Can an Employer Legally Reduce Working Hours? What UK Businesses Need to Know

Running a business is rarely predictable. One month you’re flat out; the next, demand slows and costs rise. For many UK employers, the question eventually arises: can I reduce my employees’ working hours to keep the business sustainable?

It’s a fair question - and a very common one. The truth is that you can reduce working hours, but it must be done carefully, lawfully, and transparently. If not, what starts as a cost-saving measure could quickly turn into a legal headache.

In this guide, we’ll unpack when and how UK employers can reduce working hours, what the law expects of you, and how to protect your team’s trust while keeping your business compliant.

Why Employers Might Need to Reduce Working Hours

Even thriving businesses have ups and downs. Maybe sales have dipped, a contract has ended, or you’re entering a quieter season. Perhaps your company is restructuring to become leaner or adjusting to new technology that changes how work gets done.

Whatever the reason, reducing staff hours can sometimes be a sensible and fair way to manage costs without resorting to redundancies. But while the business rationale might make perfect sense, UK employment law sets strict boundaries around how and when you can change someone’s hours.

Think of it this way: working hours aren’t just a scheduling decision - they’re part of the legal contract between you and your employee.

Employment Contracts - The Foundation of Working Hours

Under the Employment Rights Act 1996, an employee’s working hours form part of their core contractual terms. That means you can’t simply decide to reduce them - even temporarily - without the employee’s consent or a contractual right to do so.

If you reduce hours (and pay) without agreement, it’s considered a breach of contract. This can open the door to:

• Claims for unlawful deduction of wages, since employees are legally entitled to the pay set out in their contract.
  
• Constructive dismissal claims, if the employee resigns because the change undermines their role or income.
  
• Discrimination risks, if the reduction affects certain groups unfairly (for example, parents or part-time staff).

So, what should employers do first?

Start by checking the employment contract. Some contracts include a variation or flexibility clause that allows for reasonable changes to working hours. For example:

“The Company reserves the right to vary your hours of work to meet operational requirements.”

Even so, that doesn’t give employers free rein. The courts expect such clauses to be used reasonably and after consultation, not as a way to impose sweeping changes without discussion.

If there’s no such clause - and in many small business contracts there isn’t - you’ll need to seek the employee’s informed, written consent to any reduction.

The Lawful Routes to Reducing Hours

There isn’t just one way to approach this - the right path depends on your circumstances. Here are the main options available to UK employers.

1. Reaching an Agreement

The safest and most constructive option is simply to agree. Be open about what’s happening in your business and why reduced hours are being considered. Most employees appreciate honesty - especially if the alternative could be redundancies.

Lay out the proposed change, discuss how long it will last, and confirm how pay and benefits will be affected. If the employee agrees, put it in writing, ideally as a variation to contract or updated contract altogether.

Example:

A café owner sees a winter slowdown and asks staff if they’ll move from five to four shifts per week for three months, promising to review things before spring. The staff agree, knowing it’s a short-term measure to protect everyone’s jobs. The owner confirms the change in writing - and stays compliant.

2. Using a Flexibility Clause

If your contract includes a clear flexibility clause, you might rely on it to adjust hours. But these clauses must be handled delicately.

They’re designed for small, reasonable adjustments - not major or indefinite reductions. Using them unfairly can still amount to breach of contract, because every employment relationship contains an implied duty of mutual trust and confidence (confirmed in Malik v BCCI ).

In practice, that means you must:

• Give notice before any change.
  
• Explain why it’s necessary.
  
• Consider employee feedback before finalising it.
  

3. Collective Consultation or “Fire and Rehire”

In rare cases - for example, during large-scale restructuring - you might need to formally change the terms for multiple staff. If 20 or more employees could be dismissed and re-engaged on new terms within 90 days, you’re legally required to consult collectively under TULRCA 1992.

This process involves at least:

• 30 days of consultation (for 20–99 staff), or
  
• 45 days (for 100+ staff).
  

You must also inform the Department for Business and Trade. This “fire and rehire” strategy is legal, but controversial. It should only be used as a last resort, once genuine consultation has failed.

Reducing Hours as an Alternative to Redundancy

Many employers reduce hours to avoid layoffs - and done right, it can be a win-win. You retain your trained team, protect morale, and maintain flexibility when business picks up again.

But even when reductions are made in good faith, the law still requires consent and fairness. You must not target certain employees or groups, and you should clearly explain how long the change will last.

If you present the reduction as a temporary business necessity rather than a permanent shift, staff are often more willing to cooperate.

