What Is the Modern Slavery Act 2015? UK Guide 2026

The Modern Slavery Act 2015 is one of the most significant pieces of UK legislation addressing exploitation, human trafficking and forced labour. While much of the Act focuses on criminal offences and victim protection, it also introduced direct corporate reporting obligations that affect thousands of commercial organisations operating in the UK.

For employers, compliance with the Modern Slavery Act is not simply a reputational exercise. It intersects with supply chain governance, employment law, immigration compliance and board-level risk management. In particular, Section 54 of the Act — the transparency in supply chains provision — requires certain businesses to publish an annual modern slavery statement.

What this article is about

This guide explains what the Modern Slavery Act 2015 is, the key offences it created, how Section 54 operates, which organisations must comply, what must be included in a modern slavery statement, and how employers can align employment and immigration compliance practices with modern slavery obligations.

Section A: What Is the Modern Slavery Act 2015?

The Modern Slavery Act 2015 consolidated and strengthened existing UK criminal law relating to slavery and human trafficking. It introduced tougher sentencing, enhanced enforcement powers and, critically for employers, a statutory transparency regime aimed at exposing modern slavery risks in corporate supply chains.

Although commonly associated with criminal prosecutions, the Act has become a governance and compliance framework for businesses operating in or connected to the UK.

1. Purpose and Scope of the Act

The primary objectives of the Modern Slavery Act 2015 were to consolidate existing slavery and trafficking offences into a single legislative framework, increase maximum penalties for offenders, improve protection and support for victims, enhance law enforcement cooperation, and introduce corporate transparency obligations.

The Act applies across England and Wales, with related provisions for Scotland and Northern Ireland. Certain offences have extraterritorial effect, meaning that UK nationals and UK residents can be prosecuted for relevant conduct committed abroad.

Importantly, the Act does not only address traditional concepts of slavery. It reflects modern patterns of exploitation, including labour exploitation within legitimate business environments.

2. Key Criminal Offences Under the Modern Slavery Act

While this guide focuses on employer compliance, it is important to understand the core criminal framework.

Section 1 – Slavery, servitude and forced or compulsory labour

Section 1 makes it a criminal offence to hold another person in slavery or servitude, or to require another person to perform forced or compulsory labour.

The courts interpret these concepts by reference to Article 4 of the European Convention on Human Rights. Indicators may include coercion, threats, restriction of movement, confiscation of identity documents, debt bondage or abuse of vulnerability.

Section 2 – Human trafficking

Section 2 criminalises arranging or facilitating the travel of another person with a view to their exploitation. Travel includes movement within the UK as well as cross-border movement.

Exploitation may include forced labour, sexual exploitation, removal of organs or securing services by force or deception.

Section 45 – Defence for victims

Section 45 provides a statutory defence for victims of slavery or trafficking who commit certain offences as a direct consequence of their exploitation. The defence does not apply to all offences and is subject to exclusions for specified serious offences.

For employers, understanding this defence can be relevant when dealing with workers who may have irregular immigration status or who may appear to have breached workplace rules under coercion.

3. Why the Modern Slavery Act Matters for Employers

Although criminal liability for slavery offences arises in extreme circumstances, the Act’s corporate transparency provisions create ongoing obligations for large businesses.

The introduction of Section 54 — transparency in supply chains — shifted modern slavery from being solely a criminal justice issue to a corporate governance and ESG issue.

For employers, the Act now engages procurement processes, labour supply chain oversight, agency worker arrangements, international recruitment practices, immigration compliance systems and board-level risk reporting. These risks often sit alongside wider compliance obligations that are subject to Home Office oversight, including UKVI compliance and enforcement.

In operational terms, effective governance often depends on robust contracting arrangements, including clear written terms in the employment contract and careful handling of contingent labour models across different types of employment contracts.

Failure to address modern slavery risks may expose an organisation to reputational damage, investor scrutiny, procurement exclusion and potential enforcement action.

The Act does not impose a statutory duty on businesses to guarantee that slavery does not occur. Instead, it requires certain organisations to publish an annual statement describing the steps they have taken, if any, to ensure slavery and human trafficking are not taking place in their operations or supply chains.

This distinction is legally important and central to understanding compliance under Section 54.

Section A Summary

The Modern Slavery Act 2015 consolidates UK slavery and trafficking offences and establishes criminal liability for exploitation under Sections 1 and 2, with victim protections under Section 45. For employers, however, its most significant feature is Section 54, which imposes a corporate transparency obligation on qualifying commercial organisations. Compliance therefore requires governance oversight, supply chain due diligence and alignment with employment and immigration controls.

Section B: Section 54 Modern Slavery Act 2015 – Transparency in Supply Chains

Section 54 of the Modern Slavery Act 2015 introduced a statutory transparency obligation on certain commercial organisations. It is the provision most directly relevant to employers and corporate governance teams.

