Independent catalogue of Thailand’s biggest vehicle auctions — checked four times a day, Bangkok time.

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How to buy at a Thai vehicle auction

How to buy at a Thai vehicle auction

bid4buy shows the catalogues; the purchase happens at the auction house. The steps below summarise each house’s published rules.

Before you start

  • bid4buy doesn’t sell vehicles or take bids. You register, bid and pay at the auction house.
  • Times are Bangkok time. Preliminary lists get their lane and start time later, and lots can still move or be withdrawn.
  • Vehicles are sold as they are. Read the group, the star grades and the lot notes, and look at the photos and the inspection report.
  • The start price is where bidding opens. The house adds its fee per vehicle, and some lots add 7% VAT on top of the winning price.

AUCT

Union Auction PCL (สหการประมูล): 13 branches, bidding at the yard or online in AUCT LIVE.

Rules checked on 16 Sep 2026. Always confirm with the auction house before bidding.

  1. Register as a bidderAnyone can bid; you don’t need to be in the car trade. Register on the AUCT website or at any branch.Bring a certified copy of your Thai ID card. Foreigners need a passport plus a Thai work permit or a residence certificate. Companies bring a company certificate issued within 3 months, the ภพ.20 VAT certificate and a director’s ID. Someone bidding for you needs a power of attorney.
  2. Place the depositAt the yard: ฿20,000 for cars and farm vehicles, ฿5,000 for motorcycles, by QR code or credit card only. It is returned the next day whether you win or not, and it doesn’t count toward the price.Online in AUCT LIVE you deposit at least 10% of what you plan to bid; your bidding limit is 10 times the deposit.
  3. BidAt the yard you raise your numbered paddle. Online you bid live in AUCT LIVE on the website or the AUCT Application, or set a proxy bid — a maximum placed in advance.When an on-site bid and an online bid are equal, the on-site bidder wins. In photo auction lanes, read each lot’s notes for where the vehicle is parked.
  4. PayOn auction day, by 18:00 or within 1 hour after the lane ends, pay either the full amount or the fees plus a deposit of at least 10–20% of the price (it depends on the seller). The balance is due within 3 working days.Bank transfer or QR code; Visa and Mastercard only at the head office and some branches, with the card fee paid by the buyer. If you don’t pay, AUCT can keep the bidding deposit, cancel the sale and charge any shortfall after re-auctioning. Online wins can’t be cancelled.
  5. Know the feesFee per vehicle, VAT included: car ฿12,840 (฿6,420 if the opening price is ฿10,000 or less); motorcycle under 250 cc ฿2,140, under 500 cc ฿3,745, 500 cc and up ฿5,350; 6-wheel truck ฿14,980; 10-wheel truck ฿18,190; farm vehicle ฿9,630.Some lots add 7% VAT on the winning price. The buyer also pays transfer costs, taxes, fines and stamp duty.
  6. Collect the vehicle and transfer itCollect the vehicle the same day or within 7 working days after paying in full; AUCT’s delivery service takes 4–9 working days. The registration book and transfer papers are ready in about 15–30 working days, at a branch or by free EMS through LINE.You transfer ownership at the provincial land transport office within 60 days of the auction. Foreigners can register a car in their name with a passport, a valid visa, a residence certificate or lease and an embassy or employer letter; it can take longer.
  7. Read the gradeGroups: G — normal condition, restored flood cars included; U — can’t be driven, sold as is; I — no responsibility for the ownership transfer; W — flooded and not restored; S — salvage, not graded.Stars from 1 to 5, where 5 is best: body structure is the main grade, engine and interior are graded separately. Motorcycles are graded on frame, engine and electrics, and condition and equipment.

Sources

Carro

Carro Auction, run by Motto Auction (Thailand) Co., Ltd.: 18 locations, bidding at the yard or online in InnoCast.

Rules checked on 16 Sep 2026. Always confirm with the auction house before bidding.

