CIS compliance: why finance leaders cannot afford to get employment status wrong

For many CFOs and Finance Directors in construction, the pressure to deliver projects on time and on budget is constant. Against that backdrop, decisions around worker engagement and employment status determinations can sometimes rely on habit, market norms or commercial urgency.

But when it comes to the Construction Industry Scheme (CIS), those shortcuts can come at a cost.

Misclassifying workers as self-employed is no longer a grey area. HMRC expectations are clear, enforcement is tightening, and the financial and reputational impact of getting it wrong can be significant. In our whitepaper, we set out what finance leaders need to know and, more importantly, what they need to do next.

The CIS myth that continues to create risk

There are several myths linked to CIS that pose a significant risk to businesses. A common misconception, for example, is that CIS is simply a payment method. In reality, it is closely tied to employment status, which must be determined correctly before any payment route is chosen. There’s also a risk that CIS is used based on custom and practice rather than evidence. For example:

• A belief that CIS workers are more productive or easier to source
• Assumptions that PAYE talent is not available
• Commercial pressure to reduce employment costs

While these may feel like practical business decisions, they do not align with HMRC criteria, which not only exposes employers and finance teams to non-compliance, but also creates a growing gap between what businesses are doing and what compliance requires.

Why the stakes are higher than ever

Getting employment status wrong is not just a technical error that can be resolved and forgotten easily. In fact, it creates real exposure at multiple levels, including:

• Tax liabilities and unpaid National Insurance contributions
• HMRC penalties and fines
• Contractual breaches with clients and suppliers
• Reputational damage linked to perceived tax avoidance

For finance leaders, this is not just an operational issue, it is a governance and risk management priority that requires clear oversight and robust processes.

The critical role of SDS and CEST

One of the most overlooked aspects of CIS compliance is the requirement for formal status assessment. There are two key mechanisms that form the backbone of any defensible approach:

Status Determination Statement (SDS)

When working through an employment business, the responsibility sits with the hirer. If your business has supervision, direction and control over the worker, you must produce a clear, auditable determination.

Check Employment Status for Tax (CEST)

When engaging workers directly, the assessment must be carried out internally, using HMRC’s approved tool. The output is only valid if the inputs are accurate and reflect real working practices.

What becomes clear is that this is not a one-off exercise. Determinations must be revisited as roles evolve, locations change or responsibilities within the workforce shift. Without a clear audit trail, the burden of proof sits firmly with the hirer.

A reality check for construction finance teams

Based on decades of experience across the UK construction sector, one finding stands out.

When assessed properly, very few semi-skilled, skilled or supervisory workers meet the criteria for genuine self-employment under HMRC rules.

That insight alone raises important questions for finance teams currently relying on CIS at scale. How many of those decisions would stand up to scrutiny? And what would the financial impact be if they did not?

Moving from risk to control

The good news is that this is a manageable challenge with the right approach. Effective businesses are already introducing stronger gatekeeping processes, ensuring that:

• Employment status is assessed before engagement, not after
• Payroll or finance teams take ownership of compliance checks
• Every determination is documented and auditable
• PAYE is the default unless self-employment is clearly justified

These steps not only reduce risk but also create greater confidence across finance, operations and commercial teams.

Ready to stress test your approach?

CIS compliance is no longer something that can sit in the background. It demands attention at board level, with clear accountability and consistent application. Our whitepaper unpacks the full process in detail, including where most businesses go wrong and how to align with HMRC expectations without slowing down delivery.

If you are responsible for financial oversight, workforce strategy or risk management in construction, it is essential reading.

Download the whitepaper to understand where your current approach may be exposed and what to do next.