $118,000 against a seller who wanted $135,000, the platform invites the two to deal privately afterward and many do, usually near the high bid; a buyer who wanted the car should message through the platform within the day. Three months later, the same car relisted with the previous result in the comments is a seller who has learned the price. At a catalogue sale a passed lot shows no number in the published results, but the room saw it, the house will tell you if you ask, and a post-block sale at the high bid is often available that afternoon.

The bid pattern

On a seven-day auction an early bid at half the expected price is a bidder establishing a position, not information; the price on the last day before the final minutes is the level the interested parties were comfortable at; and the increments in the final minutes tell you how many people were left. Two bidders trading $1,000 increments for fifteen minutes past the scheduled close is a result that will hold on resale. One bidder jumping $20,000 in a single bid to end it is a buyer who wanted the car more than the market did, and the next sale will show it.

Shill and chandelier bidding

A shill bid is placed by or for the seller to raise the price, and every venue’s terms prohibit it; under the Uniform Commercial Code’s auction section, §2-328, a buyer at an auction where the seller bid without notice may avoid the sale or take the goods at the price of the last good-faith bid (UCC §2-328(4)). On the platforms, where the seller cannot bid under the rules, the 240SX and the G63 show what happens when one tries.

The catalogue houses, by contrast, disclose in their conditions that the auctioneer may bid on the seller’s behalf up to the reserve, the practice called chandelier bidding because the bids appear to come from the ceiling; it is lawful where disclosed and never above the reserve, and Hagerty’s “On shills and chandeliers” is a fair account of the line. At a live sale, then, the bidding below the reserve may be the house talking to itself, and the number that matters is where real bidders entered.

Post-sale deals and the published total

A house’s reported total and sell-through include lots sold in private treaty after they passed on the block, and Mecum’s “The Bid Goes On” sales count when they close. That is legitimate and also why headline totals are a lagging, slightly flattering measure: Hagerty’s 75% for Monterey 2026 and Broad Arrow’s 92% for Amelia are both the count after the deals.

What a published price includes

Every result the catalogue and volume houses publish, and every house total in this guide, includes the buyer’s premium; the platforms publish the winning bid, and the fee is charged on top of it. A $150,000 published result at a catalogue house was therefore a $133,929 hammer, and the seller received that less commission; a $150,000 result on Bring a Trailer was a $150,000 bid, the buyer paid $157,500 with the fee, and the seller received $150,000 less $99. Comparing a catalogue result with a platform result for the same model compares two different amounts of money, on the way in and on the way out.

Almost every online purchase is of a car you will not see until it is yours, so the discipline that protects you is the same every time: an inspection you commission, a title you have verified, and a transporter you have insured.

The pre-purchase inspection

A pre-purchase inspection, a PPI, is a paid examination by a mechanic you choose, and on a car at a distance it is the most valuable money in the transaction. A general inspection runs $200–$300; a Porsche specialist’s PPI, with a lift, a factory diagnostic scan and a borescope, is listed at $500–$800 for ordinary models and $800–$1,500 for the GT cars, with a leak-down test quoted on top, and Ferrari specialists charge more (Repasi Motorwerks, MonzaHaus and Chariotz price lists, 2026). Commission it during the auction: on a timed platform you have seven days, the seller is expected to make the car available, and a seller who refuses has answered your question. At a catalogue sale the car is on preview for two or three days and the house’s specialists will talk you through it, but they work for the seller.

The title

The title is the paper that makes the car yours, and the failure modes are specific. Confirm the seller’s name is on it and that there is no open lien, or that a lien release accompanies it. Run the VIN through the federal NMVTIS database and a commercial history service for salvage, flood and odometer brands, and check that the VIN on the title, the door jamb and the dash agree. Watch for the “open title,” signed by a previous owner but never transferred, which is illegal to pass on in most states and marks a flipper who never registered the car.

And know that some states do not title older cars: New York issues a transferable registration rather than a title for vehicles of model year 1972 or older, and Georgia makes titles optional for 1963–1985 model years, so a bill of sale and a registration are the documents in those cases (NY DMV; Georgia Department of Revenue).

Transport

Enclosed transport, a covered trailer with soft ties and a liftgate, is the standard for a collector car and costs $1.30–$2.10 a mile on a typical collector-car move in 2026 guides (rates fall below $1 a mile on the longest routes), 30–60% more than open transport, with cross-country single-car moves quoted from about $1,000–$2,500 by brokers and materially more from the specialist collector carriers (Sherpa, Roadrunner, A1 Auto Transport, AmeriFreight, 2026). Know which carrier the broker has assigned, confirm its cargo insurance limit covers the car, since a $100,000 policy on a $300,000 car is the common gap, and photograph the car at pickup against the inspection report, because disputes are settled by the bill of lading.

