A low-price explanation establishes how the bidder can perform the offered contract at the offered price. Build a cost-sufficiency and evidence pack that reconciles the price to work, resources, supplier commitments, evidenced efficiencies and funding. Record applicable obligations, unresolved gaps and the authority approving each statement. A price difference may prompt scrutiny, but the governing procurement rules and the evidence determine the assessment. There is no single percentage in this guide that makes every tender safe or automatically unacceptable.
The buyer asks why an offer is much cheaper than expected. The response repeats that the team is experienced and uses efficient technology, while the underlying estimate omits an acceptance activity and relies on a supplier quote that does not cover the full service period. A polished explanation cannot supply those missing costs or commitments. The bidder needs to determine what the price actually supports before defending it.
Explain advantages that exist, on the scope and terms offered. Do not improve the explanation by silently reducing the obligation, inventing a saving or assuming later price recovery. The legal references below were checked on 5 September 2026 and have different scopes. This is an evidence-preparation guide, not a legal determination that a particular offer must be accepted. Have procurement counsel confirm the applicable regime, response rights and consequences of any error.
Procedure
A price gap is a warning, not a portable rejection rule
Begin with the procurement named in the notice and the buyer’s actual question. A private RFP, an EU-regulated public tender and a procurement under the UK Procurement Act 2023 do not share one inquiry rule. Even within a country, contract type, sector and transitional provisions can change the applicable route. Do not select the law from the language of the invitation or the location of your sales team. Record the regime and ask a qualified reviewer to resolve uncertainty before making procedural claims.
For procurement within Directive 2014/24/EU, Article 69 requires an explanation where a tender appears abnormally low relative to the work, supplies or services. The European Commission’s 2019 guidance, section 2, distinguishes methods for identifying suspicious offers from the investigation that follows. A numerical comparison can flag a tender. It does not provide a universal percentage below which every bidder must be rejected or above which every price is protected.
The UK Cabinet Office guidance updated on 17 August 2026 explains a different starting point under the Procurement Act 2023: an authority is not required to investigate every apparently low price, but must notify the supplier and provide a reasonable opportunity to demonstrate performance at that price before disregarding the tender on that basis. If the supplier satisfies the authority, the tender may not be disregarded as abnormally low. Confirm that this Act governs the procurement rather than assuming it covers every UK contract.
Treat the comparison table as a route to the relevant rule, not a substitute for reading it. A bidder’s positive margin does not decide the legal question, and a buyer’s suspicion is not yet a final rejection. Other grounds for rejecting an offer remain separate. Your immediate job is to preserve the inquiry, identify the evidence requested and assign the response deadline. If a deadline is unclear or too short to obtain a required document, raise that issue promptly through the permitted channel without assuming an extension.
| Regime | Relevant rule | Practical implication |
|---|---|---|
| EU Directive 2014/24, Article 69 | An apparently abnormally low offer requires explanation and assessment | Prepare evidence tied to the work and the proposed price |
| Germany, VgV § 60 | The buyer requests clarification when price or cost appears unusually low relative to performance | Address the composition of the offer and the documents requested |
| France, L2152-5 and L2152-6 | Manifest undervaluation threatening proper performance is examined through requested justifications | Show how the actual contract can be performed; read R2152-3 to R2152-5 as well |
| UK Procurement Act 2023, section 19 | Notice and reasonable opportunity are required before disregard on this ground | Demonstrate performance at the offered price to the authority’s satisfaction |
Cost sufficiency
Rebuild the work behind the number before defending it
Preserve the submitted pricing file and its version. Work from a copy that identifies each difference between the submitted calculation and your review. Map mandatory deliverables to the relevant cost lines, including mobilisation, acceptance, support, reporting and exit where required. If the tender spans several years, establish whether every period is included and how fixed prices, indexation or extensions were treated. A one-year supplier quote does not substantiate a three-year commitment by itself.
