OPRaaS LSCA Self-Certification Course & Audit Platform

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Welcome to your OPRaaS Agency Self-Certification Course
in Labour Supply Chain Assurance.

Thank you for enrolling on the Labour Supply Chain Assurance Self-Certification Training Course. It’s great to welcome you!

We hope you enjoy the course and, find the content, additional reading materials, and use of the audit platform, all invaluable tools on your path towards achieving simplified compliance, with confidence.

If you have a query, please email the OPRaaS team for assistance.

You’ll find a handy, searchable, Glossary (clickable from the top menu) in addition to a FAQs page, that we’ll be regularly updating for our members.

We look forward to supporting your progress and helping you achieve LSCA Self-Certification!

Course Highlights

Throughout this course, you will:

Understand critical compliance areas such as PAYE, CIS, GDPR, and the Criminal Finances Act.
Identify and proactively manage risks of fraud and exploitation within your labour supply chain
Perform thorough due diligence and maintain compliant documentation
Implement robust processes to tackle modern slavery and safeguard ethical labour practices
Verify payroll compliance, contractual integrity, and payslip accuracy for contingent and temporary workers

Each module integrates real-world scenarios, actionable advice, and HMRC-backed insights to ensure immediate applicability in your workplace.

Course Content

Your learning journey covers:

11 Expert-led Modules featuring video introductions and audio guides.

Interactive Quizzes for knowledge reinforcement and progress tracking
Resources include a comprehensive, Self-Certification Form enabling you to enter data relating to your self-audit and validate your organisation’s practices online whilst assessing your progression
Essential compliance templates and links to the very latest regulatory advice
A recognised Certificate of Completion to demonstrate your expertise

Navigating The Course

Your personalised dashboard allows you to track progress, revisit modules, and access resources conveniently:

Modules completed are clearly marked
Sequential unlocking ensures structured learning
Progress is automatically saved for ease of use

Click HERE to watch a short explainer video showing you how to proceed through your course from enrolling to completion.

Help & Support

Our dedicated OPRaaS Support Team is here to assist you.

Reach out anytime through your course portal or via email at info@opraas.co.uk

Agency Audit Platform

Your online Self-Assessment Audit forms are accessible throughout the term of your subscription via your Audit Dashboard.

*Important Note - Training Content

Please note that the LSCA training content provided in this course, is current as of 20th November 2025.

The course content and materials are provided for general guidance only and is not legal or tax advice.

Some items (e.g., 2026 reforms) remain subject to final legislation/guidance. Case studies may reflect interim court decisions; allegations are not findings unless stated otherwise.

Course Content

Module Content

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What you will learn

Module Content

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M2.1 Topics Covered in this module

M2.2 Public Procurement of Goods and Services

M2.3 Key Area of Interest: Construction

M2.4 Key Area of Interest: National Health Service (NHS)

M2.5 A Case Study: HMRC vs. Ducas Limited and Related Entities

M2.6 Key Area of Interest: Security

M2.7 Understanding VAT Fraud in the Labour Supply Chain

M2.8 The Kittel Principle

M2.9 “Should Have Known” = Due Diligence Required

M2.10 What is HMRC Doing About Organised Labour Fraud?

M2.11 Strengthening Compliance Through Disclosure and Deterrence

M2.12 Summary

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Key Topics

The Importance of Labour Supply Chain Assurance

Organised Tax Fraud in the Construction Industry

For Businesses in the Construction Sector:

How to Ensure Labour Supply Chain Assurance Compliance

Supplier Compliance Verification

Managing Your Contingent Workforce

Contingent Workforce Tracking

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Labour Supply Chain Risk Assessments

Example Risk Identified during an OPRaaS Labour Supply Chain Audit

Steps to Perform a Risk Assessment

Supplier Due Diligence – CAR Principles

Labour Supplier Due Diligence

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Introduction

The importance of understanding Modern Slavery

Example of fraud and Modern Slavery in Construction

Signs of Modern Slavery in the supply chain

Modern Slavery Statement

Ask yourself these questions

Modern Slavery Quote

Worker Exploitation Risk Management

Ask yourself these questions:

Monitoring and Reporting Suspicions of Modern Slavery

Incident Response Protocol

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Introduction

Importance of the Criminal Finances Act 2017

Corporate Criminal Offence (CCO)

Ask yourself this question

Tax Evasion Risk Assessments

Prevention Procedures

Tax Compliance Monitoring

Staff and Contractor Training

Incident Documentation and Corrective Actions

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Introduction

Importance of Payroll Compliance

Payroll PAYE and CIS: A Clear Comparison

Payroll Tax Fraud in the Security Sector

How to assure compliant payroll of labour?