Rather than imposing a strict duty to eradicate modern slavery, Section 54 requires qualifying organisations to publish an annual statement setting out the steps they have taken during the financial year to ensure slavery and human trafficking are not taking place in their business or supply chains.

Understanding the precise scope of this duty is critical. The legal obligation is one of reporting, not absolute prevention. However, in practice, investor scrutiny, procurement requirements and reputational risk mean that passive compliance is rarely sufficient.

1. What Is Section 54?

Section 54 is formally titled “Transparency in supply chains etc.”

It requires a commercial organisation that supplies goods or services, carries on a business or part of a business in the UK, and has a total annual turnover of £36 million or more to prepare a slavery and human trafficking statement for each financial year.

The statement must set out the steps the organisation has taken during the financial year to ensure that slavery and human trafficking are not taking place in its business or supply chains, or that the organisation has taken no such steps.

The second limb is legally significant. An organisation technically complies with the statutory minimum by publishing a statement confirming that no steps have been taken. However, such an approach would expose the business to significant reputational and commercial consequences.

Section 54 applies irrespective of where the organisation is incorporated. Overseas companies carrying on business in the UK may therefore fall within scope.

2. Which Organisations Must Comply?

A commercial organisation must publish a statement if it meets all of the following criteria:

• It is a body corporate or partnership
• It carries on business, or part of a business, in any part of the UK
• It supplies goods or services
• It has a total annual turnover of at least £36 million

“Total turnover” is calculated on a global basis and includes the turnover of subsidiary undertakings.

The Act does not restrict the obligation to particular sectors. Retail, manufacturing, professional services, construction, technology, financial services and hospitality businesses may all fall within scope.

The reporting duty applies on a group-wide basis. A parent company may publish a group statement covering subsidiaries, provided the statement clearly identifies the entities covered.

Smaller businesses below the threshold are not legally required to publish a statement. However, many do so voluntarily, particularly where they form part of larger supply chains subject to Section 54 reporting.

3. What Is a Modern Slavery Statement?

A modern slavery statement is a public document describing the organisation’s approach to managing modern slavery risks within its operations and supply chains.

The statement must relate to a specific financial year, be approved by the board of directors (or equivalent management body), be signed by a director (or equivalent), and where the organisation has a website, be published on that website with a prominent link on the homepage.

If an organisation does not have a website, it must provide a copy of the statement in writing within 30 days of receiving a written request.

The Act does not prescribe a fixed publication deadline. Instead, the statement should be published as soon as reasonably practicable after the end of the financial year.

The Secretary of State operates an online Modern Slavery Statement Registry. Registration is currently voluntary, although many organisations choose to upload their statements to demonstrate transparency.

4. What Should Be Included in the Statement?

Section 54 does not mandate specific content. However, statutory guidance issued by the Home Office suggests that statements may include information about:

• The organisation’s structure, business and supply chains
• Policies in relation to slavery and human trafficking
• Due diligence processes in relation to slavery and human trafficking
• The parts of the business and supply chains where there is a risk of slavery and the steps taken to assess and manage that risk
• Effectiveness measured against appropriate performance indicators
• Training about slavery and human trafficking available to staff

While these areas are not currently compulsory, organisations are expected to provide meaningful, transparent reporting rather than generic policy statements.

In practice, statements that lack detail may attract criticism from investors, NGOs, procurement authorities and regulators.

5. Board Approval and Corporate Governance

Section 54 elevates modern slavery to board-level responsibility.

The statement must be approved by the board of directors (or equivalent body), clearly state that board approval has been given, and be signed by a director (or, for LLPs, a designated member).

This requirement ensures that modern slavery risk is considered at senior management level and integrated into wider governance and ESG reporting frameworks. For organisations managing wider Home Office compliance exposure, it also sits alongside related governance obligations under sponsor guidance.

For listed companies and large private groups, the modern slavery statement increasingly interacts with sustainability reporting, corporate governance disclosures and investor engagement processes.

Section B Summary

Section 54 of the Modern Slavery Act 2015 imposes a transparency obligation on commercial organisations with a global turnover of £36 million or more that carry on business in the UK. The duty is to publish an annual statement describing steps taken to address slavery and human trafficking risks in operations and supply chains. While the legal requirement is one of reporting rather than elimination, governance expectations, investor scrutiny and procurement pressures mean that meaningful compliance requires active due diligence and board oversight.

Section C: Modern Slavery Act Compliance for Employers – Employment and Immigration Risk Integration

Although Section 54 is framed as a transparency requirement, effective compliance demands more than drafting a statement. Employers must assess operational risk, particularly where labour supply chains, agency arrangements and migrant recruitment are involved.