Payment

Bring a Trailer’s Verified Checkout holds the buyer’s funds against the title. Elsewhere the choices are a wire against the title in hand, a licensed escrow service you chose, or, at the catalogue houses, payment to the house, which releases the car when funds clear. Never wire the full price to a private seller before the title has been seen, and never accept a seller’s suggested escrow service; fake escrow sites are the oldest fraud in remote car buying.

The auction house does not collect your sales tax in most cases; your state does, when you register the car, and it is the largest cost in the transaction after the price. Every state with a sales tax charges a use tax on a vehicle brought in from elsewhere, assessed on the purchase price at titling, at the state rate plus the county and city additions. At a combined 7%, a $150,000 car owes $10,500 at the DMV counter; where combined rates pass 9% it owes $13,500 or more, and in some states, California and New York among them, the buyer’s premium is part of the taxable price (CDTFA annotations; New York Department of Taxation and Finance). Combined rates vary by county; check yours before you bid.

Five states charge no sales tax on a used vehicle: Alaska, Delaware, Montana, New Hampshire and Oregon, with Alaska allowing local levies (CarGurus; Hagerty, “The Montana License Plate Loophole, Explained”). That is the origin of the Montana LLC: an out-of-state buyer forms a Montana limited liability company, titles the car in its name and registers it in Montana, where there is no sales tax, registration is cheap, there is no inspection, and a vehicle eleven years old or more can be permanently registered. Firms will do it for a fee.

It is a tax-evasion structure in most of the states where the car is actually kept, and the states have said so: use tax is owed where the vehicle is garaged, not where it is registered, and several states, California, Georgia, Illinois, Indiana and Utah among them, have pursued Montana-plated cars with audits, penalties and in some cases criminal charges; California’s investigation recovered about $4M and charged fourteen people, including with conspiracy to commit tax evasion (Hagerty, “California Charges 14”; Bloomberg Tax, “States Ramp Up the Scrutiny on Tax Dodgers”; KSM, “The Montana Loophole Under Fire”; TaxProf Blog, February 2026).

The structure is legal only when the car really lives in Montana. For everyone else the sales tax is part of the price, and the buyer who pays it owns a car that can be sold, insured and registered without a question hanging over it.

The exit tax is federal and is covered in the flagship guide: a collector car held more than a year is a collectible under IRC §1(h)(4), taxed at up to 28%, plus the 3.8% net investment income tax above $200,000 of income for a single filer or $250,000 for a couple, and the 2017 tax law closed the §1031 like-kind exchange to cars. The useful point for an auction buyer is basis, the cost the taxable gain is measured against: the buyer’s premium, the inspection, the transport in and the sales tax all go into the cost of the car and come off the taxable gain, so the receipts from the purchase are worth 28 cents on the dollar the day you sell.

The arithmetic below puts one car, hammered at $150,000, through each venue on the buy side and the sell side, using the published buyer’s premiums, the published or trade-quoted seller’s commissions, and the same car-side costs in every case: a $750 specialist inspection, $3,000 of enclosed transport for a 1,500-mile move, and use tax at 7% on the hammer, $10,500, all of which is basis.

On the buy side, the online platforms charge $7,500 (5% of $150,000 is exactly the cap) and Collecting Cars about $6,000, its cap; Barrett-Jackson and an on-site Mecum bidder pay $15,000; a Mecum internet bidder and any buyer at RM Sotheby’s, Gooding Christie’s, Bonhams or Broad Arrow pays $18,000. Add the fixed $14,250 of inspection, transport and tax and the car costs $171,750 through Bring a Trailer and $182,250 through a catalogue house.

On the sell side, at the same $150,000, Bring a Trailer’s seller keeps $149,901; a Cars & Bids or PCarMarket seller $150,000; a Barrett-Jackson no-reserve seller $138,000 before the entry fee; a Mecum seller at 10% $135,000; and a catalogue-house seller at the trade’s 5–10% between $135,000 and $142,500 before marketing fees, or $138,750 at the midpoint.

