Secondment Meaning And How It Works For UK Employers

If you’re running a small business, there’s a good chance you’ll hit a point where you need extra capability - but not necessarily a permanent hire.

Maybe you’ve won a short-term project, your team needs a specialist skill for a few months, or you’re collaborating with another business and want to “lend” someone to keep things moving.

That’s where a secondment can be a really practical option. But (as with most employment-related arrangements) it’s worth getting the legal side right from day one, so you don’t accidentally create confusion about who employs who, who manages performance, who carries the risk if things go wrong, or how pay and payroll will work in practice.

Below, we break down the meaning of a secondment, how secondments work in practice for UK employers, and what you should cover in writing before you agree to anything.

What Is A Secondment (And What Does Secondment Mean In Practice)?

In simple terms, a secondment is a temporary arrangement where an employee is assigned to work elsewhere for a set period - usually while remaining employed by their original employer.

So, if you’re asking:

• “What does secondment mean?” It usually means a temporary transfer/assignment of an employee to work for a different team, department, location, or even a different organisation.
• “Secondment definition?” A time-limited arrangement where an employee works under a different operational set-up, without necessarily changing their underlying employment relationship.

Secondments commonly happen:

• Internally (within the same company or group), such as moving someone from operations to a project team for 6 months.
• Externally (to another organisation), such as “lending” an employee to a partner business, a client, or another group company.

Secondment vs Hiring A Contractor

It’s easy to mix up secondments and contracting because both are often used for short-term needs.

The difference is that with a secondment, you’re typically dealing with someone who is already an employee (either yours or another business’s), whereas a contractor is usually self-employed or engaged through a separate business. If you’re weighing up options, it can help to compare a secondment with a properly drafted Contractor Agreement so you’re clear on control, responsibility, and risk.

Secondment vs TUPE Transfer

A secondment is usually temporary and does not normally move employment from one employer to another.

TUPE (Transfer of Undertakings (Protection of Employment) Regulations 2006) is different - TUPE applies when a business (or part of it) transfers, and employees move with it. Most secondments won’t trigger TUPE, but you should still be careful about arrangements that start as “temporary” and quietly become permanent in practice.

Why Would A Small Business Use A Secondment?

Secondments can be a smart commercial tool - especially when you’re growing, collaborating, or trying to stay flexible without committing to a permanent restructure.

Common reasons UK employers use secondments include:

• Short-term skills gaps: you need specialist expertise for a defined period (e.g. finance, HR, compliance, project delivery).
• Covering absence: maternity leave, long-term sick leave, or a temporary vacancy.
• Client delivery: you’ve agreed to provide a person “on site” to help deliver a contract or project.
• Group flexibility: moving talent between group companies or locations.
• Development and retention: giving a high-potential employee exposure to a new area (while still keeping them employed by you).

For small businesses, the big attraction is usually that secondments can offer:

• Speed (you’re not running a full recruitment cycle)
• Certainty (you can set a defined start/end date)
• Flexibility (you can design the arrangement around a real business need)

That said, secondments also create “shared responsibility” scenarios - and that’s exactly where employers can get caught out if the paperwork and practical management don’t match.

How Does A Secondment Work For UK Employers?

A secondment can look different depending on whether you are:

• the sending employer (you employ the individual and are seconding them out), or
• the host organisation (you are receiving a secondee into your business).

Either way, you want to be clear about three things:

• Who remains the legal employer (often the sending employer, but it can be fact-specific)
• Who directs the day-to-day work (often the host)
• What happens at the end of the secondment (return, extension, or a new arrangement)

It’s also important to remember that responsibilities and liability can be shared between the sending employer and the host (for example around workplace issues), depending on how the arrangement operates in practice.

Step-By-Step: Setting Up A Secondment

Here’s a practical process that tends to work well for small businesses.

1. Define the business reason and scope

   Be clear internally on what you actually need: a specific role, a project deliverable, coverage for absence, or skills transfer.

2. Confirm the secondment structure

   Is it internal (same employer) or external (another organisation involved)? External secondments usually need more detail and clearer risk allocation.

3. Check the existing employment terms

   Many issues can be avoided by checking the employee’s existing Employment Contract and any relevant policies, especially on mobility, duties, confidentiality, and secondments.