For labour, show the route from activities to paid hours and from paid hours to employer cost. Distinguish the worker’s wage from the rate charged to the buyer and from the bidder’s loaded cost. Check applicable charges, leave, supervision, training and other required inputs rather than asserting that a low hourly figure is compliant because it exceeds one headline wage number. The applicable rules and place of performance need specialist review; this article supplies no universal wage rate.
For purchased services and materials, record what the supplier has actually offered: quantity, specification, delivery date, validity, currency, tax treatment, exclusions and conditions. An informal indication is not a firm commitment. A bulk discount may depend on purchases not established by this contract. Check whether the supplier’s quoted scope includes the same acceptance and warranty requirements you owe to the buyer, and identify the cost of any gap you retain.
Explain shared costs rather than hiding them. Existing equipment or a reusable method can reduce incremental expense, but it still needs usable capacity, maintenance and rights for the proposed work. A cost allocated elsewhere in the organization may need an explanation of the allocation and its funding. Avoid calling a resource free simply because this contract does not purchase it afresh. The model must make clear which costs are included, which are allocated and which remain outside the stated result.
Evidence of savings
Turn “we are more efficient” into a checkable explanation
A saving needs a comparator for the same work. If a method reduces processing time, show the task definition, workload, measured effort, review requirements and remaining exceptions. A demonstration on clean sample data may not represent the buyer’s mixed records. Include setup, validation, quality control and failed-case handling. The buyer needs to understand why fewer resources still deliver the offered outcome, not how impressive the technology sounds.
Article 69 and Germany’s VgV § 60 identify matters such as production or service economics, technical solutions and unusually favourable conditions as possible explanations. France’s R2152-3 also addresses justifications, including the subcontracted share. These categories point to evidence; naming a category does not prove the claim. A favourable supplier arrangement needs its operative terms. An original delivery method needs a credible account of its applicability and cost.
Do not create a saving by comparison with a service you never intended to provide. If the specification requires individual inspections, replacing them with a sample is a scope question, not merely a productivity improvement. If a licence does not permit use for this customer, its low purchase cost cannot establish the offered solution’s viability. Record unresolved constraints before deciding which claims can appear in the explanation.
Keep the date and identity of the evidence. A supplier confirmation obtained during the inquiry may corroborate an existing assumption, but it should not be backdated or presented as part of the original pricing record. Distinguish contemporaneous records from later verification. If the new document changes the basis of delivery instead of confirming it, the authorized reviewer must determine how that affects the response and the procurement.
| Claim | Useful evidence | Question left unresolved by the slogan |
|---|---|---|
| A repeatable method saves hours | Comparable task records, quality results and implementation cost | Does it work on the buyer’s full workload? |
| We obtain lower supplier prices | Valid quote with the offered specification and conditions | Does the discount require uncommitted purchases? |
| Existing assets reduce startup cost | Capacity reservation, maintenance basis and usage rights | Are the assets available when this contract needs them? |
| We accept a lower commercial return | Approved cost reconciliation and funding assessment | Is performance still financially and operationally supported? |
| The subcontractor is cheaper | Matched scope, resources, exclusions and compliance evidence | Has cost or responsibility merely been omitted? |
Worked case
Separate a documented efficiency from an omitted obligation
The fictional Alderwick service offer is EUR 240,000 for the stated twelve-month scope, excluding VAT. A buyer estimate of EUR 300,000 makes it 20% lower than that estimate. All figures are invented for this example; the difference is not a legal threshold. The bidder’s model has 2,400 paid hours at a loaded EUR 45 per hour, EUR 42,000 of bought-in services, EUR 22,000 of operating costs, EUR 18,000 of allocated overhead and EUR 14,000 of risk allowance. Total modelled cost is EUR 204,000.
The EUR 36,000 difference between price and modelled cost is 15% of the offered revenue. Call it headroom on the stated cost basis, not audited profit: financing and tax are outside this simplified calculation. The model also does not prove that the hours or other amounts are sufficient. The price explanation needs the work plan and supporting records, as well as this arithmetic. The buyer’s EUR 300,000 estimate is not evidence that your competitors incur that cost.