Payroll Compliance for PAYE and CIS

Key Information Documents (KID)

Payroll Process Integrity

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Introduction & The Step By Step Verification Process

Exploitation and the Risks to Workers

Auditing Workforce Payslips

PAYE Payslip Verification

Subcontractors’ and the Construction Industry Scheme (CIS)

Checklist for CIS Remittance Compliance

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Introduction

Contents of a Contract of Employment

Compliant Temporary Worker Employment Contracts

Construction Industry Scheme (CIS) Contracts

Compliant CIS Subcontractor Contracts

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Introduction & The Importance of General Data Protection Regulation (GDPR)

Legal Basis for Data Processing

Principles of Data Processing

Worker Rights

Modern Labour Risks and GDPR

Tools and Templates:

Summary

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Congratulations

How to complete your self assessment

Thank you

Acronym	Full Term	Definition
CFA 2017	Criminal Finances Act 2017	UK legislation introducing Corporate Criminal Offence (sections 45/46): failure to prevent the facilitation of tax evasion. Requires businesses to implement 'reasonable prevention procedures' (RPP). The only defence is having adequate RPP or showing it was not reasonable to expect such procedures.
MSA 2015	Modern Slavery Act 2015	UK legislation mandating supply chain transparency and worker safeguarding. Section 54 requires commercial organisations with ≥£36m turnover to publish annual modern slavery statements (board-approved, signed by director, published on website with prominent homepage link).
IR35	Off-Payroll Working Rules	Tax legislation determining whether a contractor should be treated as employed or self-employed for tax purposes. Since April 2021, medium and large private sector clients must determine contractor status and deduct employment taxes if inside IR35. Requires Status Determination Statement (SDS).
JSL	Joint & Several Liability	2026 legislation imposing strict liability on agencies and end-hirers for umbrella company tax debts, even where due diligence checks have been undertaken. Makes supply chain participants jointly responsible for unpaid PAYE taxes.
AWR	Agency Workers Regulations 2010	UK regulations giving agency workers the right to the same basic working and employment conditions as permanent employees after 12 weeks in a qualifying assignment (12-week parity rule).
Good Work Plan	Good Work Plan 2020	UK employment law reforms requiring written 'section 1 statement' of employment particulars to be given to employees and workers on or before day 1 of engagement (effective 6 April 2020). Sets out key terms but is not itself the contract.
Construction Act	Housing Grants, Construction and Regeneration Act 1996	UK legislation governing payment practices in construction contracts. Section 113 renders "pay when paid" clauses ineffective (except where upstream payer is insolvent). Requires clear due dates, final dates for payment, and compliant payment/pay less notices.
Pensions Act 2008	Pensions Act 2008	UK legislation establishing workplace pension auto-enrolment requirements. Employers must automatically enrol eligible workers into qualifying pension schemes and make minimum contributions.

Acronym	Full Term	Definition
HMRC	HM Revenue & Customs	UK government department responsible for tax collection, payment of tax credits and benefits, and enforcement of tax law. Operates PAYE, CIS, RTI systems and conducts compliance audits. Business Tax Account provides reconciliation data.
GLAA	Gangmasters and Labour Abuse Authority	UK government body regulating labour providers in certain sectors (agriculture, horticulture, shellfish gathering, food processing/packaging) and investigating worker exploitation. Operates licensing regime and has criminal investigation powers. Hotline: 0800 432 0804 (03000 718234 out of hours).
ICO	Information Commissioner's Office	UK independent authority upholding information rights. Enforces UK GDPR and Data Protection Act 2018. Personal data breaches must be reported to ICO within 72 hours where there's risk to individuals' rights. Provides guidance on lawful bases, DSARs, and data-sharing.
CITB	Construction Industry Training Board	Industry body that collects levy from construction employers (payroll ≥£80k in PAYE in last tax year, or ≥£80k net CIS payments) and provides training grants. CITB levy compliance is audited in construction-focused compliance audits.

