Gemsmakers · Antique Dealer Tools
Tiered Antique Consignment Commission Calculator
Consignment agreements may charge one rate for low-priced items and another once a sale passes a threshold. This calculator makes the selected tier and its effect visible, then compares the payout with a flat-rate arrangement so dealers and consignors can review terms before accepting an item.
Calculator
Enter your figures below. Results update from the assumptions you supply; check your agreement, fee schedule, and local requirements before making a decision.
How to use this tool
- Enter the item’s final selling price and the agreed minimum commission.
- Enter tiers as one threshold and rate per line: threshold price | commission percentage. The highest threshold not exceeding the selling price sets the rate for the whole sale.
- Enter a comparison flat rate and any additional authorized deductions. Review the commission amount and both estimated payouts.
Calculation method
Selected tier commission = max(minimum commission, selling price × selected tier rate). Flat commission = max(minimum commission, selling price × flat rate). Estimated payout = selling price − commission − additional deductions.
Worked example
For a sale of 800 with tiers 0|30, 500|25, and 1,000|20, the 500 threshold applies a 25% rate to the full sale, giving commission of 200 before any minimum or other deduction. This is a full-sale tier model, not a marginal-bracket model.
Important assumptions and limitations
- Confirm in the written agreement whether the tier rate applies to the entire sale or only the portion above a threshold. This tool uses the full-sale method.
- Do not include deductions that the agreement does not authorize.
- Taxes, refunds, and chargebacks may be handled separately by the consignment shop.
Frequently asked questions
What is a tier threshold?
It is a sale-price level at which a different commission rate begins to apply. This tool picks the highest entered threshold at or below the item’s sale price.
Is the commission progressive?
No. This calculator applies the selected tier rate to the full sale price. A progressive commission that taxes portions at different rates requires a different rule.
What does minimum commission mean?
It is the smallest fee charged even when the percentage calculation is lower.
Why compare a flat rate?
The comparison helps show how much a tiered agreement changes the consignor payout against a single-rate alternative.
Can I use negative deductions?
No. Enter only non-negative deductions. Refunds or reversals should be shown separately in a settlement statement.
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