Can AI change the terms of your employment contract?

A care home’s rota app moves you to nights. A warehouse message announces a lower hourly rate. Your manager says the system decided. Your employer still has to answer for it. AI gives them no extra right to change your contract, and a message on your phone does not settle what you have agreed.

AI does not give your employer new powers

Acas says contract changes must be agreed. Agreement may already exist in a valid flexibility clause or come through an authorised collective agreement. Without a lawful contractual basis, imposing worse terms is usually a breach. A pay shortfall may also be an unlawful deduction.

Introducing AI does not always change a term. Asking a warehouse picker to use a scanner for existing duties may be an instruction within the contract. Cutting guaranteed hours or an agreed rate is different. Predictions about job redesign do not answer whether either change is lawful.

If a particular covered by your written statement changes, your employer must record it in writing at the earliest opportunity and within one month. Section 4 of the Employment Rights Act 1996 covers workers and employees. The statement records a change; it does not validate it.

What counts as agreement

Agreement can be written, spoken or inferred from conduct. Carrying on without objecting may support your employer’s argument that you accepted new terms. A chatbot cannot establish consent simply by declaring that silence counts. Do not leave that argument unanswered.

If you disagree, object before the change starts if possible:

1. Ask what is changing. Request the terms, start date, reason and clause your employer relies on.
2. Object in writing. You can write: “The proposed change to pay and hours is not agreed. Any work under these terms is under protest and all rights are reserved.” Adapt this to your dispute and keep a copy.
3. Save the evidence. Keep lawful copies of contracts, rotas, messages, payslips and dismissal threats somewhere you can access without your work account.
4. Contact your union or Acas. Ask whether colleagues are affected and your recognised union is negotiating collectively.

What a flexibility clause can actually allow

Ask how the clause covers this change. “Duties as required” does not automatically authorise a pay cut. Acas says flexibility clauses must only be used for reasonable changes, with consultation and reasonable notice.

Moving a supermarket checkout worker from days to permanent nights at short notice raises questions about the clause’s scope and the worker’s circumstances. The answer depends on the contract. A broad clause does not remove equality duties.

Keep every signed version and read what must be in an employment contract. Take the exact wording to your union or adviser.

If they impose it anyway

Your route depends on what happened and whether you are an employee or a worker. The contract’s label does not settle your status.

An unlawful deduction claim seeks pay you are owed, without minimum service. Ordinary unfair dismissal usually requires two years today. Some automatically unfair reasons, including certain union-related dismissals, have no qualifying period.

A fundamental breach may let an employee resign and claim constructive unfair dismissal. You must establish the breach and that you resigned in response. Resigning gives up your wage while the claim is disputed. Read our constructive dismissal guide and get advice before leaving.

Fire and rehire today, and the scheduled restrictions

Fire and rehire means dismissing employees and offering re-engagement on changed terms. It is not automatically unlawful today, but an employer cannot assume that a business reason makes every dismissal fair. Your refusal does not give them a free pass.

The statutory dismissal and re-engagement Code has applied in Great Britain since 18 July 2024. It calls for meaningful consultation, alternatives and dismissal only as a last resort. The employer should contact Acas before raising dismissal, and should not use a threat as a bluff. Unreasonable non-compliance can increase relevant compensation by up to 25% for employer failure or reduce it by up to 25% for employee failure. Breaching the Code is not a standalone claim.

Proposing 20 or more dismissals and rehires at one establishment within 90 days triggers collective consultation with the recognised union or appropriate elected representatives. Consultation must begin in good time, at least 30 days before the first dismissal for 20 to 99 employees or 45 days for 100 or more. Failure can mean a protective award of up to 180 days’ gross pay per affected employee for dismissals on or after 6 April 2026. That maximum is not an automatic payment.

What is scheduled for March 2027

The government’s timetable updated on 22 October 2026 places new fire-and-rehire protections in March 2027. It separately schedules a six-month qualifying period for ordinary unfair dismissal for dismissals from 1 January 2027, and removal of the compensatory award cap. These are not current rights. Future dates remain subject to parliamentary processes.

