Secondment
A temporary assignment where an employee is sent to work in a different department, subsidiary, or external organization for a defined period while remaining on the payroll of their original employer.
- What Is a Secondment?
- Types of Secondments
- Benefits of Secondments for Employers and Employees
- What to Include in a Secondment Agreement
- Legal and Tax Considerations
- Secondment Best Practices for HR Teams
- Secondment Statistics and Trends [2026]
- Internal vs External Secondments: Decision Framework
- Frequently Asked Questions About Secondments
What Is a Secondment?
Key Takeaways
- ✓A secondment is a temporary work assignment where an employee moves to a different role, team, or organization for a fixed period while their original employer retains them on payroll and benefits.
- ✓Secondments can be internal (within the same company) or external (to a client, partner, government body, or charity). Both types serve distinct development and business goals.
- ✓The secondee's original role is typically backfilled or held open, and they're expected to return once the assignment ends. This distinguishes secondments from permanent transfers.
- ✓71% of organizations that use secondments report improved cross-functional collaboration, and 40% of returning secondees receive a promotion within a year (Deloitte/i4cp).
- ✓Secondment agreements should cover duration, reporting lines, performance evaluation, intellectual property, confidentiality, and what happens if either party wants to end the arrangement early.
A secondment sends an employee to a different part of the business or an entirely different organization for a set period. The employee doesn't resign. They don't get a new employment contract. Their original employer keeps paying them and they stay enrolled in existing benefits. Think of it as a structured loan of talent. The seconding organization lends the employee, and the host organization borrows them. Internal secondments move people between departments, business units, or geographies within the same company. A finance analyst might spend six months in the operations team to understand supply chain costs firsthand. External secondments place employees with clients, partners, industry bodies, or nonprofits. A law firm might second an associate to a key client's in-house legal team for 12 months. What makes a secondment different from a transfer is the return ticket. The employee is expected to come back. Their home role (or an equivalent one) should be waiting for them. This is also what separates it from a permanent reassignment. The temporary nature is the defining feature.
Types of Secondments
Secondments come in several forms, each with different purposes, structures, and legal considerations.
| Type | Description | Typical Duration | Common Use Cases | Key Risk |
|---|---|---|---|---|
| Internal (same entity) | Employee moves to a different department or function within the same legal entity | 3-12 months | Cross-functional development, project staffing, succession readiness | Role drift: the secondee's home role changes while they're away |
| Internal (cross-entity) | Employee moves to a different subsidiary or business unit within the same group | 6-18 months | Knowledge sharing across group companies, integration post-M&A | Tax complications if entities are in different jurisdictions |
| External (client) | Employee works at a client's site under client direction | 6-24 months | Professional services, consulting, law firms | Dual loyalty conflicts, IP ownership disputes |
| External (partner/industry) | Employee works with an industry body, trade association, or partner company | 6-12 months | Regulatory expertise, industry relationship building | Confidentiality breaches, competitive information exposure |
| External (charity/NGO) | Employee volunteers at a nonprofit as a corporate social responsibility initiative | 3-6 months | Leadership development, employer branding, community engagement | Re-integration challenges on return |
| International | Employee is seconded to a role in a different country | 12-36 months | Global leadership development, market entry support | Immigration, tax equalization, family relocation costs |
Benefits of Secondments for Employers and Employees
Secondments aren't just a nice development perk. They solve real business problems when structured properly.
For the employer
Secondments build bench strength by exposing future leaders to different parts of the business before they're promoted. They break down silos by creating personal networks across departments. They reduce the cost of external hires for short-term project needs. And they improve retention: employees who've been seconded feel invested in and are 23% less likely to leave within two years of returning, according to a 2024 i4cp study. For external secondments, the benefits include strengthening client relationships, building regulatory knowledge, and developing a reputation as an employer that invests in people.
For the employee
The secondee gains new skills, builds a broader professional network, and gets exposure to different leadership styles and business challenges. It's career insurance. If their home function restructures, they've got transferable experience. If they want to pivot their career direction, the secondment lets them test it without burning bridges. Returning secondees consistently report higher confidence, wider organizational perspective, and clearer career goals. It's one of the few development tools that actually changes how people think, not just what they know.
What to Include in a Secondment Agreement
A written secondment agreement protects all three parties: the home employer, the host, and the secondee. Don't rely on informal arrangements.
