In a lowest price tender, the cheapest compliant bid wins. It’s a simple rule, it’s transparent, and people trust it. But it has a weak spot. A bid can be the lowest because the bidder really is more efficient. It can also be the lowest because the bidder made a mistake, misread the scope, or priced the job at a level nobody could actually deliver.
That’s where the abnormally low bid comes in. It gives the evaluation committee a way to look behind the numbers and ask whether the price is a real competitive edge or a risk the government shouldn’t take on.
It matters to suppliers whichever side they’re on. If you bid very low, you may be asked to prove the price is sustainable. And if a competitor wins with a rock-bottom price, you may find yourself wondering why the department let it through, or, in another tender, why it threw one out.
What Counts as an Abnormally Low Bid
An abnormally low bid is one priced so far under the estimated cost, and under every other bid, that it’s fair to doubt whether the bidder can deliver the contract as specified for that money.
A few things are worth knowing about how this works.
There’s usually no fixed legal percentage. The General Financial Rules don’t set one number that applies everywhere. CVC guidance and departmental manuals expect the buyer to test whether the lowest bid is reasonable, and many departments follow their own internal practice for bids that land well under the estimate. In practice, committees often start asking questions once a bid is 15 to 20% or more below the estimate. The exact trigger moves around depending on the department, the category and how much the estimate can be trusted.
The comparison works in two directions. The bid gets checked against the pre-tender estimate, against published rate schedules where they exist, and against the other bids. If a bid is far below the estimate but close to the other bids, the likelier problem is an estimate that was too high. If it’s far below the estimate and below every other bid, that’s the textbook case for a closer look.
Low and abnormal aren’t the same thing. A low price is what competition is supposed to produce. The real question is whether the price can be explained. A bid becomes abnormal when the bidder’s genuine cost position can’t account for it.
Why Departments Worry About Abnormally Low Bids
The concern is not the price itself. It is what the price may lead to during execution.
When a contractor wins at a price below the real cost of delivery, the gap has to be closed somehow. The common ways are these:
Quality reduction. Cheaper materials, thinner sections, shortcuts in workmanship, or reduced testing.
Delay. Underfunded mobilisation, slow procurement, and thin site teams cause programme slippage and liquidated damages exposure.
Claims and variations. The contractor looks for every opportunity to raise additional payment claims, turning a low bid into a higher final cost.
Unpaid subcontractors and labour. Pressure moves down the supply chain, creating disputes, work stoppages, and statutory compliance problems.
Abandonment or insolvency. In the worst case, the contractor cannot continue, the contract is terminated, and the government must re tender at current prices with the project delayed.
The final cost to the government can exceed what a realistic bid would have cost in the first place. This is why a responsible evaluation does not stop at ranking.
Common Reasons a Bid Turns Out Abnormally Low
Why a bid is low decides how it should be treated, so it helps to know the usual causes.
Genuine efficiency. The bidder may own its equipment, run a plant or quarry nearby, hold stock bought earlier at lower prices, or simply carry less overhead. That’s a fair advantage, and nobody should penalise it.
Spare capacity. A firm with idle resources may price to cover only its marginal cost, just to keep people and machines busy. That can be legitimate, but only if the capacity will really be there when the work starts.
Scope misunderstanding. The bidder missed a requirement, left out an item the specification includes, or misread a quantity or unit. This happens a lot in complex tenders, and it often shows up only when someone goes through the bid item by item.
Arithmetical or transcription error. A misplaced decimal, a wrong unit or a slip while copying rates can pull the total down sharply.
Unbalanced pricing. Some rates are set very low and others inflated, with the high ones placed on items expected to be used in larger quantities. The total looks attractive, but what the department actually pays during execution ends up higher.
Buying in. The bidder deliberately prices below cost to win, planning to make it back through variations, claims or later contracts. This is the pattern the abnormally low bid rule is mainly meant to catch.
Predatory or strategic pricing. A well-funded bidder prices aggressively to push rivals out or to get a foothold in a new market.
Ignoring statutory costs. The price may be low because it leaves out minimum wages, provident fund, insurance, taxes or safety costs.
How Evaluation Committees Identify and Examine Them
The process usually runs in four steps.
Step one: check the bid against benchmarks. The committee sets the lowest bid beside the pre-tender estimate, the schedule of rates for the major items and the other bids. It also looks at the pattern item by item, because a low total can be hiding a handful of extremely low rates.
Step two: ask for a written explanation. If the price looks abnormally low, the bidder is asked to justify it in writing within a set time. The request is normally specific. It names the items or the total in question and asks for supporting detail.
Step three: review the answer. The committee reads the response for credibility and completeness, and checks that it fits with the technical proposal and what the contract requires.
Step four: decide. The committee can accept the explanation, accept the bid with extra safeguards, or reject it as not sustainable. Whatever it chooses, it records the reasons. Turning down the lowest bidder is a decision that auditors will look at and the bidder may challenge.
The whole thing is meant to be fair to the bidder. A bid can’t be thrown out just because it’s low. The bidder gets a chance to explain, and any rejection has to rest on specific grounds.
What a Strong Justification Looks Like
If you’re asked to justify a low price, give the request the same care you gave the bid. A weak reply just says the price is competitive and the company is confident. A strong one shows evidence.
A credible justification usually has these pieces:
A detailed rate analysis for the major items, breaking out materials, labour, equipment, transport, overheads and profit, with quantities and unit costs.
Proof of input costs, such as supplier quotations, purchase orders, stock records or rate contracts for the key materials.
Proof of equipment, meaning registration documents and evidence that the machines will actually be free for this contract.