4. Agree practical management details

   Who approves holidays? Who reviews performance? Who supplies equipment? Who covers expenses?

5. Put the secondment terms in writing

   This is where a tailored Secondment Agreement becomes essential - especially for external secondments.

6. Onboard and monitor

   Even if the secondee is “temporary”, treat onboarding seriously: confidentiality, security access, training, and clear reporting lines.

7. Plan the exit early

   Don’t wait until the last week to decide what happens next. Confirm handover, return dates, and what happens to company property and access.

Do You Need The Employee’s Consent For A Secondment?

Often, yes - at least in practical terms.

If the secondment changes core terms (like duties, location, working hours, reporting lines, or pay arrangements), it’s risky to treat it as something you can impose informally. In the UK, making unilateral changes can lead to disputes, grievances, and in some cases claims such as breach of contract or constructive dismissal.

Even when a contract allows flexibility, it’s still good practice to document the arrangement clearly and confirm that it’s temporary.

What Should A Secondment Agreement Include?

A secondment arrangement is one of those situations where “we’ll sort it out as we go” can quickly become a problem.

A good secondment agreement (or secondment letter, depending on your set-up) will usually cover the key commercial and legal details that protect you, set expectations, and reduce the scope for disputes.

Here are the clauses UK employers commonly need to consider.

1) Parties And Status

• Who is the employer (sending employer)?
• Who is the host?
• Is the secondee remaining employed by the sending employer throughout?
• Is there any possibility of the secondee becoming employed by the host (and if so, when and how)?

This matters because employment status drives key obligations and risks - like payroll, tax, statutory rights, and liability exposure.

2) Term, Start Date, And End Date

• Secondment start date
• Expected duration
• Whether it can be extended (and by whom)
• What happens on expiry (return to role, return to a comparable role, or redeployment)

If you don’t specify the end point (or you keep extending informally), the secondment can start to look like a permanent change in practice - which can create legal and operational uncertainty.

3) Duties, Location, And Working Arrangements

• Role title and core duties during the secondment
• Reporting line (who gives instructions day-to-day)
• Work location (including remote/hybrid expectations)
• Working hours and any special requirements (travel, on-call, etc.)

It’s also worth checking you’re still compliant with the Working Time Regulations 1998 (rest breaks, holiday entitlement, working time limits) if working patterns change.

4) Pay, Benefits, Expenses, And Invoicing (If External)

This is where external secondments often go wrong - not because anyone is being difficult, but because assumptions differ.

• Who pays salary (often the sending employer, but it depends on the structure)?
• Will the host reimburse the sending employer (and on what basis)?
• Who covers expenses (travel, accommodation, meals, equipment)?
• What benefits apply (bonus, commission, private medical, car allowance)?

If there’s reimbursement, you’ll want a clear invoicing and payment mechanism to avoid cashflow headaches and disputes.

Tax and payroll can also be a key practical issue. For example, you may need to consider PAYE/NIC treatment and reporting, and (in some scenarios) off-payroll/IR35-style considerations if the arrangement is structured through intermediaries rather than a straightforward employee secondment. Sprintlaw can help with the legal documentation and employment risk, but we don’t provide tax advice - it’s worth checking the tax position with your accountant or a tax adviser before you finalise the structure.

5) Confidentiality, Data, And IP

Secondments often involve sharing information, systems, customers, and know-how - which means confidentiality and data protection need to be handled carefully.

• Confidentiality: what information the secondee can access and what they can do with it
• Data protection: whether personal data is being shared and what controls apply under UK GDPR and the Data Protection Act 2018
• Intellectual property (IP): who owns any work product created during the secondment

If personal data will be processed on behalf of another party, it may be appropriate to align the arrangement with a Data Processing Agreement (or at least ensure the right controller/processor obligations are properly addressed).

6) Policies And Conduct

The secondee may be working day-to-day in a different environment, but you’ll still want clarity on behavioural expectations.

• Which workplace policies apply at the host site?
• Which employer handles disciplinary issues?
• How are grievances raised and managed?

This is where consistent documentation helps - for example, aligning expectations with a Staff Handbook or appropriate Workplace Policy documents.

7) Health And Safety

Health and safety responsibilities can become blurred in secondments, particularly where the host controls the workplace and daily activities.

