Buyer's premium
-Auction Invoice
Buyer Cost Calculator
Estimate the all-in invoice total from hammer price, buyer's premium, taxes, shipping, handling, and additional fees.
Enter invoice assumptions
The calculator will estimate the premium, tax, fees, and all-in buyer cost.
Tax estimate
-Total fees
-Estimated invoice total
-Buyer cost estimate for auction invoices
Use AuctionMath's buyer cost calculator to estimate how buyer's premium, sales tax, shipping, handling, and additional fees affect the final amount owed after an auction purchase. This tool is useful for checking auction invoices, comparing purchase scenarios, budgeting for lots before pickup or shipment, and documenting all-in cost assumptions for resale or appraisal records.
Worked invoice estimate
For a $1,000 hammer price, 25% buyer's premium, 8.25% estimated tax, $75 shipping, and $20 handling, the premium is $250. The calculator applies tax to the $1,250 hammer-plus-premium subtotal ($103.13 after cent rounding), then adds $95 in entered fees for an estimated $1,448.13 total.
Check the auction's tax and fee rules
This tool treats the buyer's premium as taxable and adds shipping, handling, and Additional Fees after its tax calculation. Actual jurisdictions and auction houses differ: some fees may be taxable, tax may apply to shipping, and fees may be percentage-based. Enter only charges that belong in the scenario and compare the calculation with the auction's invoice terms.