EU Abnormally Low Tenders: Rules, Rejection Process and Article 69 Explained

Definition: What Is an Abnormally Low Tender?

The abnormally low tender rules are one of those areas that procurement lawyers love and suppliers hate — but understanding them properly is a genuine competitive advantage. An abnormally low tender (ALT) is a bid whose price or costs appear so unusually low relative to the works, supplies, or services to be provided that the contracting authority is concerned the contract simply cannot be delivered properly at that price. Maybe the bidder miscalculated. Maybe they plan to cut corners. Maybe they're expecting to claw back money through contract amendments. Or maybe they've achieved the low price through something outright impermissible — illegal state subsidies, underpaid workers, predatory dumping.

Here's what EU law does not do: it doesn't define "abnormally low" with a fixed formula or a specific percentage. Member states may establish indicative thresholds in national law — a bid more than 15% below the next-lowest tender, or more than 20% below the average of all tenders received, are common informal benchmarks — but these are guidance only. The European Commission and the CJEU have consistently said that automatic rejection based solely on mathematics, without the mandatory clarification procedure, violates Article 69. The contracting authority's professional judgement, informed by market knowledge and the specific contract requirements, is what actually counts.

In practice, this means a buyer who has run similar procurements for years and knows what a realistic price looks like has real discretion to flag a bid that's technically within the informal threshold but still looks wrong. And conversely, a bidder with a genuinely superior cost model who comes in 30% below everyone else has the legal right to explain themselves — they cannot be rejected without that chance.

Article 69 Directive 2014/24/EU: The Legal Framework

Article 69 of Directive 2014/24/EU sets the complete EU legal framework for abnormally low tenders. For utilities procurement, the equivalent is Article 84 of Directive 2014/25/EU. The text is worth reading carefully — it's more nuanced than most summaries suggest.

Article 69(1) says contracting authorities "shall require" tenderers to explain prices that seem abnormally low. "Shall require" — not "may" — once the authority identifies a potential ALT, requesting an explanation isn't optional.

Article 69(2) lists what those explanations may relate to: the economics of the manufacturing process or construction method; technical solutions chosen or exceptionally favourable conditions available to the tenderer; the originality of what's being proposed; compliance with obligations under Article 18(2) (environmental, social, and labour law); compliance with subcontracting rules; or the possibility of state aid.

Article 69(3) is where buyers often get into trouble. The authority must genuinely assess the information provided — consulting the tenderer where needed — and can only reject where the evidence doesn't satisfactorily account for the low price. A perfunctory review that ignores the substance of what the tenderer said is legally vulnerable.

Article 69(4) is the mandatory rejection ground: where a tender is abnormally low because it doesn't comply with environmental, social, or labour law obligations under Article 18(2), the authority shall reject it. Not may — shall.

Article 69(5) covers state aid specifically: where the low price is due to state aid, rejection is permitted only after consulting the tenderer and giving them a sufficient time limit to prove the aid was legally granted. If they can prove it, rejection on those grounds alone isn't available.

The Mandatory Clarification Procedure

The procedure under Article 69 is sequential. You can't skip steps. Most successful legal challenges to ALT rejections succeed precisely because a contracting authority rushed this process or treated it as a box-ticking exercise rather than a genuine assessment.

Step 1 — Identification: The authority identifies a tender as potentially abnormally low. This might come from mathematical comparison, professional judgement, concern about specific cost elements, or information received from elsewhere. Whatever triggers it, the internal identification should be documented.

Step 2 — Written request for explanations: A written request goes to the tenderer asking it to explain the price or costs. Here's something many authorities get wrong: a vague request ("please explain your low price") is far less defensible than a targeted one ("please explain how you propose to deliver 40,000 hours of professional services at €X/hour, which is significantly below the market rate for equivalent professionals"). Specificity protects the authority legally and gets better information from the tenderer. The tenderer must get a reasonable time to respond — typically 5–15 working days depending on complexity. In practice, for complex bids, 5 days is often genuinely insufficient.

