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Reverse Auction in Tenders

Bidding live against a falling price is where firms win work they then lose money on. The decision that matters is made before the auction opens.

How it works, and what it does to you

Where a tender uses a reverse auction, the price bids are followed by a live session in which qualified bidders undercut each other within a time window, usually with the current lowest visible and the clock extending on each new bid.

It is designed to drive the price down, and it does. What it also does is put a commercial decision into a few pressured minutes, which is not where anyone makes their best decision.

The firms that come out of reverse auctions well are the ones that decided their floor beforehand, in writing, and stopped there.

Before the auction opens

  • Work out your actual cost, including the deposit locked up, the retention held, and the payment delay you expect.
  • Set a floor and write it down, with whoever is bidding holding the paper. A floor decided in the room is not a floor.
  • Know the escalation position. A long contract without a price adjustment clause carries the input risk — see our page on price escalation.
  • Test your setup on the machine you will bid from, well before the session.
  • Have the certificate and encryption working, and validity comfortably past the date.

Written 5 September 2026. Government requirements and portal behaviour change — message us to confirm before you rely on any date or figure here.

The trap in winning too low

A rate below cost is not a foot in the door. It is a contract you must perform, with a performance guarantee behind it and a liquidated damages clause if you do not. Walking away costs the deposit and can bring debarment — see our page on blacklisting.

And an abnormally low bid is often queried anyway, with the authority asking you to justify it or furnish additional security.

Common questions

At the cost of the deposit, and potentially your standing with that authority. Treat the bid as binding, because it is.

That is the design. A written floor is the defence against it.

Not necessarily. Abnormally low bids can be examined, and some tenders evaluate on more than price.

The same Class 3 certificate usually works, registered on that portal. Test it in advance.

Send us your case

Send the tender and the auction date. We will check your documents and flag the clauses that affect your floor.

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