Modern slavery risk frequently arises not through deliberate criminal conduct by employers, but through failures of oversight in recruitment practices, subcontracting arrangements and immigration compliance systems. As a result, modern slavery compliance must be integrated into HR governance, procurement controls and sponsor licence management.

1. Publication and Governance Requirements

As outlined in Section 54, qualifying organisations must publish a modern slavery statement for each financial year.

The statement must be approved by the board, be signed by a director or designated member, and where the organisation has a website, be published on the organisation’s website with a prominent link on the homepage.

While there is no fixed statutory publication deadline, the statement should be issued as soon as reasonably practicable after the end of the financial year.

From a governance perspective, organisations should ensure that modern slavery risk is formally allocated to a responsible senior manager, reporting lines exist between procurement, HR and compliance teams, board approval is evidenced and minuted, and successive statements demonstrate year-on-year progress.

Regulators and investors increasingly expect statements to show development, rather than repetition of generic wording.

2. Supply Chain Due Diligence

A central objective of the transparency regime is to expose labour exploitation risk within supply chains.

Employers should conduct proportionate due diligence, particularly in high-risk sectors such as construction, agriculture and food processing, care and hospitality, manufacturing and logistics.

Due diligence measures may include mapping supply chains, risk-based supplier questionnaires, contractual clauses requiring compliance with minimum labour standards, audit rights and termination rights for serious breaches.

Contractual protections alone are insufficient if not supported by monitoring and risk assessment.

Organisations using labour providers should also consider whether suppliers are licensed where required, for example by the Gangmasters and Labour Abuse Authority in regulated sectors.

3. Employment Law Risk Indicators

Modern slavery often intersects with employment law breaches.

Risk indicators may include excessive or unlawful wage deductions, non-payment of the minimum wage, confiscation of identity documents, tied accommodation arrangements, excessive working hours, restrictions on movement, and debt bondage arising from recruitment fees.

Employers should ensure pay practices comply with minimum wage legislation, contracts are clear and translated where appropriate, workers understand their rights, and internal reporting routes are accessible through practical processes such as a grievance procedure and, where needed, a compliant disciplinary procedure.

Whistleblowers who report suspected modern slavery may be protected under the Public Interest Disclosure Act 1998. Employers should ensure that reporting mechanisms are confidential, accessible and capable of escalation, supported by a clear whistleblowing policy.

In many sectors, risk concentrates in contingent labour arrangements, making it important to maintain clear governance over the use of an agency worker workforce, ensure day-to-day practices align with the Agency Worker Regulations, and apply appropriate controls when hiring agency workers.

Where modern slavery risk indicators overlap with day-to-day HR decision-making, employers should also ensure broader policy alignment with core employment law obligations.

4. Immigration Compliance and Sponsor Licence Risk

There is a significant overlap between modern slavery risk and immigration compliance.

Employers who sponsor migrant workers must comply with Home Office sponsor guidance, including conducting compliant right to work check processes, maintaining records, and following wider right to work checks requirements across the workforce.

In practice, this includes verifying status through the appropriate method, such as using a right to work share code where applicable, ensuring evidence is retained, and confirming the correct right to work documents have been checked and recorded. Employers should also ensure staff understand how individuals can prove your right to work so that recruitment teams do not create avoidable barriers or drive risky workarounds.

Exploitative practices may include charging recruitment fees to migrant workers, withholding passports, imposing unlawful deductions linked to sponsorship, or threatening immigration consequences to suppress complaints.

Such practices may expose an organisation not only to criminal risk under the Modern Slavery Act, but also to civil exposure under the prevention of illegal working regime and the potential loss of sponsorship permission.

Where labour is sourced through third-party recruiters, particularly overseas agents, employers should ensure recruitment fees are not passed to workers unlawfully, contracts with intermediaries prohibit exploitative practices, and due diligence extends beyond UK-based entities.

Modern slavery compliance therefore cannot be separated from immigration governance and should sit within the organisation’s wider UK immigration compliance framework.

5. Embedding a Risk-Based Compliance Framework

The Modern Slavery Act does not prescribe specific due diligence steps. However, organisations are expected to take proportionate action based on their size, sector and risk exposure.

A risk-based compliance framework may include annual risk assessments, targeted training for procurement and HR teams, clear supplier onboarding processes, incident response procedures, board-level oversight and documented performance indicators.

The objective is not to eliminate all risk, which may be unrealistic, but to demonstrate active management, transparency and accountability.

Section C Summary

Effective compliance with the Modern Slavery Act extends beyond publication of a statement. Employers must integrate modern slavery risk into supply chain oversight, employment law compliance and immigration governance. Particular attention should be given to agency labour, migrant recruitment practices and whistleblowing mechanisms. A proportionate, risk-based framework supported by board oversight is central to meaningful compliance.

