The reserve auction and the no reserve auction are the same format with fundamentally different psychology. Understanding the difference changes how you bid, how you value the car before the auction opens, and how you behave in the final minutes.
What reserve means in practice
A reserve auction has a minimum price below which the seller is not obligated to sell. The reserve is typically not disclosed publicly. If bidding does not reach the reserve, the auction ends without a transaction.
On BaT, a reserve is indicated by the listing header. You will see "Reserve not yet met" as the auction runs below the threshold. Once bidding crosses the reserve, the listing changes to "Reserve met" and the auction will conclude at the highest bid.
The existence of a reserve changes the early bidding dynamic significantly. Bids below the reserve are partly informational, establishing price anchors without meaningful commitment from either side. Serious strategic bidding typically begins when the reserve is met or approached.
What no reserve means in practice
A no reserve auction will sell to the highest bidder regardless of price. No reserve listings attract more bidders and more early activity. The certainty of a sale creates urgency that reserve auctions do not. More bidders mean more competition. More competition means higher prices, on average, than comparable reserve auctions.
Setting your walk-away number for no reserve
In a no reserve auction, there is no floor and no pressure relief. The car will sell. This means your walk-away number is more important and must be set before you begin tracking the listing, not during the final five minutes of bidding.
Your walk-away number should be based on: comparable sales for the same model in similar condition from the last 12 months, the specific condition and specification of this car adjusted up or down from the base comparable, the cost of any known remediation required, and your total cost of acquisition including the buyer fee, transport, and first-service cost.
Set this number before the auction ends. Write it down. Do not revise it upward during the auction unless you receive genuinely new information that changes your assessment of the car's value.
The buyer fee calculation
BaT charges a 5% buyer fee capped at $7,500. Cars and Bids charges 4.5% capped at $4,500. PCarMarket charges 5% capped at $7,500.
Your walk-away number is a total purchase price number, not a hammer price number. If your walk-away is $50,000 all-in, your maximum hammer bid on BaT is $47,619 because 5% of $47,619 is $2,381, bringing your total to $50,000. Bidders who do not account for the buyer fee systematically overpay.
Final hours behaviour by platform
BaT auctions have a hard end time. Any bid in the final two minutes extends the auction by two minutes. This extension can extend a BaT auction significantly beyond its scheduled end time. Cars and Bids uses a similar extension mechanism.
The implication for your bidding strategy is that proxy bidding - entering your maximum price in advance and letting the platform bid automatically up to that number - is often the cleanest approach. You set your number, the platform represents it, and you avoid the psychological pressure of live bidding in the final minutes.
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