Acronym	Full Term	Definition
PAYE	Pay As You Earn	HMRC's system for collecting Income Tax and National Insurance Contributions from employees' wages. Employers deduct tax before paying employees, then remit to HMRC. Operates under Real Time Information (RTI) reporting requirements.
CIS	Construction Industry Scheme	Tax deduction scheme for payments to subcontractors in construction industry. Contractors must verify subcontractors with HMRC before first payment and make deductions (20% for verified, 30% for unverified) on labour element only (excluding VAT and allowable materials). CIS300 returns due by 19th following tax month.
GPS	Gross Payment Status	CIS status allowing subcontractors to be paid without deductions. Must apply to HMRC and meet compliance tests (business test, turnover test, compliance test). Contractors must verify GPS and keep evidence; continue to file CIS300 but make no deduction.
CIS300	CIS Monthly Return	HMRC return submitted by contractors detailing total payments made to each subcontractor and CIS tax deductions applied. Must be filed by the 19th following the tax month (6th–5th). Should reconcile to subcontractor statements and bank payments.
CIS340	CIS340 Guidance	HMRC's official guidance document defining what constitutes 'construction operations' for CIS purposes. Only work qualifying under CIS340 can legitimately be paid through the Construction Industry Scheme. Includes site preparation, construction, alteration, repairs, demolition.
RTI	Real Time Information	HMRC system requiring employers to report PAYE information at or before each pay run. Consists of Full Payment Submission (FPS) for regular pay data and Employer Payment Summary (EPS) for adjustments/recoveries. Must reconcile to payslips and Business Tax Account.
FPS	Full Payment Submission	RTI submission reporting gross taxable pay, Income Tax, and NICs for each employee on each payday. FPS values must match payslips. Should not be used to mask under-deductions.
EPS	Employer Payment Summary	RTI submission used only for adjustments, such as recoveries, statutory payments, employment allowance claims, or apprenticeship levy. Should not be used to mask PAYE under-deductions.
Bacs	Bankers' Automated Clearing Services	UK electronic payment system used for direct debits and credits, including salary payments. Net pay on payslip must match Bacs transfer to worker's bank account. Never use "BACS" (incorrect).
UTR	Unique Taxpayer Reference	10-digit number issued by HMRC to identify individuals and businesses for tax purposes. Required for CIS verification and self-assessment tax returns. Note: UTR alone isn't proof of CIS verification; contractor must verify with HMRC before first payment.
NIC / NICs	National Insurance Contributions	UK social security tax paid by employees (via PAYE), employers (as on-costs), and the self-employed (Class 2/4 via self-assessment). Funds state benefits including state pension, statutory sick pay, and maternity allowance. CIS deductions are payments on account of Income Tax and Class 4 NICs.
NMW	National Minimum Wage	Legal minimum hourly rate employers must pay workers in the UK. Rates vary by age band. Post-deduction pay (after deductions for employer's own use/benefit) must not fall below NMW. Records must be kept for 6 years.
NLW	National Living Wage	Higher rate of National Minimum Wage for workers aged 21 and over. Often referred to together as "NMW/NLW". Different from voluntary Real Living Wage calculated by Living Wage Foundation.
AE	Auto-Enrolment (Pensions)	Workplace pension scheme where employers must automatically enrol eligible workers (aged 22+ to state pension age, earning ≥£10k annually) into a qualifying pension. Minimum contributions, opt-out rights, and re-enrolment (every 3 years) required.
P45	P45 (Leaving Employment)	HMRC form given to employees when they leave employment, showing pay and tax details for the year to date. New employer uses P45 to operate correct tax code. Emergency codes (e.g., 1257L W1/M1) apply without P45/P6.