Suppose comparable internal records support 3,200 hours under the bidder’s previous method and 2,400 under the offered method, with the same required quality. The gross labour saving is 800 × EUR 45 = EUR 36,000. The new method also costs EUR 12,000, already included within the EUR 22,000 operating line. Its net cost saving is EUR 24,000. The comparable old-method cost is EUR 228,000, not the buyer’s EUR 300,000 estimate. Do not subtract the EUR 24,000 again from the EUR 204,000 total: the new hours and method cost are already in it.
Now the review finds a mandatory acceptance activity costing EUR 56,000 that was absent from every line and from the risk allowance. Corrected cost becomes EUR 260,000, EUR 20,000 above the offered price. This omission is not another efficiency to explain away. Before submission, stop price release and resolve the work, price and approval. After submission, preserve both calculations and obtain advice on the permitted response; do not silently alter the scope, raise the price or promise to recover the shortfall through later extras.
| Component | Amount in EUR | Basis to substantiate |
|---|---|---|
| Labour | 108,000 | 2,400 paid hours × loaded cost of 45 |
| Bought-in services | 42,000 | Scope-matched commitments |
| Operating costs | 22,000 | Includes the new method’s 12,000 cost |
| Allocated overhead | 18,000 | Documented allocation basis |
| Risk allowance | 14,000 | Named exposure; no acceptance activity included |
| Original model total | 204,000 | 36,000 headroom at a 240,000 price |
| Omitted acceptance work | 56,000 | Required activity, absent from original model |
| Corrected model total | 260,000 | 20,000 deficit against the unchanged offer |
Performance conditions
Commercial willingness does not remove an obligation
A business may have a reason to accept a smaller return, but that reason is not evidence that the contract can be performed. If the model shows a loss, identify its amount, timing, proposed funding and effect on other commitments. Obtain the required commercial and finance approval and legal assessment. Neither low profit nor a loss is a universal standalone legal test in this guide. Equally, a board’s willingness to lose money does not establish lawful performance or compel the buyer to accept the offer.
Check the duties that materially affect the cost. Article 69(3) requires rejection when an abnormally low tender results from non-compliance with the applicable obligations referenced in Article 18(2). VgV § 60 and France’s R2152-4 contain related mandatory rejection provisions for the relevant obligations. Review actual environmental, social and labour requirements with qualified advisers. Do not write a general compliance assurance that conflicts with the paid hours, staffing method or supplier terms in the cost evidence.
Subcontracting does not make an unexplained low price disappear. Ask for the evidence needed to reconcile the subcontracted work and the responsibilities retained by the prime contractor. Protect personal and confidential information through the permitted disclosure process, but keep material conditions visible. A supplier’s promise that it can manage somehow is not a resource plan. Where state aid is relevant, the specific inquiry and proof rules need separate legal handling; evidence of public support is not automatically proof of unlawfulness.
Funding must also be available at the required time. A twelve-month surplus can coexist with an early cash deficit caused by deposits or delayed acceptance. Show a dated cash schedule and committed funding, not an expectation that another contract will arrive. If the proposed response depends on a price increase, optional purchases or extra work outside the offered scope, identify that dependency. It cannot be presented as unconditional funding for the contract already offered.
Buyer response
Answer the inquiry without replacing the offer
Use the buyer’s questions as the response order. For each, state the answer, the supporting calculation, the exhibit and any limitation. Begin with the requested price or cost component rather than a company presentation. If the buyer asks how 2,400 hours cover the required activities, an award list or a statement of experience does not answer it. Provide the activity breakdown, assumed workload and review effort that make those hours credible, or disclose that the evidence is incomplete.
An explanation should remain consistent with the submitted bargain. The Commission’s section 2 guidance makes that connection explicit. A response that quietly adds a new quantity cap, removes acceptance work or introduces an unoffered customer duty is not simply a clearer account of the original price. Whether a particular error can be corrected or a clarification is permissible depends on the procedure. Escalate it; this guide does not authorize a replacement offer.
