Copart vs IAAI: How US Car Auctions Actually Work

Most salvage and used cars sold at auction in the United States pass through one of two platforms. They work in similar ways. Understanding the shared mechanics matters more than picking sides.

Where the cars come from

The bulk of the inventory is insurance total losses. When an insurer writes off a car, it sends the car to auction to recover value. The rest is fleet, rental, dealer trade-in and repossession stock. This is why the same damage patterns and title brands appear again and again.

How a sale runs

Both platforms run timed online sales, member based. The core flow is the same:

• Cars are listed with photos, a condition report, title type and a sale date.
• Buyers place a proxy or pre-bid before the sale, then live bidding runs on the day.
• Many lots carry a seller reserve, a hidden minimum. If bidding stops below it, the car goes to "on approval" and the seller decides.
• The winning bid is not the final number. Auction fees, a buyer premium and often a broker fee sit on top.

Membership and access

Both are member platforms. Some sales are open to the public, many require a licensed dealer account or a registered broker to bid. In several jurisdictions a private buyer bids through a licensed broker rather than directly. Guest access usually lets you watch and research but not bid.

Reading the listing

The listing is your main evidence before a car you cannot inspect in person:

• Title type tells you the legal status you will inherit.
• Primary and secondary damage name where the visible damage is.
• Odometer may be marked actual, not actual or exempt. Not actual is a warning.
• Run and drive or start codes describe whether the car moved under its own power at intake.

Fees change the real price

The headline bid can be misleading. Between buyer premium, a fixed or tiered auction fee, gate and storage fees, and broker charges, the total can add a large amount over the bid. Work out the all-in cost before you decide a car is cheap.

The honest comparison

The two platforms differ in fee schedules, the exact wording of their condition codes, and which insurers feed them, but the process is the same on both. A buyer who understands total loss inventory, reserves, condition codes and the full fee stack will do well on either. Pick the one that has the car you want, and read its specific fee schedule before you bid.