Auction Fee Comparator
Compare fee structures of two auction platforms side by side. Configure buyer premiums or seller commissions, add custom line items, and instantly see which platform is cheaper for your vehicle.
Platform A
Platform B
Shared Assumptions
These costs apply equally to both platforms and are included in the total.
Total Cost Comparison
Platform A
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Platform B
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Fees Only (A)
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Fees Only (B)
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Difference
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Enter values to compare
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Fee Breakdown
Enter values to see breakdown
This calculator is for informational purposes only. Results are estimates and should not be considered financial advice. Always verify calculations with your auction house or financial advisor.
Frequently Asked Questions
How do auction fee structures differ between platforms?
Auction platforms use a variety of fee models. Some charge a percentage-based buyer premium (typically 5–15% of the hammer price), while others charge flat fees per transaction. Many platforms combine both — a percentage-based main fee plus fixed administrative or documentation charges. Seller-side fees can include listing fees, reserve fees, and seller commissions. This tool lets you model any combination to compare the true cost.
What is a buyer premium and how does it affect total cost?
A buyer premium (or buyer's fee) is an additional charge on top of the hammer price paid by the winning bidder. For example, a 10% buyer premium on a $20,000 vehicle adds $2,000 to your cost, making the total $22,000 before any other fees. Buyer premiums are the single largest variable fee component on most platforms, so even a 1–2% difference can significantly impact your total cost.
What is a seller commission and how is it different from a buyer premium?
A seller commission is the fee charged to the seller for listing and selling a vehicle through the auction. It reduces the seller's net proceeds. Unlike a buyer premium (which increases the buyer's cost), a seller commission decreases the amount the seller takes home. Toggle between "Buyer" and "Seller" mode in this tool to compare the relevant fee type for your perspective.
Should I compare platforms based on fees alone?
While fees are a major factor, they are not the only consideration. Other factors include platform reach (number of active buyers), conversion rates, average selling prices, vehicle condition reporting quality, transport partnerships, payment terms, and customer support. A platform with slightly higher fees may generate higher selling prices, resulting in better net outcomes. Use this tool as one data point in your overall platform evaluation.
How do shared assumptions like transport and tax affect the comparison?
Shared assumptions (transport, reconditioning, tax/VAT) are costs that apply equally regardless of which platform you use. They are included in the total cost calculation to give you the full picture, but they don't affect the fee difference between platforms. The "Fees Only" values shown in the output isolate the platform-specific costs for a cleaner comparison.
Can I share my fee comparison with my team?
Yes! Click the "Share Link" button to copy a URL that includes all your current inputs — platform names, fees, and shared assumptions. When someone opens the link, the comparator will pre-populate with your exact configuration. This makes it easy to discuss platform options with colleagues or send comparisons to management.