Separate the complete internal record from the authorized disclosure package. Identify confidential supplier terms and personal data, check permissions and use the buyer’s accepted secure route. Do not assume that marking a page confidential prevents every disclosure, or redact the very condition needed to assess a saving. If the buyer needs a material document you cannot provide as requested, have the responsible reviewer resolve the disclosure route rather than substituting an unsupported assurance.
Retain the exact files sent, their approval and the portal receipt or other accepted delivery evidence. Answer follow-up questions from the same reconciled record. If a later check reveals a material error in an earlier response, preserve the history and promptly escalate how to correct it through the applicable process. A request for explanation, a requested extension and a submitted answer have different statuses; none by itself means the buyer has accepted the justification.
| Buyer concern | Evidence to attach | Decision if evidence is missing |
|---|---|---|
| Hours appear insufficient | Activity-level hours, workload and quality checks | Delivery lead confirms the gap; commercial and legal reviewers decide the response |
| Supplier rate looks unusually low | Valid quote with full scope and conditions | Purchasing verifies the commitment without inventing a retrospective agreement |
| The bidder relies on an efficiency | Comparable work records and net saving after implementation cost | Remove an unsupported claim from the explanation and assess the consequence |
| Price appears unable to fund performance | Reconciled cost and dated funding evidence | Escalate the shortfall; no automatic right to reprice or reduce work |
Release decision
Close the evidence gaps, not just the document
Give each sign-off a defined purpose. Delivery confirms the work, capacity and timing; purchasing confirms supplier conditions; finance checks the reconciliation and funding. Legal and commercial reviewers resolve the applicable procedure, any intended loss, disclosure and authority to respond. An executive signature on a generic cover letter does not replace those factual checks. The final approver needs the unresolved issues, not only a clean version with difficult lines removed.
The completed pack should let a reviewer follow one chain from the buyer’s concern to the relevant obligation, cost, explanation and exhibit. Include the offered price, the scope version, the cost bridge, supporting documents, the limitations register and the approved reply. Keep original and corrected calculations distinguishable. For a joint bid, identify which party owns each assertion and funding commitment; do not assume one member can commit another’s resources.
Stop release when a material claim is unsupported, the model omits required performance or the response would assert compliance that the evidence contradicts. “Stop” means seek the authorized decision, not unilaterally withdraw a binding offer. Before submission, a revised price or a decision not to bid may be available. After submission, correction, clarification, withdrawal and challenge options require procedure-specific advice. Preserve the deadline while obtaining that advice.
The useful outcome is a defensible explanation or an explicit decision that the current price cannot yet be defended. A low price supported by a lawful, deliverable cost advantage should be explained on its merits. A gap that remains unfunded or unproven should stay visible to the people responsible for the bid. Acceptance belongs to the buyer under the applicable rules; the evidence pack supports that assessment without predicting or guaranteeing it.
What good looks like
Useful outcomes from abnormally low tender price explanation
- The low price reconciles to an identified offer and a complete cost boundary.
- Every claimed advantage has evidence of amount, availability and scope.
- Labour, environmental and subcontracting obligations remain visible in the explanation.
- Unfunded gaps and calculation errors reach the right approvers without concealment.
- The buyer receives a supported answer to each requested point through the permitted channel.
Operating model
How to run the work
- 01
Identify the procedure and question
Confirm jurisdiction, applicable rules, offer version, requested explanations, deadline and authorized response route. Distinguish an internal warning from a formal buyer inquiry.
- 02
Reconstruct the offered cost
Trace all required work to hours, rates, purchases, overhead treatment and delivery assumptions. Reconcile the cost model to the submitted amount without overwriting the submitted file.
- 03
Prove each cost advantage
Connect claimed efficiencies to comparable activity, measured effort, rights of use, dated supplier commitments and implementation cost. Preserve missing or contrary evidence.
- 04
Check obligations and financing
Review the legal and contractual duties that affect cost, including subcontracted work. Establish how any loss or early cash requirement would be funded rather than assuming it disappears.
- 05
Approve the explanation
Have delivery confirm feasibility, finance confirm the figures and funding, and the authorized legal and commercial reviewers resolve procedural issues and disclosure limits.
