Why is ACAS Code Critical for HR in 2026 

The ACAS Code of Practice on disciplinary and grievance procedures is one of the most influential frameworks in UK employment relations. For HR managers, it is not simply guidance. It is a standard that shapes how organisations handle employee complaints and disciplinary matters, and it carries significant weight in employment tribunals. 

What the ACAS Code is 

ACAS, the Advisory, Conciliation and Arbitration Service, developed the Code to provide clear steps for managing workplace disputes. It is not legislation, but tribunals use it as a benchmark when deciding whether an employer acted fairly. If the Code has not been followed, compensation awards can be increased by up to 25 percent. That makes it a cornerstone of HR compliance in the UK. 

The Code applies to both disciplinary issues and grievances. It sets out the minimum standards expected of employers, ensuring that employees are treated consistently and that organisations can demonstrate fairness in their processes. 

Key principles for grievance handling 

The Code outlines practical steps that every HR manager should apply: 

• Employees should raise grievances in writing to create a clear record. 

• Managers must arrange meetings to discuss the grievance in detail.

• Employees have the right to be accompanied by a colleague or trade union representative. 

• Investigations must be thorough, with evidence gathered and witnesses interviewed. 

• HR must confirm outcome decisions in writing and explain the right of appeal.

These principles are designed to protect both employer and employee, and they provide a framework that stands up to scrutiny. 

The HR manager’s role in applying ACAS Code 

HR managers are often the ones guiding line managers through grievance procedures. This means setting timelines, structuring investigations, and reviewing outcome letters. Nathan Andrews, Head of HR Services at Fretton’s Solicitors, spoke at our recent Virtual Boardroom about the risks of overlooking key steps. He explained,  

“Failure to follow the code of practice on disciplinary grievance procedures could result in the employment tribunal increasing any compensation award by up to 25%.” 

Nathan added that he has seen organisations forget to include the right of appeal in outcome letters, which can lead to claims of unfair treatment. His advice was clear: every stage of the process must be handled with consistency and attention to detail. 

Why ACAS Code strengthens workplace culture 

Following the ACAS Code is not only about avoiding tribunal penalties. It shows employees that the organisation takes their concerns seriously and treats them fairly. This builds trust, reduces workplace conflict, and strengthens employee engagement. For HR leaders, applying the Code consistently is part of creating a culture of transparency and accountability. 

In Summary 

The ACAS Code of Practice is more than a checklist. It is a framework that protects both employer and employee. For HR managers, applying the Code consistently reduces risk, strengthens workplace culture, and demonstrates that fairness is embedded in the organisation’s approach to employee relations.