  1. Register as a bidderDealers, companies and private individuals can buy. At the yard you register for a bidding card with a certified copy of your ID card or passport; foreigners use a passport plus a Thai work permit or address certificate. Companies bring the company certificate, ภพ.20 and a director’s ID.Online bidding needs a membership first: sign up at customer.motto.auction with phone OTP, a photo of your ID or passport and a selfie, then verification at the service counter.
  2. Place the depositBidding card at the yard: ฿20,000 in cash or cashier’s cheque. Online membership: ฿40,000, and members don’t pay the 10% deposit on auction day.Carro’s pages give different refund times for the membership deposit — ask the branch before you pay.
  3. BidAt the yard the auctioneer sells once the approved price is reached and records your card number. Online you bid live in InnoCast (Simulcast) or leave advance bids; Bid & Buy lots can be bought at any time.Vehicles can be viewed at the yard one day before the auction. Carro asks buyers to check the inspection report linked from the lot before bidding.
  4. PayOn auction day pay in full, or a 10% deposit plus fees with the balance within 3 working days. Bank transfer, Visa or Mastercard (card fee paid by the buyer), or the online payment page by QR code or card. The vehicle is released once the money reaches Carro.If you don’t pay within 3 working days the deposit is kept, the sale can be cancelled and non-payers are blacklisted. Refusing the vehicle costs 10% of the price plus the full fee.
  5. Know the feesFee per vehicle, VAT 7% included: 4-wheel vehicle ฿12,840; 6-wheel truck ฿14,980; truck with more than 6 wheels, bus, tractor head or trailer ฿18,190; farm vehicle ฿8,560; motorcycle up to 250 cc ฿2,140, 250–500 cc ฿3,745, over 500 cc ฿12,840; non-running vehicle with a start price under ฿20,000: ฿6,420.Online wins add ฿1,420 per vehicle (฿250 for motorcycles). Lot notes list extra charges, such as registration processing or a transfer fee, and whether the price includes VAT.
  6. Collect the vehicle and transfer itTake the vehicle within 7 days of paying in full. The registration book takes about 15–30 working days; track it on carroauction.com/bluebook and choose pick-up or EMS.You transfer ownership at the provincial land transport office within 60 days of the auction (some lots allow 90). Carro’s registration desk offers a transfer service Monday to Friday.
  7. Read the gradeGroups: G — normal condition; U — can’t be driven, sold as is; N — no responsibility for the ownership transfer; W — flooded, not yet restored; S — accident salvage. Stars from 1 to 5, where 5 is best, for structure (the main grade), engine and cabin.Registration lights show the transfer status, not the condition: green — the registration book is ready; yellow — delays, fines or unpaid tax are possible; red — the vehicle can’t be registered.

Sources

SIA

Siam Inter Auction (สยามอินเตอร์การประมูล): cars, motorcycles, trucks, buses and machinery, at the yard or online at auction.sia.co.th.

Rules checked on 22 Sep 2026. Always confirm with the auction house before bidding.

  1. Register as a bidderRegistration and the customer desk are on home.sia.co.th; SIA also answers on LINE @sia.co.th and on 02-119-7111.How much you may buy depends on the customer type: for your own use 1 vehicle and 1 motorcycle, a dealer 5 vehicles and 10 motorcycles, a member as many as they want.
  2. Place the paddle depositPaddle deposit (เงินมัดจำป้าย) per bidder: motorcycle ฿5,000; 4-wheel vehicle ฿20,000; truck of 6 wheels and up, bus or farm machinery ฿50,000; construction machinery ฿50,000.
  3. BidAt the yard, live online at auction.sia.co.th, as an advance bid in the Proxy system, or in TIMEFIX. The calendar of the auctions is on home.sia.co.th.The auctioneer raises the price by ฿1,000 a step for motorcycles and by ฿2,000 for everything else. Vehicles can be seen and the desks are open from 8.30 to 18.00.
  4. Know the feesFee per vehicle on SIA’s sheet, before VAT: 4-wheel vehicle ฿12,000; truck of 6 wheels and up, bus or farm machinery ฿19,500; construction machinery, running or not — loader, excavator, crawler, crane, road roller — ฿25,000; motorcycle up to 199 cc ฿2,000, 200–499 cc ฿3,500, 500 cc and up ฿5,000.SIA adds 7% VAT to the sheet, so what you pay is ฿12,840 for a 4-wheel vehicle, ฿20,865 for a truck, bus or farm machine and ฿26,750 for construction machinery; motorcycles come to ฿2,140, ฿3,745 and ฿5,350.A lot can carry its own fee and a transport charge, both before VAT as well, and the lot notes say whether the price carries 7% VAT and in how many days the ownership has to be transferred.
  5. Collect the vehicle and transfer itThe registration book is tracked on regbook.sia.co.th. Transfer the ownership within the time the lot notes give — 90 or 180 days on the lots we read — because after it the seller takes no responsibility.

Sources

Questions?

Not sure about a lot or a step? Write to us on WhatsApp or by e-mail.

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