ACAS Code of Practice Compliance

Why ACAS Code compliance matters

The ACAS Code of Practice sets out minimum standards for handling workplace disciplinary and grievance procedures in the UK. It is issued by the Advisory, Conciliation and Arbitration Service (ACAS) and is widely used as the benchmark for fair employment practice in England, Wales, and Scotland.

While the ACAS Code is not legally binding in itself, employment tribunals take it into account when deciding whether an employer or employee has acted reasonably. Failure to follow the Code can lead to increased compensation awards in tribunal claims, particularly in unfair dismissal and constructive dismissal cases.

ACAS Code compliance is therefore central to employment dispute resolution, workplace fairness, and legal risk management.

What the ACAS Code of Practice covers

The ACAS Code of Practice on Disciplinary and Grievance Procedures provides guidance on how employers should manage workplace disputes.

It applies to:

• Disciplinary issues (misconduct, poor performance, breaches of policy)
• Grievances raised by employees
• Investigations into workplace complaints
• Appeals against disciplinary or grievance decisions

It sets out principles of fairness, consistency, and transparency in workplace procedures.

Legal status of the ACAS Code

The ACAS Code is not legislation, but it has legal significance under the Employment Rights Act 1996.

Employment tribunals must:

• Take the Code into account where relevant
• Adjust compensation by up to 25% if either party unreasonably fails to comply

This adjustment is known as an ACAS uplift or reduction.

Example:

• Employer fails to follow a fair disciplinary process → compensation may increase
• Employee fails to follow grievance procedures → compensation may be reduced

This makes compliance strategically important in employment litigation.

Core principles of ACAS Code compliance

1. Fairness and consistency

Employers must apply disciplinary and grievance procedures consistently across employees. Similar cases should be treated in a similar way unless there is a justified reason for difference.

2. Investigation before action

No disciplinary action should be taken without a reasonable investigation. This includes:

• Gathering relevant evidence
• Interviewing witnesses where appropriate
• Reviewing documents or records

The investigation must be impartial and proportionate.

3. Informing the employee

Employees must be told:

• The allegations or issues
• The evidence against them
• Their right to respond
• The potential consequences

This ensures procedural fairness.

4. Right to be accompanied

Employees have the statutory right to be accompanied at disciplinary and grievance hearings by:

• A trade union representative
• A workplace colleague

This is a key element of procedural fairness under employment law.

5. Opportunity to respond

Employees must be given a genuine opportunity to explain their version of events before a decision is made.

6. Right of appeal

A fair process must include the ability to appeal disciplinary or grievance decisions. Appeals should be handled impartially, ideally by someone not previously involved.

ACAS Code and disciplinary procedures

Step-by-step disciplinary process

A compliant disciplinary process typically includes:

1. Investigation of the issue
2. Notification of allegations
3. Disciplinary hearing
4. Decision based on evidence
5. Written outcome
6. Appeal process

Failure to follow these steps can render a dismissal unfair.

ACAS Code and grievance procedures

Employees raising concerns should be able to:

• Submit a written grievance
• Attend a grievance meeting
• Be accompanied
• Receive a written outcome
• Appeal if necessary

Employers are expected to address grievances promptly and fairly.

Employment tribunal role in ACAS Code compliance

Employment tribunals assess whether parties acted reasonably by reference to the ACAS Code.

They consider:

• Whether procedures were followed
• Whether investigations were adequate
• Whether decisions were proportionate
• Whether the employee was treated fairly

Tribunals also assess whether procedural failures affected the outcome.

ACAS uplift and reduction in compensation

Under the Employment Rights Act 1996, tribunals can adjust compensation by up to 25% where there is non-compliance with the Code.

Employer non-compliance

May increase compensation where:

• No proper investigation was carried out
• No disciplinary hearing was held
• No right of appeal was provided
• Bias or unfairness is shown

Employee non-compliance

May reduce compensation where:

• Internal grievance procedures were not used
• The employee failed to engage in process
• Reasonable steps were not taken before resigning

This adjustment is discretionary and depends on the facts.

Common compliance failures

Frequent employer mistakes include:

• Skipping investigation stages
• Pre-determining disciplinary outcomes
• Failing to disclose evidence to the employee
• Not allowing accompaniment
• Ignoring grievance procedures
• Inconsistent application of rules

These failures often lead to findings of unfair dismissal.

ACAS Code and constructive dismissal claims

In constructive dismissal cases, tribunals assess whether the employer fundamentally breached the employment contract and whether ACAS procedures were followed.

Non-compliance with the Code can support claims that:

• Trust and confidence was breached
• The employee was forced to resign
• Internal grievance procedures were ignored

However, resignation alone does not guarantee success.

Relationship with employment contracts and policies

Most employers incorporate ACAS principles into:

• Disciplinary policies
• Grievance procedures
• Employee handbooks

Even where not explicitly referenced, tribunals expect compliance as a baseline standard of fairness.

Time limits for tribunal claims involving ACAS Code issues

Claims involving disciplinary or grievance failures must generally be brought within:

• 3 months minus 1 day from the act complained of

ACAS Early Conciliation is mandatory before issuing a claim and pauses limitation periods.

Practical steps for employers

To ensure ACAS Code compliance, employers should:

• Maintain written disciplinary and grievance procedures
• Train managers on fair process requirements
• Conduct documented investigations
• Ensure impartial decision-making
• Provide clear written outcomes
• Offer proper appeal mechanisms
• Keep detailed records of all stages

Failure to do so increases legal and financial risk.

Practical steps for employees

Employees can strengthen their position by:

• Using internal grievance procedures
• Keeping written records of incidents
• Attending hearings and providing responses
• Requesting written reasons for decisions
• Engaging with appeal processes

These steps are often important in tribunal claims.

Frequently asked questions

Is the ACAS Code legally binding?

No, but tribunals must consider it and can adjust compensation for non-compliance.

Can failing the ACAS Code win an employment tribunal claim?

Not on its own. It supports claims but does not automatically determine liability.

How much can compensation increase?

Up to 25% uplift or reduction depending on conduct.

Does the Code apply to small employers?

Yes. It applies regardless of business size.

Key Takeaways

ACAS Code compliance is a central feature of UK employment law, guiding fair disciplinary and grievance procedures. While not legally binding, it has significant influence in employment tribunals, where non-compliance can increase or reduce compensation by up to 25%. Employers must follow fair investigation, hearing, and appeal processes, while employees are expected to engage with internal procedures. Proper compliance reduces legal risk and supports fair workplace resolution.