Unilateral Contract Changes Under the Employment Rights Act 2027: What Employers and Workers Need to Know
Starting 1 January 2027, the Employment Rights Act imposes strict limits on unilateral changes to employment contracts. Employers can no longer impose certain variations--such as reductions in pay or time off, pension changes, or alterations to working hours or shifts--without risking automatically unfair dismissals. These rules target practices like fire-and-rehire, where dismissal follows an employee's refusal to accept imposed changes.
For UK employers, this means planning contract reviews and lawful variation methods now to ensure business flexibility. Job seekers gain stronger protections against unfair unilateral impositions during hiring or ongoing employment. A consultation period on these changes runs until 1 April 2026, offering a window for input.
These updates, drawn from analyses by DLA Piper and Clarkslegal, help both sides navigate compliance and rights under the new framework.
What Makes a Contract Change 'Unilateral' vs Bilateral?
A unilateral contract change occurs when an employer imposes new terms without the employee's explicit agreement. Acceptance may happen implicitly if the employee continues working under the new terms without objection, but this carries risks of breaching the original contract.
In contrast, a bilateral change requires mutual agreement between employer and employee. Both parties must consent to the variation, often through signed updates or addendums, ensuring the contract remains valid.
The key differences lie in agreement and risk. Unilateral imposition skips negotiation, potentially leading to disputes or claims of breach, especially post-2027 under ERA rules. Bilateral methods build consensus, reducing legal exposure. As outlined in resources like Sprintlaw UK, unilateral changes depend on performance-based acceptance, which rarely justifies imposition without waiver of objection in employment contexts. Employers face heightened risks with unilateral approaches, as continued performance by the employee does not always equate to full waiver of rights, particularly for significant terms like pay or hours.
ERA Restrictions on Unilateral Contract Changes
Effective 1 January 2027, the Employment Rights Act restricts unilateral changes by making dismissals automatically unfair if used to enforce 'restricted contract variations'. These include:
- Reductions in pay or time off
- Changes to pension terms
- Alterations to working hours or shifts
If an employee refuses such a variation and faces dismissal, it qualifies as automatically unfair, strengthening worker protections. This closes loopholes previously exploited via fire-and-rehire tactics.
Employers must note the consultation deadline of 1 April 2026 for feedback on these provisions. Until then, current rules apply, but preparation aligns with the incoming limits. DLA Piper highlights the need for compliance planning to avoid these pitfalls. These restrictions apply specifically to the listed variations, ensuring employers cannot rely on dismissal as a tool to force acceptance without facing automatic unfair dismissal claims.
How Employers Can Legally Change Contracts (Pre- and Post-ERA)
Employers have three established methods to effect contract changes, though details vary by situation. Unilateral imposition remains rarely viable, as it breaches contracts unless the change takes immediate effect and the employee continues without objection.
Pre-2027, review contracts to embed flexibility, such as lawful variation clauses allowing updates to standard terms. Use addendums for mid-term amendments rather than full rewrites, ensuring terms are transparent, not misleading, and fair under the Consumer Rights Act 2015.
Post-ERA, prioritise agreement-based approaches to sidestep restrictions on unilateral actions. Avoid fire-and-rehire, focusing on consultation and mutual consent. Clarkslegal advises acting before 1 January 2027 to build in mechanisms like variation clauses, supporting smooth adaptations. By incorporating these lawful variation mechanisms now, employers can update standard terms more effectively while maintaining compliance with both current practices and the upcoming ERA limits.
Guidance for Employers vs Job Seekers on Unilateral Changes
Employers should review contracts immediately for flexibility, even without fire-and-rehire plans. Incorporate lawful variation mechanisms, engage in consultations until 1 April 2026, and use addendums for changes. This prepares for ERA rules while minimising dispute risks. Reviewing contracts now ensures terms meet business needs and include flexibility before 1 January 2027, as recommended by DLA Piper.
Job seekers benefit from implicit protections against unfair dismissals tied to restricted variations. During negotiations, insist on bilateral agreement for key terms like pay or hours to safeguard rights. Documenting proposed changes in writing helps confirm explicit agreement and avoids implied acceptance risks.
The table below compares unilateral and bilateral approaches:
| Aspect | Unilateral Change | Bilateral Change |
|---|---|---|
| Agreement Needed | None; imposed by employer | Mutual consent required |
| Acceptance Method | Often via continued performance | Explicit agreement (e.g., signed addendum) |
| Risks for Employers | High (breach, unfair dismissal post-2027) | Low (consensus reduces disputes) |
| ERA Impact | Restricted variations trigger auto-unfair | Compliant with new rules |
| Suitability | Rarely viable without objection waiver | Preferred for pay, hours, pensions |
FAQ
What are restricted contract changes under the Employment Rights Act?
Restricted changes include reductions in pay or time off, pension alterations, and modifications to working hours or shifts. Dismissals to enforce these become automatically unfair from 1 January 2027.
When does the ERA ban on unfair unilateral changes take effect?
The restrictions take effect on 1 January 2027.
Can employers still make unilateral changes after 1 January 2027?
Unilateral imposition risks breaching contracts and triggering automatically unfair dismissals for restricted variations, making it rarely viable.
What should employers do to review contracts before 2027?
Review contracts now to ensure flexibility, add lawful variation clauses, and use addendums for amendments, preparing for ERA limits without relying on fire-and-rehire.
How does continuing work after a unilateral change affect my rights?
Continued performance may imply acceptance, but it does not waive rights against breaches or unfair dismissals under ERA for restricted variations.
What is the consultation deadline for ERA contract change rules?
The consultation runs until 1 April 2026.
For next steps, employers can start contract audits using the referenced guides, while job seekers should document any proposed changes in writing to confirm agreement.