Section 28 of the Employment Rights Act 2025 provides for automatically unfair dismissal where the principal reason is refusal of a “restricted variation”, or re-engagement or replacement on restricted changed terms to perform the same or substantially the same duties. Once commenced, no qualifying service is needed, but the employee must have started work. Narrow financial-difficulties exceptions do not automatically make dismissal fair.

Restricted variations include reduced sums payable, changed work measures used to calculate pay, pension terms, required hours and reduced time off. Most expenses and benefits are outside that pay category, except travel and accommodation costs and long-term accommodation provided as a benefit. A shift-pattern change is restricted only where it moves you between day and night working (11pm to 6am) or between weekday and weekend working; smaller shifts in timing fall under the ordinary unfair-dismissal test instead. Adding a clause allowing unilateral restricted changes is covered too. This restricts dismissal to force changes, not every agreed change or existing flexibility clause.

Non-restricted changes, such as duties or location, remain subject to ordinary unfair dismissal assessment, including consultation and anything offered in return.

When the decision comes from an algorithm

Since 5 February 2026, UK GDPR Articles 22A to 22D have replaced Article 22 through the Data (Use and Access) Act 2025. A decision using personal data with a legal or similarly significant effect, and no meaningful human involvement, must have safeguards. You must be able to receive information, make representations, obtain human intervention and contest it. Automated pay cuts or dismissal may qualify; a manager meaningfully deciding after an AI recommendation is not necessarily a solely automated decision.

Ask who decided, what data they used and for human review. Significant automated decisions using special-category data, such as health information, face additional restrictions. Unresolved data complaints can go to the Information Commissioner’s Office. That does not replace an employment claim or stop its deadline.

A neutral-looking rule can be indirect discrimination if it disadvantages a protected group and you, without objective justification. A care home reserving better-paid shifts for people available for nights may disadvantage women with childcare responsibilities. The evidence matters. Caring responsibilities are not themselves a protected characteristic.

A disabled worker may also need reasonable adjustments. Buying software does not remove equality duties. See workplace monitoring and AI in recruitment for related questions.

When the rota cuts your income without changing a term

A contract genuinely guaranteeing no hours may allow fewer shifts without a variation. For example, a care worker earning £12.71 an hour loses £394.01 gross a week when 35 paid hours become four: £444.85 falls to £50.84. That does not make the cut lawful.

Check guaranteed hours, established contractual arrangements and the reason for the cut. A zero-hours label does not settle employee status or whether stopping work amounts to dismissal. Discriminatory cuts can still be challenged. Workers retain minimum wage, deduction and written-statement rights; ordinary unfair dismissal protection belongs to employees.

Guaranteed-hours rights, reasonable shift notice and short-notice payments are scheduled for 2027, with exact timings unconfirmed. Do not plan your rent around a January promise. See our zero-hours guide.

Agency work and self-employment

Agency workers generally qualify for equal basic conditions after 12 qualifying weeks in the same role with the same hirer, including basic pay, relevant working-time and holiday terms. That does not mean every benefit. Proposed agency guaranteed-hours rights are not yet available. Genuinely self-employed people rely on their commercial contracts, not employee unfair dismissal rules. Seek status advice if the label looks wrong.

For retail, try Usdaw; for care and health, UNISON. GMB, Unite and IWGB also organise relevant sectors. Ask about representation and limits on help with pre-existing disputes. A recognised union can challenge proposals collectively before everyone faces an individual pay cut.

Scotland and Northern Ireland

These contract, dismissal and consultation rules apply in England, Wales and Scotland. UK data protection law applies across the UK.

Northern Ireland has separate employment legislation. Nidirect explains agreement and flexibility clauses. The Great Britain Code and new fire-and-rehire restrictions do not extend there; nor are the Equality Act 2010 employment provisions its discrimination framework. Use the Labour Relations Agency, check local deadlines and read our Northern Ireland guide.

Protect your claim deadline while you challenge the change

Acas’s guidance updated on 1 October 2026 gives most Great Britain claims about earlier events three months less one day. For most events on or after that date, it is six months less one day. Wage claims normally run from the incorrect payment, dismissal claims from effective termination.