In most secondments, the host will be responsible for day-to-day workplace health and safety (because they control the working environment), but the sending employer still has overarching duties to take reasonable steps to protect their employee. In practice, liability can be shared and will depend on the facts (including who had control over the work and the site).

Your agreement should clearly allocate responsibilities such as:

• site inductions and training
• risk assessments
• incident reporting
• equipment provision

8) Ending The Secondment Early

Even when everyone has good intentions, plans change.

You’ll usually want a clause covering:

• notice required to end the secondment early (by sending employer, host, or the employee)
• what happens to pay and reimbursement
• return of property, access rights, and handover

Clear exit terms are particularly important if the secondment is linked to a client relationship, funding arrangement, or a deliverables-based project.

Common Legal Risks With Secondments (And How To Reduce Them)

Secondments are common - but they can create legal risk if the arrangement is vague or if the “paper position” doesn’t match how things work day-to-day.

Here are some of the key legal and practical issues to watch.

Risk 1: Confusion About Who The Employer Is

If the host controls everything (hours, duties, performance, discipline) and the sending employer becomes hands-off, you risk arguments about who the “real” employer is.

That can affect liability for:

• employment claims
• workplace disputes
• tax and payroll issues
• health and safety responsibilities

How to reduce the risk: clearly document the relationship and make sure your management approach matches the agreement. Also be aware that, depending on the facts, the host and sending employer can both have obligations and potential liability (for example where the host is directing the day-to-day work).

Risk 2: Discrimination, Harassment, And Workplace Culture Issues

If a secondee is working in a host business, they still have legal protections under the Equality Act 2010. If issues arise (for example, harassment by host staff), both organisations can end up involved - especially if responsibilities weren’t clear or complaints weren’t handled properly.

How to reduce the risk: define reporting lines for complaints, ensure training/inductions are completed, and confirm which policies apply during the secondment.

Risk 3: Confidentiality Leaks Or Client Poaching

Secondments often involve access to sensitive commercial information - pricing, suppliers, customers, strategy, and internal processes.

How to reduce the risk:

• limit access to what’s needed for the role
• use strong confidentiality clauses
• be clear on what happens to information at the end of the secondment
• consider non-solicitation or conflict provisions if appropriate

Risk 4: IP Ownership Disputes

Imagine your secondee creates a new process, piece of software, design, marketing content, or a client deliverable while working with the host. If it’s not clear who owns it, disputes can pop up later - usually at the worst possible time (like during fundraising, a sale, or a customer dispute).

How to reduce the risk: include IP ownership and licensing provisions in the secondment agreement and ensure they align with any existing employment/IP clauses.

Risk 5: “Temporary” Arrangements Becoming Permanent By Default

Secondments can drift. You start with 3 months, then extend another 3, then another 6 - and soon it’s been two years and everyone treats it as the person’s “real role”.

This can create:

• contract variation arguments
• uncertainty about return rights
• workforce planning issues

How to reduce the risk: use a fixed term with documented extension options, and diarise review points so you intentionally decide what happens next.

Key Takeaways

• A secondment is a temporary arrangement where an employee is assigned to work in a different role, team, location, or organisation - often while staying employed by the original employer.
• Secondments can be a flexible way to fill skills gaps, cover absences, support client delivery, or share talent across group companies, without committing to a permanent restructure.
• For UK employers, the key is clarity on who employs the individual, who manages day-to-day work, and what happens at the end of the secondment - and recognising that obligations and liability can be shared and fact-specific.
• A well-drafted secondment agreement should cover term, duties, pay and expenses, confidentiality, data protection, IP ownership, workplace policies, health and safety, and early termination.
• Common secondment risks include blurred employer responsibility, discrimination/HR issues, confidentiality leaks, and IP disputes - most of which can be reduced with clear documentation and consistent management.
• Secondments can also raise practical payroll and tax questions (for example PAYE/NIC and reporting), and you may want to confirm the tax position with an accountant or tax adviser as part of setting the arrangement up (Sprintlaw doesn’t provide tax advice).
• Because secondments often involve overlapping legal responsibilities, it’s worth getting tailored advice before you finalise the arrangement, particularly for external secondments.

If you’d like help putting a secondment in place or reviewing your documentation, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.