Last In, First Out For Senior Employees: When Can UK Employers Use It?

If you’re running a small business, restructures and redundancies can feel like the hardest part of growth (or survival). When you’re trying to reduce headcount quickly and fairly, a simple rule can look appealing: “last in, first out” (often shortened to LIFO).

But when the “last in” person happens to be a long-standing industry expert you hired recently, you may wonder whether a “last in, first out” approach is lawful where it means a senior hire would be the first to leave.

The short version is: LIFO can sometimes be used as part of a redundancy selection process, but it’s rarely safe to use it as your only selection method. Used incorrectly, it can create discrimination risks, unfair dismissal claims, and real damage to morale.

Below, we walk through when LIFO can be used, when it’s risky, and what to put in place to protect your business.

What Does “Last In, First Out” Mean In Redundancy?

Last in, first out is a redundancy selection approach where the employees with the shortest length of service in a role, team, or department are selected first.

In practice, LIFO can show up in different ways, for example:

• Pure LIFO: the newest employee is selected for redundancy first, without further scoring.
• LIFO as a tie-breaker: you use objective scoring criteria, and if there’s a genuine tie, you use length of service to break it.
• Length of service as one factor: “service” is one scoring category among several (skills, performance, qualifications, disciplinary record, etc.).

For many employers, the idea feels “neutral” because it’s based on a clear, factual metric. But employment law isn’t only about whether a criterion is easy to apply - it’s about whether it’s fair and whether it creates unlawful discrimination.

That’s why this issue can become complicated when the newest employee is also a senior hire. Your most recent recruit might be older, disabled, from overseas, recently returned from leave, or otherwise in a protected category - and a LIFO approach might affect them (and people like them) disproportionately.

When Can UK Employers Use LIFO For A Senior Worker?

LIFO isn’t “banned” in the UK, but it needs to sit within a fair redundancy process. Under the Employment Rights Act 1996, redundancy can be a potentially fair reason for dismissal. However, an employee will usually need 2 years’ continuous service to bring an ordinary unfair dismissal claim (though some dismissals are “day one” claims, including discrimination and certain automatically unfair reasons).

The risk usually comes from the selection method and the way you apply it.

1) Where LIFO Is More Likely To Be Defensible

LIFO is more likely to be defensible when:

• The selection pool is properly defined (i.e. you’ve fairly identified the roles at risk).
• Employees are genuinely interchangeable in the pool (similar skills, duties, and responsibilities).
• You are using LIFO as one factor rather than the only factor.
• You have consulted with affected staff and considered feedback.
• You have checked for discrimination impact and can justify the approach as proportionate.

Example: you have a team of three administrators with broadly identical duties, and you’re reducing the team to two. If you also assess skills and flexibility, and then use length of service only as a tie-breaker, this may be easier to justify than pure LIFO.

2) Where LIFO Is High-Risk (Especially For Senior Hires)

LIFO becomes higher risk where:

• The newest person is senior or specialist, and their role isn’t truly interchangeable with others.
• You’re effectively targeting a particular individual (even if that’s not your intention).
• The rule disadvantages protected groups (more on this below).
• You haven’t used objective criteria like skills and performance alongside service length.

For small businesses, the common danger zone is: you’ve hired an experienced operator to “level up” the business, cashflow tightens, and you decide it’s simplest to select the newest (and often most expensive) senior hire for redundancy. That can look logical operationally - but legally it can be risky if you haven’t structured the selection exercise carefully.

3) Don’t Confuse “Easy” With “Fair”

A fair redundancy selection process usually relies on objective, job-related criteria such as:

• skills and qualifications
• performance (supported by records)
• disciplinary record (documented and fair)
• attendance (handled carefully, especially where disability may be involved)
• flexibility to cover tasks (where genuinely needed)

If your business hasn’t historically recorded performance clearly, it’s worth tightening your HR processes well before you’re in a redundancy situation. For ongoing capability management, a lawful Performance Improvement Plan process can help you build an evidence base that’s separate from redundancy selection.

What Are The Legal Risks Of Using “Last In, First Out”?

Even where redundancy is real, you can still face claims if your selection approach is problematic. The key risks with LIFO are usually:

1) Indirect Age Discrimination

Under the Equality Act 2010, using length of service can (depending on your workforce demographics) disadvantage younger workers, because younger workers are statistically more likely to have shorter service.

That doesn’t automatically make LIFO unlawful - but it can create an indirect discrimination risk, meaning you would need to show the criterion is a proportionate means of achieving a legitimate aim.

If your LIFO approach is simply “it’s quick and simple”, that may not be enough. If your reasoning is tied to legitimate business needs (for example, retaining organisational knowledge in a small team) and you’ve used service only as one factor, your position can be stronger.

2) Other Indirect Discrimination Risks (Sex, Disability, Race)

LIFO can also disproportionately impact employees who have taken career breaks or worked part-time, which can overlap with protected characteristics (for example, women returning from maternity-related breaks, or individuals with disabilities who have had time off work historically).

It can also impact groups where shorter service is more common due to sector patterns and recruitment practices. That’s why it’s important to step back and check the bigger picture before deciding that “last in, first out” is the cleanest answer.

3) Unfair Dismissal Risk (Process And Pooling Issues)

If an employee has 2 years’ continuous service to claim ordinary unfair dismissal (and you don’t have another “day one” risk such as discrimination), the tribunal will generally look at:

• whether there was a genuine redundancy situation
• whether you selected a reasonable redundancy pool
• whether you used fair selection criteria
• whether you consulted properly
• whether you considered suitable alternative roles

For many small businesses, pooling is where problems begin. If you “pool” only the newest hire (effectively a pool of one), you’ll need to justify why their role is genuinely unique and not interchangeable with others.