Scottish tribunal breach of contract claims change later. Breaches before 9 November 2026 retain three months less one day; breaches on or after it have six months less one day. These are not civil court claim limits.

Timely notification to Acas pauses the clock during early conciliation. Calculate the final deadline using those dates. Grievances, appeals and payroll promises do not stop time. Multiple deductions or discriminatory incidents can complicate the calculation.

1. Record the dates. Note each incorrect payment and any termination date.
2. Get free advice. Take the evidence to your union, Acas, Citizens Advice or a law centre. Raise a written grievance without delaying conciliation.
3. Notify Acas in time. This is normally required before claiming. Northern Ireland uses the LRA and its rules.
4. Report minimum wage underpayment. Use the pay and work rights complaint route for HMRC enforcement. Reporting does not extend your tribunal deadline.
5. Calculate the final deadline. Ask your adviser to assess the separate claims. Do not resign or sign replacement terms without advice.

Questions people ask

Can your employer change your contract without asking you?

Normally a change needs agreement. A valid flexibility clause or an authorised collective agreement may permit a particular change without fresh individual consent. Ask what your employer relies on. AI does not add a new power.

Do new AI duties always mean a new contract?

No. A tool used to carry out existing contractual duties may not change a term. A new pay rate, reduced guaranteed hours or duties outside the agreed role need a separate assessment.

Can a chatbot say that silence means acceptance?

That statement does not establish agreement. Continuing to work without objecting may support an argument that you accepted the terms by conduct. Object in writing and seek advice.

Do you need two years’ service to challenge a pay cut?

No minimum service applies to an unlawful deduction claim. Ordinary unfair dismissal generally requires two years today, with exceptions for some automatically unfair reasons. The reduction to six months is scheduled for dismissals from 1 January 2027.

Is fire and rehire already banned?

No. Current fairness rules, the Code and collective consultation obligations can apply. New restricted-variation dismissal protections are scheduled for March 2027, subject to exceptions and regulations.

What if you are offered fewer shifts on a zero-hours contract?

Check your actual terms and status. There may be no guaranteed hours to enforce, but a discriminatory cut or termination can raise other claims. Contact your union or adviser.

Sources

1. Changes to employment contracts, Acas
2. If your employer proposes changes, including flexibility clauses, Acas
3. If changes happen without your agreement, Acas
4. Dismissal and rehire, including collective consultation, Acas
5. Employment Rights Act 1996, section 4, statement of changes, legislation.gov.uk
6. Employment Rights Act 1996, Part II, protection of wages, legislation.gov.uk
7. Employment Rights Act 1996, section 98, unfair dismissal, legislation.gov.uk
8. Dismissal and re-engagement Code of Practice, GOV.UK, in force from 18 July 2024
9. Employment Rights Act 2025, section 28, restricted variations, legislation.gov.uk
10. Employment Rights Act 2025, section 30, protective award maximum, legislation.gov.uk
11. Plan to Make Work Pay and Employment Rights Act timeline, GOV.UK, updated 22 October 2026
12. Unfair dismissal rights and scheduled qualifying-period changes, GOV.UK
13. Data (Use and Access) Act 2025, section 80, automated decisions, legislation.gov.uk, substantive provisions in force from 5 February 2026
14. Make a data protection complaint, Information Commissioner’s Office
15. Equality Act 2010, section 19, indirect discrimination, legislation.gov.uk
16. Changes to employment conditions, nidirect
17. Employment advice and conciliation in Northern Ireland, Labour Relations Agency
18. National Minimum Wage and National Living Wage rates, GOV.UK
19. Agency workers’ rights, including the 12-week qualifying period, GOV.UK
20. Employment tribunal time limits, including October and November 2026 transitions, Acas, updated 1 October 2026
21. Early conciliation, Acas
22. Pay and work rights complaints, GOV.UK
23. Tribunals statistics quarterly, January to March 2026, Ministry of Justice, 2025/26 figures used in the reality check
24. Minimum wage naming round, 3 September 2026, GOV.UK, figures used in the reality check