- Start and end dates with clear extension and early termination clauses. Define what notice period applies if either party wants to cut the secondment short.
- Reporting lines during the secondment: who manages day-to-day work, who conducts performance reviews, and who handles disciplinary matters.
- Compensation details: who pays salary, who covers expenses, and whether additional allowances (hardship, relocation, travel) apply.
- Intellectual property and confidentiality: specify who owns work product created during the secondment and what information the secondee can and can't share.
- Return-to-role guarantee: confirm that the secondee will return to their original role or an equivalent position at the same grade and salary.
- Performance evaluation: define how the secondee will be assessed, who provides input, and how the secondment period counts toward promotion eligibility.
- Benefits continuity: confirm that pension, healthcare, leave accrual, and other benefits continue uninterrupted during the assignment.
Legal and Tax Considerations
Secondments create legal complexity that HR teams often underestimate. The issues multiply when secondments cross borders or involve external organizations.
Employment law risks
In many jurisdictions, if the host organization exercises enough control over the secondee's work, an implied employment relationship can form. This means the secondee could gain employment rights with the host (unfair dismissal protection, redundancy rights, benefits entitlement) even though there's no formal contract. UK case law has established this precedent clearly. To mitigate the risk, secondment agreements should state explicitly that no employment relationship with the host is intended, and the home employer should retain authority over disciplinary actions, termination, and major HR decisions.
Tax implications
International secondments trigger tax obligations in the host country if the secondee works there beyond certain thresholds (usually 183 days in a 12-month period). Even internal cross-border secondments within the same corporate group can create a "permanent establishment" risk, where the host country argues the seconding company has a taxable presence. Social security obligations also split across jurisdictions. Within the EU, the A1 certificate determines which country's social security applies. Outside the EU, bilateral social security agreements (or lack thereof) determine whether the employee pays into two systems.
Insurance and liability
If the secondee is injured at the host's workplace, whose workers' compensation insurance covers them? If the secondee causes damage or a data breach while working for the host, who's liable? These questions need answers before the secondment starts. The secondment agreement should address indemnification, insurance coverage, and liability allocation. Most organizations require the host to maintain adequate insurance covering the secondee during the assignment.
Secondment Best Practices for HR Teams
Running effective secondments requires planning before, during, and after the assignment.
- Define success criteria upfront. What skills or experience should the secondee gain? What deliverables does the host expect? Write these down in the secondment agreement.
- Assign a home-side sponsor (typically the secondee's original manager) who stays in touch throughout the assignment. Monthly check-ins prevent the secondee from feeling forgotten.
- Schedule a formal re-integration plan starting 4-6 weeks before the secondee returns. This includes briefing on organizational changes, reconnecting with the home team, and updating job responsibilities.
- Track secondment outcomes systematically: promotion rates, retention rates, engagement scores, and self-reported skill gains for returning secondees versus a control group.
- Create a secondment policy document that standardizes the process, eligibility criteria, application steps, and decision-making authority. Ad hoc secondments create equity concerns.
- Don't forget the backfill. The secondee's home team needs a plan for covering their work. Ignoring this creates resentment toward the secondment program.
Secondment Statistics and Trends [2026]
Data on how organizations use secondments and their measurable impact on talent outcomes.
Internal vs External Secondments: Decision Framework
Choosing between internal and external secondments depends on the goal. This comparison helps HR teams guide the decision.
| Factor | Internal Secondment | External Secondment |
|---|---|---|
| Administrative complexity | Low to moderate | High (contracts, IP, liability) |
| Legal risk | Minimal (same employer) | Significant (implied employment, tax) |
| Cost to home employer | Salary only (host covers workspace) | Salary plus potential margin or cost-sharing |
| Development breadth | New function, same culture | New function, new culture, new systems |
| Relationship benefit | Breaks internal silos | Strengthens client/partner relationships |
| Knowledge transfer risk | Low (stays in company) | Medium to high (competitive exposure) |
| Re-integration difficulty | Low (familiar environment) | Medium to high (culture readjustment) |
Frequently Asked Questions
Can an employee refuse a secondment?
Who pays the secondee's salary?
What happens if the secondee doesn't want to return?
How is a secondment different from a detachment or deputation?
Does secondment time count toward tenure and benefits accrual?
What if the secondment goes wrong?
Written by Adithyan RK