Collective consultation duties in the United Kingdom
Reviewed by Mellow Editorial Team, HR & payroll content team
Collective consultation duties in the UK apply when an employer proposes to make 20 or more employees redundant at one establishment within a period of 90 days or less. In those circumstances, the law sets minimum timescales and procedural requirements that must be followed before any dismissals take effect.
When collective consultation is triggered
The duty arises under the Trade Union and Labour Relations (Consolidation) Act 1992 (TULRCA), as amended. The key threshold is 20 proposed redundancies at one establishment within 90 days. If you are proposing 100 or more redundancies, the minimum consultation period is longer.
The word "propose" matters here. The obligation begins when redundancies are genuinely under consideration — not once decisions are already made. Consulting after the fact defeats the legal purpose and is a common source of tribunal claims.
"Establishment" is interpreted broadly by tribunals and has been the subject of significant case law. As a rule of thumb, treat it as the distinct unit or site where the affected employees are based, but take advice if your organisation has an unusual structure.
Minimum consultation periods
- 20 to 99 proposed redundancies: consultation must begin at least 30 days before the first dismissal takes effect.
- 100 or more proposed redundancies: consultation must begin at least 45 days before the first dismissal takes effect.
These are minimums, not targets. Meaningful consultation generally takes longer, and tribunals scrutinise whether the process was genuine rather than a rubber-stamping exercise.
Who you must consult
Collective consultation is conducted with appropriate representatives, not with each employee individually. There are two routes:
1. Trade union representatives, if a recognised trade union covers the affected employees.
2. Elected employee representatives, where there is no recognised union or the union does not cover the affected group.
If no representatives are in place, you are required to arrange elections before consultation can begin. That election process takes time, so factor it into your overall timeline.
You must also notify the Secretary of State by submitting a HR1 form to the Redundancy Payments Service before consultation starts — at least 30 days before the first dismissal where 20 to 99 redundancies are proposed, or 45 days for 100 or more. Failure to notify is a criminal offence, separate from any employment tribunal liability.
What the consultation must cover
TULRCA sets out specific information that must be disclosed to representatives in writing. This includes:
- The reasons for the proposed redundancies
- The numbers and descriptions of employees affected
- The proposed selection method
- The procedure and timetable
- How redundancy pay will be calculated
The consultation itself must be undertaken with a view to reaching agreement. That does not mean you must agree to every counter-proposal, but you must genuinely consider alternatives — such as reduced hours, redeployment, voluntary redundancy, or changes to selection criteria — before proceeding. Representatives should have adequate time and access to the information they need to engage meaningfully.
Consequences of getting it wrong
Where an employer fails to comply with collective consultation obligations, an employment tribunal can award a protective award to each affected employee. This can be up to 90 days' gross pay per employee — uncapped — and applies to every employee who should have been consulted, not just those who bring a claim. In a large redundancy exercise, the financial exposure is significant.
The Employment Rights Act 2025 has strengthened several day-one employment rights more broadly, and the regulatory environment for employment disputes is tightening. Procedural shortcuts that might once have been treated leniently carry greater risk now.
Failure to submit the HR1 form on time can result in a fine. These two obligations — the tribunal route and the criminal route — are independent of each other, so both can apply simultaneously.
Practical steps for employers
Before you begin any restructuring that could reach the 20-redundancy threshold, it is worth taking the following steps:
- Map your timeline early. Work backwards from your target date and build in the minimum consultation period plus time for elections if needed.
- Identify the correct representatives. Check whether a recognised union exists for the relevant group before assuming you need to run elections.
- Submit the HR1 promptly. Do this at the same time you notify representatives — do not wait until consultation is under way.
- Document everything. Keep records of all meetings, proposals put forward by representatives, and your responses. This is your evidence if a tribunal claim is made.
- Take legal advice early. Collective consultation law has layers of case law attached to it. Advice at the planning stage is far less costly than defending a protective award claim.
Collective consultation is not just a procedural formality. Employees who are facing redundancy have a legal right to a genuine process, and tribunals are experienced at distinguishing real engagement from going through the motions.
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