- 06
Submit and preserve the record
Answer each buyer question with the relevant exhibit, follow the permitted submission route and retain receipt. Escalate any new error or changed fact; do not treat the inquiry as automatic permission to reprice.
Evaluation
Questions that change the decision
- Is the price merely different, or is there evidence of underfunded performance?
- Does the governing regime require explanation when a price appears unusually low?
- Can the claimed saving be reproduced for this exact scope?
- Are required costs or compliance obligations missing?
- Is any intended loss supported by authorized, available funding?
- Does the proposed response explain the offer or change it?
Failure modes
Where teams lose control
A percentage gap is treated as a universal legal test.
Supplier optimism replaces evidence of executable resources.
An omitted task is described as an efficiency.
A low subcontract price conceals an unresolved delivery or compliance gap.
Future change orders are assumed to repair an unviable fixed price.
A clarification response introduces a new scope, price or condition without authority.
Measurement
Measure the finished job
Measure the completed workflow, including review effort and exceptions. Output volume on its own is not evidence of a better process.
- Buyer questions answered with traceable exhibits
- Material cost items reconciled to required work
- Claimed savings lacking reproducible support
- Unfunded gaps awaiting commercial disposition
- Supplier commitments expiring before the covered service
- Explanation changes awaiting legal or disclosure approval
Questions
Common questions
Is a tender automatically abnormally low if it is twenty percent cheaper?
No universal twenty-percent rule applies across the regimes discussed here. A comparison may trigger scrutiny, but use the applicable identification and inquiry rules. The fictional twenty-percent gap in the worked case is arithmetic, not a legal threshold.
Can a low profit margin justify rejecting a tender by itself?
Do not substitute a margin percentage for the applicable legal test. Explain the complete cost basis, funding and ability to perform lawfully. A commercially approved low return does not by itself prove deliverability or oblige the buyer to accept.
Can automation explain a much lower price?
It can support an explanation if evidence shows the required work can be performed with fewer resources. Include setup, licences, review, exceptions and quality checks. A demonstration or a promised future capability does not establish the saving for the full contract.
What if a cost was omitted from the submitted price?
Preserve the submitted record, calculate the omission and escalate it to the authorized commercial and legal reviewers. Do not disguise it as a saving or assume the buyer will allow a revised price, reduced scope or later extra charges.
Does a cheap subcontractor settle the buyer’s concern?
No. Establish the subcontractor’s actual scope, available resources, price conditions and relevant compliance evidence. Explain retained responsibilities and gaps. In France, R2152-3 expressly includes the part of the contract intended for subcontracting.
Must every buyer investigate an apparently low offer?
The rule depends on the regime. Article 69 of Directive 2014/24 requires explanation when the tender appears abnormally low. Under the UK Procurement Act 2023, the current Cabinet Office guidance distinguishes discretion to investigate from the required opportunity to explain before disregard on that ground.
Does sending an evidence pack mean the price has been approved?
No. It records the bidder’s explanation and its internal approvals. Preserve proof of delivery and respond to any further lawful request. The buyer’s assessment and any challenge rights are separate procedural matters.
Sources
Primary references
- Directive 2014/24/EU, Article 69: abnormally low tenders, consolidated 1 January 2026 European Union
- 2019 procurement guidance, section 2: identifying and investigating abnormally low tenders European Commission
- VgV § 60: unusually low offers Gesetze im Internet
- Code de la commande publique, L2152-5: definition Légifrance
- Code de la commande publique, L2152-6: detection, justification and assessment Légifrance
- Code de la commande publique, R2152-3 to R2152-5: explanations and rejection Légifrance
- Assessing Competitive Tenders: section 19 guidance, updated 17 August 2026 UK Cabinet Office
About the author
Tony Kim
Tony writes about applied AI, dependable product engineering and the systems that turn complex response work into controlled delivery.
Zelius
Managed tender intelligence and bid execution for teams that want the commercial outcome.
Suppliers, founders and commercial teams pursuing public or private opportunities. Start with the workflow, constraints and evidence you already have.