Step 3 — Assessment of explanations: The authority must genuinely assess what's been submitted, with reference to the Article 69(2) elements. This assessment must be documented. If the tenderer explains economies of scale and the authority dismisses this without engaging with the substance, that dismissal will be hard to defend if challenged.

Step 4 — Decision: Based on the assessed explanations, the authority either accepts the tender, accepts it with additional contractual safeguards, or rejects it on documented grounds. The rejection must be communicated with reasons — the tenderer needs enough information to understand why, and to mount a potential legal challenge if they believe the assessment was flawed.

Valid Justifications for Low Prices

Article 69(2) lists the types of explanation that can justify a low tender price. The honest answer is that the most effective justifications are specific, documented, and verifiable — not assertions, but evidence. Evaluators are trained to be sceptical, and rightly so.

Innovative production or delivery method: A genuinely novel technical approach that reduces delivery cost compared to conventional methods — automation, AI-assisted service delivery, proprietary technology, optimised logistics. You'll need more than a claim of innovation. You need to explain the method, quantify the cost advantage, and ideally point to comparable deployments that demonstrate it works at the cost you're asserting.

Exceptionally favourable supply chain conditions: Existing contracted supply chain rates significantly below market — bulk supply agreements, long-term relationships, preferential pricing through group purchasing. The evidence here is concrete: supplier contracts, price lists, framework agreements. "We have good supplier relationships" is not sufficient. The specific contracted rate is what counts.

Economies of scale from existing operations: If you already operate comparable services in the same area or sector and can add this contract at marginal cost — sharing staff, equipment, management overhead, depot facilities — genuine efficiencies exist. You need to describe the existing operations, explain how overhead is allocated, and quantify the marginal cost economics. Vague assertions about economies of scale without the operational detail behind them won't hold up.

Originality or uniqueness of the proposed solution: A technically superior or uniquely efficient solution can deliver the same outcome at lower cost than conventional approaches. This is distinct from the innovative production method — it's about the originality of the solution itself rather than the process for producing it.

Genuinely low overhead or margin: A lean organisation with low fixed costs, or a company accepting lower margin for strategic reasons (market entry, reference site, sector expansion), may legitimately offer lower prices than competitors. The evidence is the company's cost structure — overhead rates, margin expectations, compared to industry norms. This is harder to sustain for large established suppliers, but for newer or niche operators it can be credible.

Grounds for Rejection

Following the mandatory clarification procedure, a contracting authority may reject on specific grounds. Note the word "may" for most of these — only the labour law non-compliance ground creates a mandatory rejection obligation.

Failure to provide explanations: If the tenderer doesn't respond within the specified time, or provides no substantive explanation, rejection is available. This is the clearest rejection ground legally — it's hard to mount a successful challenge when you simply didn't engage with the process.

Explanations insufficient: The authority must document specifically why each explanation was insufficient — not just a general finding of inadequacy. This is the most contested ground and the one where legal challenges most often succeed. "We were not satisfied with the response" without reference to specific deficiencies in the substance of what was provided is exactly the kind of assessment that gets overturned.

Non-compliance with labour, social, or environmental law (Article 69(4)): Where the low price results from non-compliance with applicable labour law — minimum wage, working time, health and safety — environmental law, or social law obligations, rejection is mandatory. The authority must identify the specific legal obligation and document how non-compliance is established. This isn't a suspicion; it needs to be grounded.

Illegal state aid (Article 69(5)): Where the tender is abnormally low due to state aid, rejection is permitted — not mandatory — if the tenderer cannot demonstrate the aid was legally granted under EU state aid rules. More on this below.

State Aid as a Rejection Ground

State aid — financial advantages granted by a public authority to specific companies that distort competition — can enable a recipient to submit artificially low tender prices that are only commercially viable because of the subsidy, not genuine cost efficiency. Article 69(5) addresses this, but the procedure is more cautious than many buyers realise.

The sequence: the authority identifies that the tender may be abnormally low due to state aid; it consults the tenderer and asks them to explain the aid and demonstrate it was legally granted; if the tenderer proves the aid was legally notified to the European Commission and approved under EU state aid rules, the tender may not be rejected solely on state aid grounds; if they can't prove legal granting within the time allowed, rejection is available.