Acronym	Full Term	Definition
DRC	Domestic Reverse Charge (VAT)	VAT mechanism for construction services where the customer accounts for VAT instead of the supplier. Applies to most construction services under CIS340. Designed to combat missing trader fraud in construction supply chains.
Kittel	Kittel Principle	EU/UK legal principle that a taxpayer who knew or should have known their transaction was connected to VAT fraud may be denied the right to deduct input VAT. Creates due diligence obligations for supply chain participants.
DR	Disguised Remuneration	Tax avoidance arrangements designed to pay individuals while avoiding income tax and NICs, often involving loans, offshore entities, or trusts. HMRC actively targets such schemes. Loan charge applies to outstanding loans.

Acronym	Full Term	Definition
SDC	Supervision, Direction or Control	Key factor in determining employment status under agency rules (ITEPA 2003 s44). If a worker is under supervision, direction or control by any person (client, agency, end-hirer) over how they work, PAYE must be operated. SDC alone is not the general CIS status test—apply usual status tests (control, substitution, mutuality).
MOO	Mutuality of Obligation	Employment status indicator examining whether the employer is obliged to provide work and the worker is obliged to accept it. Absence of MOO suggests self-employment; presence suggests employment.
SDS	Status Determination Statement	Document required under IR35 reforms (April 2021) where medium/large clients must provide written reasons for their determination of a contractor's employment status for tax purposes. Must be given before contract starts or worker begins work.
CEST	Check Employment Status for Tax	HMRC's online tool for determining whether a worker should be classified as employed or self-employed for tax purposes. Results are binding on HMRC if information provided is accurate and not relating to highly complex arrangements.
PSC	Personal Service Company	Limited company through which a contractor provides their services. Often used by contractors working outside IR35, but subject to IR35 rules if the underlying relationship is one of employment. Requires SDS from medium/large clients.
KID	Key Information Document	Plain-English factsheet (not a contract) that agencies must give to workers before they agree to an assignment (Conduct of Employment Agencies and Employment Businesses Regulations 2003). Includes worked pay illustration, deductions, who pays the worker, benefits. Must be updated within 5 working days of any change.
ITEPA 2003	Income Tax (Earnings and Pensions) Act 2003	UK tax legislation governing employment income. Section 44 contains agency rules requiring PAYE where worker is under SDC. Section 61N–61R cover off-payroll working (IR35) for public sector and (from 2021) medium/large private sector.
DBS	Disclosure and Barring Service	UK government service providing criminal record checks for employment purposes (particularly roles working with children or vulnerable adults). Processing DBS data requires DPA 2018 Schedule 1 condition and appropriate policy document.

Acronym	Full Term	Definition
Umbrella	Umbrella Company	Employment intermediary that employs agency workers and contractors. Handles PAYE, pension, and employment administration while the worker performs assignments for end-clients arranged through agencies. Employer NICs/apprenticeship levy must be funded from assignment rate, not charged to workers as deductions.
MUC	Mini Umbrella Company	Fraudulent scheme where multiple small umbrella companies are created to exploit employment allowances and avoid tax obligations. Often phoenixing after accumulating tax debt. A significant compliance risk that supply chain audits help detect.
Phoenix	Phoenix Company Scheme	Fraudulent practice where a company accumulates tax debts, is dissolved, and re-emerges as a new entity to escape liabilities. A key risk factor in supply chain due diligence. Tolerance of phoenix suppliers by end users enables fraud cycle.
Purported	Purported Umbrella Company	Entity presenting itself as a legitimate umbrella company but failing to meet compliance standards, potentially operating tax avoidance schemes or misclassifying workers.
Hybrid	Hybrid Payment Model	Pay arrangement combining different payment methods (e.g., PAYE + CIS, or PAYE + PSC). Requires careful status assessment to avoid disguised remuneration or employment status breaches.