Section D: Enforcement, Penalties and Future Reform of the Modern Slavery Act 2015

While Section 54 is framed as a transparency requirement rather than a substantive due diligence obligation, it is nonetheless enforceable. Organisations that treat the requirement as a purely administrative exercise may underestimate the regulatory and commercial consequences of non-compliance.

Understanding how the Act is enforced, and how reform proposals may reshape the regime, is essential for long-term compliance planning.

1. Current Enforcement Mechanisms

Under Section 54(11), if a commercial organisation fails to produce a slavery and human trafficking statement, the Secretary of State may seek an injunction, or in Scotland an order for specific performance, requiring the organisation to comply.

Failure to comply with such an order may amount to contempt of court.

There is currently no power under Section 54 to impose automatic civil financial penalties for failing to publish a compliant statement. The Act does not provide a regulator with routine monitoring powers equivalent to those found in data protection or competition law.

However, legal enforcement is not the only compliance risk.

In practice, scrutiny arises from investors and ESG reporting frameworks, NGOs and civil society organisations, public procurement processes, media investigations and stakeholder activism.

Organisations that publish minimal or formulaic statements may attract criticism even if they technically satisfy the statutory minimum.

2. Reputational and Procurement Consequences

The modern slavery statement has become a governance document.

Public sector contracting authorities increasingly review modern slavery compliance as part of procurement due diligence. Some frameworks require bidders to confirm compliance with Section 54 obligations.

Institutional investors may assess modern slavery disclosures as part of broader ESG evaluation. Inadequate reporting may influence investment decisions.

For multinational groups, the UK Modern Slavery Act may also interact with overseas reporting regimes and emerging international human rights due diligence frameworks.

Compliance is therefore not confined to domestic legal exposure.

3. Proposed Reforms to the Modern Slavery Act

Following the 2019 independent review of the Act, the government consulted on strengthening the transparency regime. Proposed reforms have included mandating the six reporting areas currently contained in guidance, introducing a fixed reporting deadline, extending the reporting requirement to certain public bodies, introducing civil financial penalties for non-compliance, and creating a single enforcement body for labour market regulation.

As of now, many of these reforms have not been enacted in legislation and remain subject to legislative priority.

Organisations should monitor developments closely, particularly in light of evolving labour market enforcement proposals and broader corporate governance reform.

A future regime may impose mandatory reporting categories, stronger monitoring mechanisms and financial sanctions for non-compliance. Preparing robust compliance systems now reduces risk if and when reforms are introduced.

Section D Summary

Although Section 54 does not currently impose financial penalties for non-compliance, it remains legally enforceable through court orders and carries significant reputational and commercial consequences. Proposed reforms may strengthen reporting obligations and introduce civil penalties. Employers should therefore treat modern slavery compliance as a strategic governance issue rather than a narrow disclosure requirement.

Modern Slavery Act FAQs

What is the Modern Slavery Act 2015?

The Modern Slavery Act 2015 is UK legislation that consolidates criminal offences relating to slavery, servitude, forced labour and human trafficking, and introduces corporate transparency obligations under Section 54 for qualifying commercial organisations.

What is Section 54 of the Modern Slavery Act?

Section 54 requires commercial organisations with annual global turnover of £36 million or more that carry on business in the UK to publish an annual statement describing the steps taken to address slavery and human trafficking risks in their business and supply chains.

Who must publish a modern slavery statement?

Any body corporate or partnership supplying goods or services, carrying on business in the UK, and meeting the £36 million turnover threshold must publish a statement for each financial year.

Is there a fixed deadline for publishing the statement?

The Act does not prescribe a specific date. The statement should be published as soon as reasonably practicable after the end of the financial year.

Can a company comply by stating that no steps were taken?

Yes. The Act permits an organisation to state that no steps were taken. However, this may expose the organisation to reputational and commercial risk.

Does the Modern Slavery Act apply to overseas companies?

Yes. Overseas organisations that carry on business, or part of a business, in the UK and meet the turnover threshold may fall within scope.

What happens if a company fails to publish a statement?

The Secretary of State may seek an injunction requiring compliance. Failure to comply with a court order may result in contempt proceedings.

How does the Act relate to immigration compliance?

Modern slavery risks may arise in migrant recruitment practices, unlawful deductions or exploitative sponsorship arrangements. Employers must align right to work checks and sponsor compliance with modern slavery risk management.

Conclusion

The Modern Slavery Act 2015 established both a criminal framework targeting slavery and human trafficking and a corporate transparency regime under Section 54. For employers, the transparency obligation is the most immediate legal requirement, but effective compliance demands broader integration with employment law, procurement governance and immigration controls.

Although the current duty is one of reporting rather than elimination, stakeholder expectations and potential reform mean that organisations should adopt a proactive, risk-based approach. Board oversight, supply chain due diligence and alignment with right to work and labour standards compliance are central to responsible governance under the Modern Slavery Act.

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