In practice, Article 69(5) comes up most often in cross-border procurement — publicly subsidised entities from one member state bidding in another's procurements. It's been used in defence, transport, and energy procurement, where state-owned enterprises or heavily subsidised national champions can price below market because the government is effectively underwriting their cost base. The interaction between Article 69(5) and EU state aid enforcement under Article 108 TFEU is genuinely complex. If you're a contracting authority facing a plausible state aid concern, get legal and state aid specialist input before making a rejection decision — this is an area where the wrong call is expensive.

Minimum Wage and Labour Law Compliance

For labour-intensive services — cleaning, security, catering, maintenance, IT staffing — Article 69(4) is where most of the action is. A bid priced below the cost of delivering the service with workers paid at the applicable minimum wage necessarily implies non-compliance with labour law. That's arithmetic, not procurement judgement. Contracting authorities in labour-intensive service procurement increasingly calculate a minimum viable tender price based on staff hours required at minimum wage plus statutory employer costs, and use this as an informal ALT floor.

This varies across the EU, and the variation matters enormously. National minimum wage levels range from under €5/hour in some Eastern European states to over €15/hour in Luxembourg and the Netherlands. EU Posted Workers Directive 2018/957/EU (the revision of 96/71/EC) requires that workers posted to perform services in another member state receive the host country's minimum wage and working conditions. In practice, this limits the ability of suppliers from lower-wage member states to price contracts based on home-country labour costs when the work is actually performed in a higher-wage country.

The EU Adequate Minimum Wages Directive 2022/2041/EU, which entered into force in November 2022 with a transposition deadline of November 2024, further harmonises minimum wage standards by requiring member states to ensure their minimum wages meet adequacy criteria — at least 60% of gross median wage. This raises minimum wage floors in several EU member states and has direct implications for ALT analysis in labour-intensive categories. If you're bidding cleaning contracts across multiple EU markets, you need country-specific minimum wage data built into your cost models. This isn't optional — it's the legal floor.

CJEU Case Law

The Court of Justice of the EU has developed a substantial body of case law on abnormally low tenders. The consistent message: the clarification procedure is mandatory, not procedural decoration, and arbitrary rejection — whether from pre-determination or from mechanical application of mathematical thresholds — violates EU law.

Case C-599/10, SAG ELV Slovensko: The CJEU held that the obligation to request explanations before rejecting an abnormally low tender is a general principle of EU procurement law. Not a formality. Not a step that can be compressed into a rubber stamp. The authority must genuinely assess the explanations received, and rejection without adequate assessment violates EU law. This case is the foundational authority — cite it if you're challenging a hasty ALT rejection.

Case C-94/12, Swm Costruzioni 2: Contracting authorities have a wide margin of discretion in assessing explanations for an abnormally low tender, but this discretion must be exercised in accordance with the principles of equal treatment and transparency. Automatic application of a mathematical formula cannot substitute for genuine assessment. Wide discretion doesn't mean unlimited discretion.

Case C-76/16, INGSTEEL and Metrostav: Even where a mathematical comparison is stark — the price is obviously well below everyone else — the authority still may not reject without following the full clarification procedure. The procedure is mandatory regardless of how clearly abnormal the price appears. There are no shortcuts, however obvious the answer seems.

Beyond CJEU, national procurement review bodies — administrative courts, procurement supervisory authorities — have developed extensive case law interpreting Article 69 in their specific legal contexts. If you're preparing an ALT challenge response, reviewing relevant national case law in the specific jurisdiction is as important as knowing the CJEU precedents.

What Bidders Should Do When Challenged

Most suppliers get this wrong: they wait for the ALT challenge letter and then try to construct a justification retrospectively. That's the wrong approach. Preparation before submitting a genuinely low tender is the most effective strategy.

