Calculate an auction purchase's total cost
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The hammer price is only one part of an auction purchase. Add the sale's actual charges, applicable tax amounts and the costs of collection and putting the equipment into use. Work backwards from the approved total to find the bid limit.
Keep two views where needed: the cash that must be paid and the business's eventual accounting cost. Do not assume VAT is recoverable or deduct a possible recovery from the cash needed to complete the purchase.
Write the cost equation first
For a proposed bid, calculate:
Total cash required = hammer price + applicable sale charges + applicable taxes + collection + receiving-site work + other approved allowances.
Read the terms to establish which charges depend on the bid, which are fixed and how tax applies to each line. Do not use a remembered premium from another sale.
Use the collection budget for disconnection, packing, loading, transport and unloading. Add installation, commissioning, essential missing parts and other relevant costs without counting a quoted inclusion twice.
A fictional bid-limit example
This example demonstrates the arithmetic only. Its prices and charge factor are invented and do not describe UK Auction Group or a typical auction.
Assume:
- The business approves a maximum cash outlay of £6,000.
- Collection and receiving work, including the example's applicable taxes, total £1,200.
- A separate uncertainty allowance is £300.
- For this simplified example only, the complete auction invoice equals 1.25 times the hammer price. That invented factor includes all example sale charges and taxes; there are no other invoice lines.
The amount available for the auction invoice is:
£6,000 − £1,200 − £300 = £4,500.
The maximum hammer price is:
£4,500 ÷ 1.25 = £3,600.
Check it forwards: £3,600 × 1.25 = £4,500, then add £1,200 and £300 to reach £6,000.
Do not copy the 1.25 factor into a real budget. Real charge bases may differ, and fixed charges require separate treatment. Ask the organiser to confirm the invoice calculation for a candidate bid if the terms are unclear.
Test the budget when a cost changes
In the same fictional example, suppose collection and receiving work increase by £500. The invoice budget falls to £4,000 and the hammer limit becomes £3,200.
The £500 external increase reduces the hammer limit by £400 because the example invoice factor also applies to the bid. This is why simply subtracting a new transport cost from the old hammer limit can produce the wrong result.
Round down to an available bid that remains within the approved total. Do not round up just because it is the next convenient increment.
Keep the assumptions with the approval
The pre-bid decision sheet should state the cost basis, current quotations, unknowns and person approving the limit. Revisit it when inspection findings or collection requirements change.
After purchase, use the invoice reconciliation guide to compare the actual invoice with the approved calculation. Government invoice guidance identifies charges, applicable VAT and the total owed among the information an invoice should show.
For a specific lot, ask UK Auction Group to clarify the applicable sale charges and collection terms. Obtain tax advice where needed, then approve a bid limit from the complete calculation rather than the displayed price alone.
Sources
This guide gives general information. Equipment-specific, legal, tax and safety decisions may need a qualified adviser or competent specialist. The guides do not promise sale prices, fees or results.