4) Contract And Policy Misalignment

Check what your contracts and handbook say about redundancy and selection. If your documents promise a particular process (or imply one), departing from that can create disputes.

This is one of the reasons it’s worth getting your Employment Contract and related policies set up properly early - it gives you a clearer, more consistent framework to follow when things get stressful.

A Practical (And Safer) Way To Use LIFO In A Redundancy Process

If you’re considering LIFO, the goal is usually to keep your process objective, consistent, and documented. Here’s a practical approach that often works better than pure “last in, first out”.

Step 1: Confirm It’s A Genuine Redundancy Situation

Redundancy typically arises where:

• your business is closing (or one site is closing)
• you no longer need certain work to be done
• you need fewer employees to do that work
• the role is changing substantially, and the old role is effectively disappearing

Write down the business reason and keep records. If later challenged, you’ll want to show this wasn’t simply a preference to remove a particular person.

Step 2: Identify The Right “Pool” (Who Is At Risk?)

The “pool” should usually include employees who:

• perform the same or similar work; or
• have roles that are interchangeable in practice.

Be careful about automatically treating your newest hire as a standalone pool. If you’re leaning that way because they’re a senior hire, document what actually makes the role unique (responsibilities, specialist skills, client ownership, regulatory requirements, etc.).

Step 3: Choose Objective Selection Criteria (Use LIFO Carefully)

A safer approach is often:

• choose 3–6 role-related scoring criteria (skills, qualifications, performance, flexibility, etc.)
• score consistently across the pool
• use length of service only as a tie-breaker, or as a small part of the overall score

This is where you can still reflect the logic behind “last in, first out” - without making it your only selection method.

Tip: if you include performance as a criterion, make sure it’s backed by evidence. If you don’t have reliable performance records, you may need to rely more on skills/qualifications and less on subjective scoring.

Step 4: Consult Properly (Don’t Treat It As A Formality)

Consultation should be meaningful. Even in a small business, you should usually:

• explain the business reason for redundancy
• confirm the selection pool and criteria
• share individual scoring (where applicable)
• give the employee a real chance to comment and challenge
• consider ways to avoid redundancy (reduced hours, redeployment, etc.)

Where there are multiple redundancies, timeframes and obligations can become more complex. It’s worth getting clear on redundancy consultation periods early so you don’t accidentally move too fast.

Step 5: Consider Suitable Alternative Employment

Before confirming redundancy, consider whether there are suitable alternative roles available. In a small business, there may not be many options - but you should still check and document it.

This is particularly important if your selection method could be challenged. Showing that you genuinely explored alternatives can reduce your risk significantly.

Step 6: Handle Notice, Pay, And Paperwork Correctly

If redundancy goes ahead, you’ll need to deal with:

• statutory and/or contractual notice
• any redundancy pay entitlement
• holiday pay
• final payslip and deductions
• a clear letter confirming termination

Notice can be surprisingly technical once you factor in contract terms and statutory minimums. Make sure you understand redundancy notice periods so you don’t create a breach of contract issue on the way out.

Step 7: Watch For TUPE And Business Transfers

If your restructure is connected to a sale, outsourcing, or change in service provider, you may be dealing with TUPE (Transfer of Undertakings). That can heavily restrict redundancy options and change what is “fair”.

If there’s any chance you’re in that territory, it’s worth checking a TUPE transfer checklist before you start making decisions about who is “last in”.

Should You Use LIFO If The Employee Is Senior?

Seniority adds a practical business twist: the “newest” person might actually be the person with the biggest impact, the strongest network, or the most valuable skill set - but they may also be the highest cost.

If you’re considering using “last in, first out” mainly because of cost, be careful. Cost can be part of the wider business rationale for restructuring, but using cost (directly or indirectly) as a selection criterion can be legally risky and may increase the chance that a redundancy looks like you’re targeting an individual rather than selecting fairly between roles.

A better approach is often to ask:

• What work is reducing or changing?
• What skills do we need to retain to operate safely and profitably?
• Which roles are genuinely interchangeable?
• Which selection criteria reflect what the business will need after the restructure?

If the “senior” role is genuinely not required going forward (for example, you’re scaling down and removing a management layer), that can be a valid redundancy reason - but again, you’ll want to document the rationale carefully.

And if you’re worried the real issue is conduct or capability (rather than redundancy), don’t try to solve that through a redundancy exercise. In that situation, you’re usually better to follow a proper disciplinary or capability path, such as a documented Gross Misconduct process where appropriate, or structured performance management.

Key Takeaways

• “Last in, first out” (LIFO) isn’t automatically unlawful in the UK, but using it as the only selection method is usually high-risk.
• Using LIFO to select a senior hire just because they’re the newest employee can create legal exposure, especially if it disproportionately impacts protected groups or looks like you’re selecting an individual rather than a role.
• LIFO is generally safer when used as a tie-breaker or a small part of an objective scoring matrix (skills, qualifications, performance evidence, etc.).
• Your redundancy process should cover: a genuine redundancy situation, a fair selection pool, fair criteria, meaningful consultation, and consideration of suitable alternative roles.
• Check for additional complications like TUPE, and make sure notice and redundancy entitlements are handled correctly to reduce disputes.

If you’d like help running a redundancy process (including choosing fair selection criteria and reducing the risks around LIFO), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.