Maintain a detailed cost model. Every element of the tendered price should be traceable to a cost component: labour hours at specific rates, materials at specific prices, overhead allocation at a documented rate, and margin. This cost model should be complete enough to extract and present as documentary evidence in an explanation response. Pricing assembled by judgement or comparison without a granular cost model is genuinely difficult to defend under ALT challenge — and evaluators know the difference between a cost model and a post-hoc rationalisation.

Document supply chain pricing advantages in advance. If the low price relies on favourable supplier rates, document those rates before you submit — supplier quotes, framework agreement prices, long-term supply contracts. When challenged, you need to produce evidence quickly. Trying to reconstruct cost justifications after the fact is less persuasive and may be treated as fabricated, particularly if the documentation appears to have been created after the clarification request arrived.

Respond comprehensively and promptly. When the clarification request arrives, respond within the time specified — or request an extension before the deadline if you genuinely need more time. The response should address every element identified in the request, with supporting documentation for each. A partial response that answers some concerns but not others will typically result in rejection on the unaddressed points. Evaluators are not obliged to fill gaps you leave.

Engage procurement legal counsel for high-value contracts. For contracts where an ALT rejection would be commercially significant, specialist procurement lawyers reviewing the clarification request and helping draft the explanation response is money well spent. The legal standard of the response matters in any subsequent challenge to a rejection decision. A response drafted with legal awareness reads differently from one that isn't.

Abnormally Low Tenders by Sector

IT outsourcing and software development: Highly variable cost structures create frequent ALT situations in this sector. Offshore delivery models, automation, or the use of existing software platforms can legitimately support pricing well below market day rates for EU-based developers. ALT challenges in IT procurement typically focus on whether the staffing model — mix of onshore/offshore resources, junior/senior ratios — is compatible with the specification requirements and quality commitments in the bid. If you're pricing a development contract around an offshore team, be specific about who does what and at what rate. "Offshore delivery" without a credible resource plan won't survive scrutiny.

Cleaning and security services: Labour cost floors create the most objective ALT calculations in these sectors. Any bid priced below the minimum wage cost of delivering the required hours of service is arithmetically impossible to explain legitimately — you can't deliver 10,000 hours of cleaning in a month with workers paid less than the legal minimum. ALT challenges in cleaning and security almost always focus on wage compliance, making Article 69(4) the relevant rejection ground for genuinely non-compliant low bids. The calculation is simple; the enforcement is what varies by jurisdiction.

Construction: Material cost and labour cost variation create ALT situations frequently, particularly when commodity prices change rapidly between tender preparation and submission. ALT challenges in construction require detailed cost breakdowns showing material quantities, unit prices, and labour composition. Major infrastructure contracts routinely trigger ALT scrutiny given their complexity and the sector's persistent history of post-award cost overruns — procurement officers know the pattern and they're watching for it.

Frequently Asked Questions

What is an abnormally low tender under EU procurement law?

An abnormally low tender is a bid where the price appears so unusually low relative to the contract scope that the contracting authority questions whether it can be properly performed. There's no fixed percentage threshold — Article 69 of Directive 2014/24/EU gives contracting authorities discretion to identify ALTs based on professional judgement. Common informal triggers: a bid 20–30% below the average of other tenders received, or below the authority's independent estimate, or below the minimum wage cost of the labour required for the contract.

Can a contracting authority automatically reject an abnormally low tender?

No. Under Article 69, the authority MUST request written explanations from the tenderer before any rejection. This is mandatory, not discretionary. Automatic rejection based solely on a mathematical threshold violates EU law and is challengeable — the CJEU has said so repeatedly. The only narrow exception is where non-compliance with labour/social/environmental law under Article 69(4) is established, but even that requires documented assessment of the specific non-compliance, not a general assumption.

What should a supplier do if challenged on an abnormally low tender?

Respond promptly, comprehensively, and with documentary evidence. Provide a detailed cost breakdown showing each element of the price; evidence of favourable supply chain pricing (supplier contracts, framework rates); documentation of innovative methods reducing costs; evidence of economies of scale from existing operations. Vague reassertions that the price is correct without evidence will result in rejection. The best preparation is maintaining a granular cost model before submission that can be extracted as supporting documentation the moment a clarification request arrives.