Now hold the car. Take the flagship guide’s assumptions: 4.7% a year of appreciation, the compounded rate behind the Knight Frank ten-year figure and generous for a $150,000 car, and $8,000 a year of insurance, storage and maintenance, none of which is basis. After five years the car hammers at about $188,700, and the owner has spent $40,000 keeping it.

Bought and sold on Bring a Trailer, the seller nets $188,601 after the $99 fee, the gain over the $171,750 basis is $16,851, the federal tax at 28% is $4,718, and $183,883 comes back against $211,750 that went out: the trade loses about $27,900 after tax and carry, $10,500 of it the use tax any route would have paid.

Bought at a catalogue house and sold on Bring a Trailer, the basis is $182,250, the gain $6,351, the tax $1,778, and the loss about $35,400. Bought on Bring a Trailer and sold at a catalogue house at 7.5%, the seller nets about $174,550, the gain is $2,800, the tax $784, and the loss about $38,000. Bought and sold at the catalogue houses, the seller nets $174,550 against a $182,250 basis, there is no gain to tax, and the loss is about $47,700. The gap between the cheapest route and the dearest is $19,800, more than the car’s entire after-tax gain at the index rate.

Two things follow. The first is the flagship guide’s conclusion from the other direction: at the index rate a $150,000 car does not pay for itself through any venue, so it has to be the car you wanted. The second is this guide’s: the venue choice is worth about $20,000 over five years on a $150,000 car, a number the buyer controls completely. A car compounding at 9% a year rather than 4.7% turns the Bring a Trailer round trip into a small profit, about $2,400 on the same arithmetic, and still leaves the catalogue round trip about $17,500 under water; the break-even rate for the cheapest route is roughly 8.7%.

The sequence that loses the least money spends its first three months without bidding.

1. Register everywhere, bid nowhere. Open accounts on Bring a Trailer, Cars & Bids, PCarMarket and Collecting Cars; registration needs a card and is free. Read the fee pages and the terms once, properly.
2. Pick one model and follow it for a quarter. Read every auction of it, sold and passed, with the comments and the bid histories, and note the high bid on the passed lots. By the end you will know the price band, the known failures and the three commenters who know the model best.
3. Find the inspector before the car. Identify a marque specialist in each region the model tends to come from and call them; a PPI booked during the auction is only possible if you already know whom to call.
4. Set the all-in budget, then subtract the friction. Premium, use tax at your state’s rate, transport and inspection come off the number before you set a maximum bid: about $21,750 on a $150,000 car through a platform, about $32,250 through a catalogue house.
5. Bid in the last minutes, at the number you set. Early bids only inform the other bidders. Put your maximum in and let the two-minute rule run; if you are outbid, the car was worth more to someone else, and the next one is a week away.
6. Pay against the title, ship enclosed and insured, register within the deadline. Use Verified Checkout or an escrow you chose, confirm the carrier’s cargo limit, and file every receipt, because all of them are basis.
7. Sell the way you bought. The platforms cost $99 and the catalogue houses cost 5–10% plus fees, and a car with a hundred platform comps has no business in a catalogue.

These are the readings that would change the view, each with its level as of September 10, 2026.

• Bring a Trailer’s fee cap. The 5% and $7,500 cap is the structural fact of this market. A higher cap, or a move to an uncapped percentage, narrows the gap to the catalogue houses and changes the venue rule; Cars & Bids’s February 2025 move from $4,500 to $7,500 shows the direction of pressure.
• BaT’s 2026 total against $1.713B and 81.8% sell-through. A second year above $1.7B with sell-through above 80% says the platform is still taking share through a soft broad market; a sell-through in the mid-70s says sellers’ reserves have moved ahead of buyers.
• Our tape below 70%. A sustained reading below 70% sell-through on our 36-listing window (77.8% on September 8, 2026; the threshold is ours) is the earliest sign the enthusiast market is softening further, and the condition in which the patient bidder gets the reserve.
• Kissimmee in January 2027 against $441M, and Scottsdale against $250.6M and 80%. The volume market’s health reads there first; a Scottsdale sell-through below 78% with average price falling would confirm the broad market has not found its floor.
• Monterey in August 2027 against $755.6M and 75%. A total near $500M with sell-through holding near 75% would say 2026 was a peak; a total above $700M with sell-through falling would say the houses are consigning more than the room will absorb.
• Catalogue-house fee changes. The 12%/10% split at $250,000 holds at RM Sotheby’s, Bonhams US, Broad Arrow and Gooding Christie’s; a house raising it, or cutting it to compete with the platforms below $250,000, changes the cost stack every worked figure here depends on.