Consulting with Employees - The Right Way to Do It

Consultation doesn’t have to mean formal meetings and lawyers at the table. It simply means talking openly with staff and considering their views.

A fair consultation should:

1. Explain the reason - e.g., financial pressures, market changes, or restructuring.
   
2. Set out what’s changing - how many hours are affected, and when.
   
3. Invite feedback - employees may suggest voluntary part-time arrangements or job shares.
   
4. Confirm agreements in writing - ideally via a variation letter or revised contract.
   

The Employment Rights Act 1996 also requires employers to confirm any contractual changes in writing within one month. This ensures everyone’s on the same page legally and practically.

What Happens If Employees Refuse to Agree?

Sometimes, even after consultation, employees may not accept reduced hours. That doesn’t necessarily mean you’re stuck - but it does mean you need to tread carefully.

You can:

• Revisit the proposal, negotiate, or offer time-limited reductions.
  
• Abandon the change, if the risk of dispute outweighs the benefits.
  
• Dismiss and re-engage under new terms - but only after following a fair process.
  

A dismissal for refusing new terms can be lawful if it’s based on “some other substantial reason” (SOSR) - a recognised defence under section 98 of the Employment Rights Act 1996.
However, fairness is still key: you must demonstrate business necessity, follow proper notice procedures, and consult meaningfully first.

Mind the Legal Boundaries - Pay, Benefits, and Minimum Wage

When reducing hours, employers sometimes overlook the practical knock-on effects.

If the new hours mean an employee’s overall pay dips below the National Minimum Wage, you’ll be in breach of the National Minimum Wage Act 1998. Always double-check calculations for hourly staff or casual workers.

Reducing hours can also affect:

• Holiday entitlement (which accrues pro-rata).
  
• Pension contributions, which fall if pay decreases.
  
• Bonuses and commissions, depending on how they’re structured.
  

These details matter, and employees are entitled to know how their benefits will be affected before agreeing.

Short-Time Working and Lay-Off Clauses

Some contracts contain short-time working or lay-off clauses, which allow temporary reductions in hours and pay when work is unavailable.

They can be useful, but they’re strictly regulated under the Employment Rights Act 1996 (Part XI). Employees can, after a certain period, claim redundancy if short-time working continues too long.

If you plan to use such clauses, seek legal advice first - they can be complex, and missteps often lead to claims.

Don’t Forget Equality and Fairness

Reducing hours can unintentionally disadvantage certain employees. Under the Equality Act 2010, you must ensure your decision doesn’t amount to indirect discrimination.

For example:

• Reducing flexible hours could disproportionately impact working parents (often women).
  
• Cutting hours for part-time staff might breach the Part-Time Workers (Prevention of Less Favourable Treatment) Regulations 2000.
  

Always consider who will be affected most and whether your decision can be justified as a proportionate means of achieving a legitimate aim - the legal test for fairness.

Example: Navigating a Tough Call

Imagine a design agency facing a six-month dip after losing a major client. Instead of laying off junior staff, management proposes a temporary 20% reduction in working hours (and pay) across the board.

They explain the situation clearly, share financial projections, and consult the team. Most employees agree - understanding that the alternative is potential redundancies.
The business confirms everything in writing, ensures no one’s pay drops below minimum wage, and reviews the arrangement quarterly.

The result? A fair, lawful, and collaborative solution that saves jobs and keeps morale intact.

Compliance Checklist for Employers

• Review contracts for flexibility or short-time working clauses.
  
• Consult with affected staff and record discussions.
  
• Confirm all changes in writing within one month.
  
• Check National Minimum Wage and benefit impacts.
  
• Conduct an equality impact check.
  
• Seek legal advice before using “fire and rehire”.
  

When to Get Legal Advice

Reducing hours might feel like a straightforward business decision, but in legal terms, it’s delicate. A single misstep - like imposing changes without consent - can undo months of goodwill and expose you to tribunal claims.

Getting advice before you act ensures you follow the correct process, meet consultation requirements, and document everything properly. It’s a small investment that protects your business and your team’s trust in the long run.

Key Takeaways

• You can reduce working hours with employee consent or a valid contractual right.
  
• Always consult openly and confirm changes in writing within one month.
  
• Check that pay remains above the National Minimum Wage.
  
• Be mindful of discrimination and equality risks.
  
• Seek advice if you’re unsure - prevention is always better than a tribunal.
  

If you’re considering reducing staff hours or reviewing contracts, Sprintlaw UK can help you plan the process, consult with employees, and draft the right documentation.

Contact our employment law team on 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.