Unjustified Disadvantage

Unjustified disadvantage (personal grievance)

Unjustified disadvantage is one of the most common personal grievance types in New Zealand. It covers a wide range of employer actions that worsen an employee's conditions or otherwise disadvantage them.

What is unjustified disadvantage?

Under section 103(1)(b) of the Employment Relations Act 2000, a personal grievance includes a claim that the employee's employment or conditions were affected to the employee's disadvantage by some unjustifiable action by the employer.

In plain terms: if your employer does something that harms you at work (pay, duties, hours, treatment, discipline, safety, opportunities) and they cannot justify it, you may have an unjustified disadvantage grievance.

Common examples

The real battleground: was the employer action unjustifiable?

Most unjustified disadvantage disputes are not about whether the employee was unhappy. They turn on whether the employer's action (and the process used) was fair and reasonable in the circumstances.

• Evidence and reasons: what was the employer trying to achieve, and what evidence supported it?
• Process: was the employee told what the issue was, given information, and allowed a meaningful chance to respond?
• Consistency: was the employee treated consistently with policy, past practice, and comparable employees?
• Proportionality: was the response proportionate to the issue, or was it overreach?

A practical warning: where the dispute is really about interpreting a clause in the employment agreement, it may be treated as an interpretation dispute rather than an unjustified disadvantage claim. The framing matters.

Time limits: usually 90 days

For most personal grievances, you generally must raise the grievance with the employer within 90 days of the action happening or coming to your notice (whichever is later). There are limited pathways for late grievances, but do not rely on them.

Evidence that usually matters

• The employment agreement, job description, and any variation letters.
• The key emails/letters (allegations, meeting invites, warnings, outcome letters, restructure proposals).
• Your timeline (5 to 10 bullets in order, with dates).
• Any policy documents relied on (conduct, discipline, bullying/harassment, performance, IT, privacy).
• Notes of meetings, witness names, and any supporting documents (rosters, pay slips, screenshots).

Outcomes and remedies (what can be on the table)

Many unjustified disadvantage disputes resolve by agreement (often at MBIE mediation). Depending on the facts, outcomes can include changes to the employer record, compensation, and practical fixes.

• Removing or correcting warnings, allegations, or outcome letters.
• Backpay or reimbursement where the disadvantage caused loss.
• Compensation for humiliation, loss of dignity, or injury to feelings (fact-dependent).
• Clarifying duties, reporting lines, and future process to prevent repeat disputes.
• Settlement terms including confidentiality, references, and clean exit arrangements where appropriate.

If you are an employer

Unjustified disadvantage claims are often a process audit. If you are responding as an employer, focus on the record and keep the process tight.

• Do not react: stabilise, gather the documents, and identify the decision-maker.
• Check time limits: confirm whether the PG was raised within time and avoid accidental waiver.
• Respond to the substance: what was done, why it was done, and what process was followed.
• Fix defects early: if something was mishandled, a practical remedy early can prevent escalation.