Implied terms: rules and guidance

Be clear on what implied terms are in contracts and job descriptions, and understand the rules you must follow to minimise the risk of disputes and misunderstandings.

Last reviewed on 18 May 2026
School types: AllSchool phases: AllRef: 51103
Contents
  1. Implied terms are unwritten rules in a contract
  2. The implied terms in action
  3. Reasonable extra responsibilities
  4. Long-term extra responsibilities

Implied terms are unwritten rules in a contract

They can be:

  • Terms that are so obvious, they don't need to be written down (e.g. assuming that a staff member won't steal)
  • Statutory employment law requirements that can't be overridden in a contract
  • Implied through 'custom and practice' or generally regarded as 'common sense' (e.g. an expectation of the sort of behaviour that is appropriate in a school)

These impose implied duties on both sides that are assumed to be part of any employment contract. They are in place to encourage good professional relationships, helping everyone work effectively together.

Acas explains these 'implied duties' as having a mutual:

  • Duty of care
  • Duty of trust and confidence
  • Duty of fidelity

These terms apply even if a staff member isn’t working, such as when they’re off sick.

If you or your staff member breach these terms, your working relationship can be damaged