Workforce Assured Accreditation: Why Agencies Need Evidence of ComplianceEvery payroll provider can say it takes compliance seriously. The more important question is whether it can prove it.
For recruitment agencies, supplier compliance is no longer something that can be assessed through reassuring conversations, polished policies or a logo on a website. Agencies need evidence that the businesses within their labour supply chains have the right systems, controls and governance in place.
This matters even more following the introduction of new PAYE rules for labour supply chains involving umbrella companies. From 6 April 2026, an agency with the direct contract to supply a worker to an end client can be held responsible where the correct PAYE has not been paid by an umbrella company.
Due diligence must therefore go further than taking a provider’s claims at face value.
Workforce Assured accreditation supports this shift towards evidence-led compliance. It provides independent recognition that a provider has been assessed against a standard designed around temporary labour and employment practices.
For agencies choosing payroll partners, that independent assessment can provide something increasingly valuable: confidence supported by evidence.
Why compliance claims are no longer enough
Most payroll and workforce providers use similar language.
They talk about trust, transparency, accurate payroll and robust compliance. Those principles matter, but the words alone reveal very little about how the provider operates behind the scenes.
A provider may have policies in place, but are those policies followed consistently? Are its systems subject to proper oversight? Can it demonstrate how workers are engaged and paid? Would its records and processes stand up to external scrutiny?
These are the questions agencies now need to ask.
HMRC advises employment businesses to carry out due diligence before using an umbrella company. Its guidance recommends identifying every business within the labour supply chain, understanding how workers are engaged and checking that PAYE is being operated correctly.
The new PAYE rules have increased the commercial importance of these checks. Where an umbrella company fails to account for the correct PAYE, HMRC can recover the amount from the responsible agency or, where no agency is involved, the end client.
Compliance claims may begin the conversation, but they cannot finish it.
Agencies need evidence that supports the promises being made.
What is Workforce Assured accreditation?
Workforce Assured is an accreditation focused on temporary labour and employment practices within the built environment.
It is designed to support legal compliance, good governance and better employment practices across labour supply chains. The accreditation provides independent recognition that a business has been assessed against a compliance-focused standard.
Workforce Assured was launched with support from leading UK construction contractors to raise standards around how companies recruit, engage and pay their workforces.
This makes the accreditation particularly relevant to recruitment agencies, contractors, payroll intermediaries and end clients operating within construction and related sectors.
Rather than relying entirely on a provider’s own description of its standards, agencies can see that an independent organisation has examined the business against defined expectations.
Accreditation does not remove the need for an agency’s own supplier checks. It should instead form part of a broader due diligence process, providing another meaningful source of evidence.
How Workforce Assured supports evidence-led due diligence
Strong due diligence is not a single form completed when a new provider joins a Preferred Supplier List.
It is an ongoing process of understanding who is within the labour supply chain, how each organisation operates and whether the appropriate controls remain in place.
Workforce Assured accreditation can strengthen this process in several ways.
Independent assessment
Self-assessment has limitations. A provider reviewing its own standards may have good intentions, but it cannot offer the same objectivity as an external assessment.
Independent accreditation introduces another level of scrutiny. It demonstrates that the provider has been prepared to open its processes to review rather than asking agencies simply to accept its assurances.
Defined standards
Vague commitments are difficult to measure.
An accreditation framework provides defined expectations against which a provider can be assessed. This helps move supplier conversations away from broad promises and towards systems, controls and evidence.
Stronger procurement decisions
When agencies compare potential payroll providers, price and speed should not be the only deciding factors.
Accreditation can help procurement and compliance teams identify providers that have made a demonstrable investment in responsible employment practices and supply chain governance.
Better client conversations
Agencies are increasingly expected to explain how they select and oversee their payroll partners.
Being able to reference independent accreditation can support discussions with end clients, particularly where those clients have strict procurement, governance or labour compliance requirements.
It gives the agency more than a verbal assurance to pass along the supply chain.
Why evidence matters under the PAYE rules introduced in April 2026
The PAYE rules for labour supply chains involving umbrella companies changed on 6 April 2026.
Where workers are supplied through an umbrella company, the agency holding the contract with the end client is responsible for making sure PAYE is operated correctly. If HMRC finds that the umbrella company has not paid the correct PAYE, it can recover the unpaid amount from that agency.
Where there is no recruitment agency in the supply chain, that responsibility sits with the end client.
The umbrella company remains responsible for calculating PAYE correctly and paying HMRC. However, the consequences of a failure can now travel further through the supply chain.
This makes supplier selection a financial and commercial risk decision, not simply an administrative one.
Agencies need to know:
- Who is employing and paying each worker
- Whether additional businesses appear within the payment chain
- How PAYE calculations and payments are controlled
- What information the provider will supply for verification
- Whether processes are documented and consistently followed
- What independent evidence supports the provider’s claims
Workforce Assured accreditation cannot replace these checks. No single accreditation should be treated as a shortcut around proper due diligence.
It can, however, contribute useful independent evidence that a provider takes governance, compliance and responsible workforce practices seriously.
What should agencies ask their payroll providers?
A credible provider should be comfortable answering detailed questions.
