IR35, Umbrella Companies, and the Shifting Contractor Landscape in 2025

For white-collar professionals in construction, the contractor market has never been easy to navigate. But in 2025, changes to off-payroll working rules, umbrella company oversight, and compliance enforcement are reshaping how both candidates and employers approach hiring.

IR35 has been around for years, but the practical impact of reforms from 2021 and more recent developments in umbrella regulation have added new complexity. Clients and contractors alike are looking for clarity, especially as demand fluctuates across infrastructure, build, and retrofit projects.

Here is what has changed, what is still uncertain, and what construction professionals should be thinking about now.

The Basics: What IR35 Is and Why It Matters

IR35 is HMRC’s legislation aimed at identifying “disguised employment.” It applies to individuals who work via their own limited companies (often called Personal Service Companies or PSCs) but who operate in a way that is effectively the same as a direct employee.

The goal is to ensure that those working in this way pay broadly the same income tax and National Insurance as an equivalent permanent employee.

Under reforms rolled out in 2021, the responsibility for determining IR35 status shifted from the contractor to the end client in most cases. This applies in both the private and public sectors where the end client is a medium or large business.

The client must assess whether a contractor is genuinely self-employed or falls inside IR35, meaning they are deemed employed for tax purposes. If the contractor is inside IR35, tax and NI must be deducted at source.

For many in construction, this changed the way contractor assignments are reviewed, costed, and onboarded.

Umbrella Companies: From Loophole to Risk Area

As more contractors found themselves classed as inside IR35, many moved to work through umbrella companies. These act as intermediaries that technically employ the worker, deduct tax and NI, and then pay the net amount to the individual.

In theory, umbrella companies provide simplicity. But in practice, the market has been difficult to regulate.

Some umbrella companies have operated non-compliant schemes, offering inflated take-home pay through disguised remuneration or off-payroll arrangements that avoid proper deductions. This not only exposes workers to future HMRC penalties but also puts employers at risk of reputational and financial damage.

In recent years, HMRC has stepped up its oversight. The government confirmed in 2023 that it would bring forward new rules for umbrella company regulation. By mid-2025, further draft legislation is expected to formally introduce a licensing system or fit-and-proper standards for umbrellas.

Compliance Pressure Is Increasing for Clients

A key shift in 2025 is the increased emphasis on client-side compliance. HMRC is auditing more organisations around their use of PSCs and umbrellas, particularly where off-payroll workers make up a significant portion of the workforce.

While many large contractors have implemented robust status determination processes using tools like CEST (Check Employment Status for Tax), grey areas remain. Some clients are now facing retrospective reviews of their determination processes or third-party labour supply chains.

This is particularly relevant in infrastructure and large-scale retrofit projects, where site teams often include dozens of contract staff across planning, health and safety, document control, and site management roles.

Getting IR35 wrong can lead to tax bills, interest, and penalties. This has pushed some clients to take a more risk-averse approach, insisting on PAYE-only engagement models or direct employment contracts.

What This Means for Contractors

From the contractor’s perspective, the environment is more cautious than it was five years ago. Many professionals who used to operate through limited companies have shifted to umbrella or PAYE options, particularly when working with larger clients who want certainty.

Some contractors still operate outside IR35 on projects where they control their own time, tools, and risk. But these roles are less common and often subject to rigorous contract reviews. In construction, where delivery models are layered with subconsultants, delivery partners, and multiple interfaces, the argument for genuine self-employment is harder to sustain.

Contractors should also be cautious of umbrella companies promising unusually high take-home pay or complex tax-saving schemes. These are increasingly under scrutiny. In 2024, HMRC launched targeted campaigns to alert individuals who may have unknowingly engaged in disguised remuneration schemes between 2018 and 2022.

Being confident that your umbrella company is fully compliant is now as important as reviewing your contract terms. Professional bodies and recruitment agencies are encouraging contractors to ask for payslip breakdowns, clarity on employment rights, and evidence of proper deductions.

What Employers and Clients Should Consider

From the client side, the focus in 2025 is on due diligence and documentation.

• Status Determination Statements (SDS) must be accurate, based on current working practices, and communicated clearly to both the contractor and any supply chain partners.
• Contracts must reflect the reality of the engagement. If a contractor is embedded within a delivery team, under direction and working fixed hours, it is likely they fall inside IR35.
• Umbrella supply chains must be reviewed. Using a compliant umbrella company does not fully remove liability if HMRC later identifies non-compliance. End clients are being advised to audit umbrella partners and use accredited providers.

Clients should also consider the impact of overly cautious hiring strategies. While blanket bans on PSCs or umbrellas may reduce risk, they can also limit access to skilled professionals who prefer flexibility or short-term roles. Balancing compliance with workforce agility is key.

Signs of Change: What Might Be Coming Next

While the current rules are in place, there have been ongoing calls from industry bodies for further simplification. In late 2024, the Treasury confirmed it would consult on ways to reduce admin and increase clarity around off-payroll working, especially for smaller businesses.

One proposal under review is whether umbrella companies should be brought under the same tax rules as direct employers, creating clearer lines of responsibility. There is also a growing push for a central register of umbrella companies, so that clients and workers can verify compliance.

For now, no major overhauls have been confirmed. But change remains on the agenda, and both clients and contractors should stay informed.

Final Thoughts

In 2025, IR35 is no longer just a tax rule sitting in the background. It affects how contractors are engaged, how projects are staffed, and how risks are shared across supply chains.

For white-collar professionals in construction, particularly those working on frameworks, high-rise developments or retrofit schemes, clarity about engagement terms and payment models is essential.

For hiring teams, working with trusted partners, keeping documentation accurate, and reviewing your supply chain are practical ways to stay compliant without narrowing your candidate pool unnecessarily.

At Warwick Callow, we support both clients and professionals in navigating the realities of modern hiring. Whether you need guidance on compliant contractor models or are a professional looking for clarity in how you work, we are here to help.

If you would like to discuss IR35, umbrella compliance, or contract hiring in your organisation, feel free to get in touch.