Acronym	Full Term	Definition
UK GDPR	UK General Data Protection Regulation	UK data protection law (retained EU law post-Brexit) governing processing of personal data. Requires lawful basis (Art 6), data minimisation, security, transparency (Arts 13-14), and respect for data subject rights. Works alongside Data Protection Act 2018.
DPA 2018	Data Protection Act 2018	UK legislation supplementing UK GDPR. Schedule 1 sets conditions for processing special category data (health, biometric, union membership) and criminal offence data (e.g., DBS checks). Provides exemptions (crime prevention, tax collection, legal professional privilege).
DSAR	Data Subject Access Request	Individual's right under Art 15 UK GDPR to obtain copy of their personal data. Must respond within one month (extendable by 2 months for complex requests). Usually no fee. Must verify identity proportionately.
DPO	Data Protection Officer	Required role for public authorities or organisations conducting large-scale systematic monitoring or processing special category data (Art 37). Oversees data protection compliance, advises on DPIAs, and acts as contact point for ICO and data subjects.
LIA	Legitimate Interests Assessment	Assessment required when relying on legitimate interests (Art 6(1)(f)) as lawful basis. Three-part test: identify legitimate interest → demonstrate necessity → balancing test (interests vs individual rights). Appropriate for audit/assurance; avoid consent for audits.
DPIA	Data Protection Impact Assessment	Required assessment where processing is likely to result in high risk to individuals (Art 35). Must complete for large-scale, systematic monitoring or extensive special category data processing. Documents risks, mitigation measures, and necessity/proportionality.
RoPA	Records of Processing Activities	GDPR requirement (Art 30) documenting all personal data processing activities. Must include purposes, lawful bases, data categories, recipients, retention periods, security measures, and international transfers. Must be available to ICO on request.
IDTA	International Data Transfer Agreement	UK mechanism for lawfully transferring personal data outside the UK (replacing EU Standard Contractual Clauses post-Brexit). Required unless recipient country has adequacy decision or other derogation applies. Alternative: UK Addendum to EU SCCs.
SCCs	Standard Contractual Clauses	EU Commission-approved contract templates for international data transfers. For UK data exports, use UK Addendum to EU SCCs or UK IDTA.
Art 28 DPA	Article 28 Data Processing Agreement	Mandatory contract between controller and processor (Art 28 UK GDPR). Must cover: subject matter, duration, data types, processing instructions, confidentiality, security, sub-processors, data subject rights assistance, breach notification, data deletion/return, audit rights.
Art 26	Article 26 (Joint Controllers)	UK GDPR provision for parties who jointly determine purposes and means of processing. Requires arrangement setting out respective responsibilities, data subject rights, and contact points. Different from controller-processor (Art 28) or controller-controller data-sharing.
Controller	Data Controller	Organisation that determines the purposes and means of processing personal data. Bears primary GDPR obligations. Agencies, umbrellas, and end-hirers usually act as independent controllers for their own audit/compliance purposes.

Acronym	Full Term	Definition
Instance	Audit Form Instance	Individual audit submission. Users can create unlimited instances, each stored as WordPress custom post type with responses in wp_opraas_audit_responses table. Assigned to logged-in user via post_author field.
Completion	Completion Score	Frontend metric showing percentage of questions answered (any answer counts). Includes ALL sections: Section 1 checkbox, Section 2 (8 fields), Declaration (7 fields), and all audit questions. N/A responses count as answered.
Compliance	Compliance Score	Backend metric measuring quality of compliance. Scoring: Yes=5 points, No=0 points, N/A=0 points (excluded from maximum), Don't Know=1 point. EXCLUDES Sections 1, 2, and Declaration entirely. ≥80% = Compliant, 60-79% = Partially Compliant, <60% = Non-Compliant.
Evidence	Evidence Files	Supporting documents uploaded to substantiate audit responses. Stored in AWS S3 via WP Offload Media plugin, with Evidence Table providing S3-aware ZIP downloads that temporarily download from cloud before adding to archives.
Red Flags	Red Flags	Warning indicators in audit questions identifying practices that may indicate non-compliance, fraud risk (phoenixism, MUCs, disguised remuneration), or regulatory breaches requiring immediate attention and remediation.

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Welcome to your OPRaaS Agency Self-Certification Course
in Labour Supply Chain Assurance.