Agencies reviewing an existing supplier or considering a new payroll partner should ask for practical evidence, not simply a standard sales presentation.
Useful questions include:
- Which legal entity will employ or engage the worker?
- Will any other businesses be involved in the payment chain?
- How does the provider calculate and report PAYE?
- What controls are used to identify payroll errors?
- How are compliance responsibilities assigned internally?
- How often are policies and procedures reviewed?
- What documents can the provider supply to support agency checks?
- Has the business been independently assessed or accredited?
- What happens when an issue or discrepancy is identified?
- How will the provider support ongoing monitoring?
The quality of the response matters as much as the answer itself.
Clear documentation, transparent processes and a willingness to provide evidence indicate a very different compliance culture from vague assurances or defensive answers.
A reliable partner should make due diligence easier, not treat it as an inconvenience.
Accreditation should support due diligence, not replace it
Independent accreditation is valuable, but agencies should avoid treating any badge as a complete compliance strategy.
A strong approach combines several layers of scrutiny.
This may include:
- Verifying company and legal entity details
- Mapping the complete labour supply chain
- Reviewing contracts and employment documentation
- Checking relevant insurance
- Examining sample payroll records and payslips
- Understanding how tax and National Insurance are handled
- Confirming how workers receive support
- Reviewing independent accreditations
- Repeating checks at suitable intervals
- Recording findings and actions clearly
This distinction is important.
Evidence-led due diligence does not mean collecting certificates and storing them in a folder. It means understanding what those certificates represent, combining them with direct checks and continuing to monitor the relationship.
Workforce Assured accreditation is most useful when it forms part of that wider process.
What Sterling’s Workforce Assured accreditation demonstrates
Sterling Solutions Umbrella Limited, Sterling Solutions Rail Limited and Sterling CIS Limited have achieved Workforce Assured accreditation.
For The Sterling Group, this is not simply a marketing statement. It provides independent recognition of the systems, controls and standards that sit behind our services.
It demonstrates our willingness to have those standards examined rather than asking agencies and clients to rely solely on what we say about ourselves.
That distinction matters.
Recruitment agencies need payroll partners that understand the pressure they face. They must protect workers, meet client expectations, maintain clear records and manage an increasingly complex compliance environment.
Our Workforce Assured accreditation supports the evidence agencies need when assessing their supply chain. It sits alongside our commitment to clear communication, accountable processes and doing things properly at every stage of the contractor journey.
The commercial value of choosing partners that can provide evidence
Compliance failures rarely remain confined to the payroll department.
They can lead to financial exposure, disrupted contractor relationships, difficult client conversations and damage to an agency’s reputation.
The reverse is also true.
A well-managed and transparent payroll partnership can support:
- Stronger contractor confidence
- More effective client procurement conversations
- Clearer audit trails
- Fewer surprises within the supply chain
- Better-informed supplier decisions
- Greater confidence when reviewing a PSL
Evidence gives agencies a firmer foundation for those decisions.
It helps compliance teams demonstrate why a provider was selected. It allows account teams to answer client questions more confidently. It also shows contractors that the businesses responsible for their employment and pay have been chosen carefully.
That is why independently assessed standards matter commercially, not only operationally.
Frequently asked questions
What does Workforce Assured accreditation mean?
Workforce Assured accreditation provides independent recognition that an organisation has been assessed against a standard focused on temporary labour and employment practices. It is intended to support legal compliance, governance and better practices within labour supply chains.
Does Workforce Assured accreditation replace agency due diligence?
No. Agencies should continue to carry out their own checks on umbrella companies and other labour supply chain partners. Accreditation can provide valuable supporting evidence, but it should form part of a wider, ongoing due diligence process.
Why is Workforce Assured relevant to recruitment agencies?
Recruitment agencies need to understand how workers are engaged and paid throughout their supply chains. Workforce Assured accreditation gives agencies additional independent evidence when assessing the standards, governance and compliance approach of a potential partner.
Can an agency be liable for unpaid PAYE?
Under the rules in force from 6 April 2026, the agency with the direct contract to supply a worker to the end client is responsible for making sure the umbrella company operates PAYE correctly. HMRC can recover unpaid PAYE from that agency where the umbrella company has failed to pay the correct amount.
Which Sterling companies are Workforce Assured accredited?
Sterling Solutions Umbrella Limited, Sterling Solutions Rail Limited and Sterling CIS Limited have achieved Workforce Assured accreditation.
Choose compliance that can be evidenced
Agencies should not have to choose payroll partners based on promises alone.
In a market where responsibility is increasing and supplier decisions can carry significant financial and reputational consequences, evidence matters.
Workforce Assured accreditation gives agencies another independent source of confidence when assessing payroll and workforce providers. It shows that compliance standards have been opened to scrutiny and assessed against defined expectations.
It is not a replacement for robust due diligence. It is evidence that can make that due diligence stronger.
The Sterling Group is proud to be Workforce Assured accredited and to give agencies greater confidence in the processes behind our umbrella, rail and CIS services.
To discuss your current payroll arrangements, review your Preferred Supplier List or learn more about our Workforce Assured accreditation, contact The Sterling Group.