Realistic productivity assumptions that match the programme you submitted.
Subcontractor quotations, if part of the work will be subcontracted.
Statutory costs like wages, provident fund, insurance and taxes, shown line by line and not assumed.
A clear statement of your advantage, for example a nearby aggregate source, a site presence from another contract, or a manufacturing cost edge.
Consistency with your technical proposal, so the resources, methods and programme you describe match the cost build-up.
If the low price came from a mistake, say so. A bidder who finds a genuine error is better off admitting it than inventing an explanation that won’t survive scrutiny. A false justification, once it’s exposed, brings integrity and blacklisting risks that are far worse than losing a single contract.
Possible Outcomes After the Justification
There are four ways this can end.
Acceptance. If the explanation holds up, the bid stays in the competition. If it’s still the lowest, it gets the contract.
Acceptance with extra security. Many works departments, and some frameworks, ask for an enhanced performance guarantee when the accepted bid sits well below the estimate. The extra security protects the government if the low price leads to a default. If you win this way, count the cost of that guarantee before you celebrate, because it adds to the money you have to tie up in the contract.
Rejection. If the justification is missing, incomplete, inconsistent or just not convincing, the bid can be thrown out, and the reasons should be written down. The earnest money normally goes back to the bidder unless there’s some other ground for forfeiting it, since a low price on its own isn’t a breach.
Referral to higher authority. When the stakes are high or the case is borderline, the committee may pass the decision up to a higher level.
Risks for the Bidder Who Wins on a Very Low Price
Winning at a very low price doesn’t solve your problem. It starts one.
The margin is gone from day one. Any cost overrun comes straight out of a margin that was already thin or negative.
Liquidated damages pile on. A team that’s stretched thin tends to run late, and delay damages deepen the loss.
There’s no cushion for bad luck. With no contingency in the price, a spike in material costs, a bout of bad weather or a delay in getting site access can turn into a real financial crisis.
The relationship suffers. A contractor under pricing pressure usually argues more, claims more and says less. That wears down trust with the department.
Your record takes the hit. Poor delivery feeds into performance evaluations and can affect which tenders you’re allowed to bid on later.
The worst case is ugly. The contract gets terminated, the performance security is invoked, and the contractor faces recovery action and possibly debarment.
A contract won at a loss is rarely a win in any sense that matters.
What Suppliers Should Do Differently
A few habits keep you out of trouble on low-price tenders.
Price from real costs. Build the bid from an honest cost analysis, not from a target number you want to hit. Know what each item costs you and what margin you need before you decide how low you can go.
Keep your rate analyses ready. Hold an up-to-date analysis for your major items, along with a file of supporting quotations. If the department asks you to justify your price, you can reply well inside the deadline instead of scrambling.
Check scope and quantities twice. Many abnormally low bids come from plain misreadings. A second careful pass over the scope, the units and the BOQ transfers catches most of them.
Avoid unbalanced rates. Wild swings between item rates draw attention, and they can get a bid rejected even when the total looks fine.
Show statutory costs. Wages, provident fund, insurance, taxes and safety costs should be visible in your cost build-up, not buried or assumed.
Answer clarifications fast and in full. Think of a clarification request as a second chance to prove the bid. Missing the deadline is usually fatal.
If you lose to a very low bid, stay calm. Compare the award price with your own costs. If you think the winning price can’t be sustained, write down your concern and, where you have specific grounds, raise it through the formal channels. Don’t assume anything improper happened, because a lower price isn’t misconduct. On the other hand, if you believe the department skipped the examination it was supposed to carry out, the complaint mechanism exists for exactly that.
What Departments Should Do to Handle These Bids Well
If you’re the one running the tender, a few habits make the process easier to defend and more likely to work.
Get the estimate right and keep it current. The whole examination rests on it, so a shaky estimate means a shaky decision.
Say in the tender document that abnormally low bids will be examined, and explain how. Bidders then know the rules before they price.
Ask pointed questions in the clarification request. Naming the items and figures gets better answers than a vague “please justify your price.”
Give bidders enough time to reply. A rushed deadline produces thin responses and invites complaints.
Put the analysis and the reasons for accepting or rejecting the bid on file. If an auditor or bidder questions the decision later, that record protects you.
If you accept a low bid, think about extra security or closer monitoring, scaled to how risky it looks.
Above all, be consistent. A department that scrutinises low bids hard in one tender and waves them through in the next will draw criticism from auditors and complaints from bidders alike.
Abnormally Low Bids and Other Evaluation Methods
The idea applies most directly to lowest price tenders, but it shows up in other methods too.
In quality and cost based selection, a very low financial bid paired with a decent technical score can still win the combined ranking. So committees may look hard at the financial proposal to see whether it can really be sustained.
Life cycle cost evaluation has its own version. A bidder might quote a low purchase price and then declare operating costs that aren’t realistic. The offer looks cheap on paper, but it’s abnormal in just the same way.
Whichever method is used, the question underneath doesn’t change: can this offer actually be delivered as described?
Final Thought
An abnormally low bid isn’t something to admire, and it isn’t something to throw out on sight. It’s something that has to be explained. The system is really asking one plain question: is this price real?
For a supplier, the answer gets built well before the bid goes in. It comes from an honest cost analysis, a careful read of the scope and assumptions you’ve actually written down. If you can show how you reach a low price, you’ll usually get a fair hearing. If you can’t, you’re better off not winning at that number, because the contract that follows will take its cost out of you.
The lowest price wins the evaluation. A price you can sustain is the one that wins the contract, gets it delivered and gets you paid in full.
