Debarment and the debarment list: what suppliers need to know

Most suppliers will never go near the debarment list, and that is worth saying at the outset. The exclusions regime is aimed at serious misconduct: fraud, bribery, cartels, modern slavery, repeated failure to deliver. But every bidder is asked to declare against it, and a misstep in that declaration, or a problem sitting quietly in a subcontractor or a director's history, can cost you a contract you would otherwise have won. Understanding how the regime works is part of running a credible bid function, not a sign that anything is wrong.

The Procurement Act 2023, in force since 24 February 2025, tightened the rules and, for the first time, created a central list. This guide explains the two distinct mechanisms, the grounds behind them, who runs the list, and what you can do about it.

Exclusion and debarment are not the same thing

The two words are often used loosely, but the Act treats them as separate tools, and the difference matters.

Exclusion happens inside a single procurement. A contracting authority assesses each bidder against the grounds in the Act and decides whether that supplier can take part in this competition. If a ground applies, the authority excludes the bidder from that procurement only. The decision sits with the buyer, on that occasion, on those facts.

Debarment is central and general. A Minister of the Crown can place a supplier on a single published list that every contracting authority must check. Being on the list for a mandatory ground means you are excluded from covered procurements across the public sector, not just one. Debarment does not replace the buyer-level assessment; it sits above it, so a supplier can be excluded from a procurement without being debarred, and debarment is the more serious, system-wide step.

A useful way to hold it: exclusion is a decision about you by one buyer for one contract; debarment is a decision about you by a Minister that follows you everywhere.

Mandatory and discretionary grounds

The Act sorts the grounds into two schedules, and the label controls how much room a buyer has.

Mandatory grounds (Schedule 6) cover the most serious matters: terrorism, bribery, fraud, money laundering, certain slavery and human trafficking offences, organised crime, and cartel activity such as bid-rigging, price-fixing or sharing markets. Serious tax offences and abusive tax arrangements are included, as are national security grounds. Where a mandatory ground applies and the supplier is an "excluded supplier", the buyer must exclude them, subject to narrow exceptions. Convictions and conduct generally stop counting after five years.

Discretionary grounds (Schedule 7) are broader and more common in practice: insolvency or financial failure, professional misconduct, breach of a previous public contract, poor performance, environmental or labour-law misconduct, acting improperly in a procurement (for example providing misleading information), and equivalent misconduct that happened outside the UK. Where a discretionary ground applies and the underlying problem is continuing or likely to recur, the supplier becomes an "excludable supplier". The buyer may then exclude them, but is not obliged to, and can decide to proceed after due diligence if there is good reason.

Two points that catch suppliers out. First, the grounds reach beyond the bidding entity itself: they can take in "connected persons" such as directors and parent companies, and "associated persons" such as key subcontractors you are relying on to meet the requirement. A clean main contractor can still be caught by a problem in a named subcontractor. Second, poor performance now has teeth. Contract-performance information is more visible under the Act, so a history of failing to deliver can follow you into later competitions.

The debarment list and who maintains it

The debarment list is a single document published on gov.uk that names suppliers who are excluded or excludable from public procurement. Any contracting authority running a covered procurement must check it.

Only a Minister of the Crown can add a supplier to the list, and only after a formal investigation in which the supplier is notified and given the chance to respond. The investigative work is carried out on the Minister's behalf by the Debarment Review Service (DRS), which from 1 April 2026 sits within the Government Commercial Agency. National security cases are handled separately by the National Security Unit for Procurement, based within the Cabinet Office. The DRS assesses referrals, investigates, and recommends; the Minister makes the final decision.

An entry records whether the supplier is listed on a mandatory ground (which means mandatory exclusion everywhere) or a discretionary ground (which makes the supplier excludable, so buyers retain a discretion). A supplier generally stays on the list for up to five years, measured from when the relevant event occurred for mandatory grounds, or from when the Minister became aware of it for discretionary ones. A listed supplier can apply for removal if there is significant new information or a material change of circumstances, and can appeal a listing to the court, though only on the basis that the Minister made a material mistake of law, and generally within 30 days.

The list is short. Its purpose is deterrence and transparency as much as sanction, and the vast majority of suppliers will only ever encounter it as a box to check.

Self-cleaning: showing you have put things right

The regime is not designed to end a business for a past mistake. "Self-cleaning" is the mechanism that lets a supplier show a ground no longer bites because the problem has been fixed and is unlikely to happen again.

When a ground potentially applies, you can put forward evidence that you have taken it seriously and remediated it. The factors a buyer or Minister will weigh include:

• Paying compensation or making good any harm caused.
• Cooperating with investigators or regulators.
• Replacing the individuals responsible, or changing the management involved.
• Putting concrete measures in place to stop it recurring: new controls, training, policies, audits, and independent oversight where the matter is serious.
• Evidence that the changes are real and embedded, not paper commitments.

Strong self-cleaning evidence can persuade a buyer not to exclude you, and can persuade a Minister not to add you to the list in the first place, or to remove you sooner. The key is to be ready with it: a supplier who can produce a clear, documented account of what went wrong and what changed is in a far stronger position than one improvising under a tender deadline.

Practical steps to reduce your exclusion risk

Most of the risk is managed by good housekeeping, done before a tender appears rather than during one.

• Know your own position on both schedules. Review Schedule 6 and Schedule 7 against your business, your directors, your parent or group companies, and the subcontractors you routinely rely on. Do not answer a declaration you have not actually checked.
• Declare accurately, every time. The fastest route onto the wrong side of the regime is a false or misleading declaration, which is itself a discretionary ground. If something applies, disclose it and pair it with your self-cleaning evidence.
• Keep a live self-cleaning file. Where any issue exists, document the facts, the remediation, and the proof it worked, and keep it current. You want to attach it, not write it, when a selection questionnaire asks.
• Manage your supply chain. Check key subcontractors against the same grounds and check the debarment list before you name a partner in a bid. A debarred subcontractor can sink an otherwise compliant tender.
• Deliver well on the contracts you hold. Published performance information travels now. Meeting your KPIs is not just this contract's problem; it protects your standing in the next competition.

Handled sensibly, the exclusions and debarment regime is not something to fear. It rewards the same discipline that wins bids: know your own position, tell the truth about it, keep your evidence in order, and deliver what you promised. Do that, and the debarment list stays what it should be for almost every supplier, a page you glance at when checking a subcontractor, and never a page with your name on it.