Who JSL Really Affects

Since April 2026 was announced, the recruitment and payroll sector has been saturated with commentary treating Joint and Several Liability as an unprecedented event. Guides, webinars and legal briefings have converged on the same message: the rules have fundamentally changed, the risk is enormous, act immediately or face catastrophic consequences.

Some of that is true. A good deal of it is not. The part most consistently missing from the conversation: for businesses that have always taken their supply chain seriously, almost everything Chapter 11 demands was already in place.

HMRC is Clamping Down on Non-Compliant Umbrella Payrolls

The idea that HMRC was previously powerless to recover unpaid tax from anyone beyond the non-compliant umbrella is simply not accurate.

Under Chapters 8 and 10 of ITEPA, debt transfer provisions already allowed HMRC to move a tax liability up the supply chain. Under Section 44, the agency deeming rules could already make an agency the deemed employer for tax purposes in certain configurations. Schedule 13 of the Finance Act 2020 already made directors personally jointly and severally liable for unpaid tax in phoenixing situations. And the Kittel principle, drawn from VAT fraud case law, already established that proximity to fraud in a supply chain creates exposure even without direct involvement.

None of these were theoretical. HMRC used them.

What Is Actually New

Chapter 11 introduces three genuine changes rather than simply restating existing law.

The first is consolidation. Instead of navigating between debt transfer rules, deeming provisions and fraud assessments, HMRC now has a single defined framework for umbrella arrangements with a clear relevant party hierarchy.

The second is the removal of all defences. Previous mechanisms had conditions attached. Chapter 11 has none. Liability is automatic the moment an umbrella defaults, regardless of what the agency or client knew, intended or checked. This is the meaningful change. Not the existence of liability, but the impossibility of contesting it.

The third is the closure of the fraudulent documents defence. Under prior agency legislation, a business could argue it had been genuinely misled by fraudulent payslips or compliance certificates. That argument is now expressly shut off.

The Real Purpose

The government has been explicit. Chapter 11's stated aim is to give businesses "a financial stake in the compliance of the umbrella companies they use." This is not primarily about creating new liability. It is about eliminating the commercial incentive to look away.

And looking away has been surprisingly common. Many end clients have historically treated payroll as someone else's problem. A back-office function delegated to an agency, with little interest in what happened further down the chain. As long as workers turned up and invoices were paid, the question of how those workers were being taxed rarely surfaced in commercial conversations.

That position is no longer tenable. Chapter 11 is specifically designed for the business that knew, or could reasonably have known, that its supply chain had a compliance problem, and chose not to ask. The strict liability position means that the old defence of ignorance, deliberate or otherwise, simply no longer works.

Who JSL Really Affects

Businesses with genuinely transparent supply chains, agencies on vetted preferred supplier lists, and payroll providers that can demonstrate real-time compliance: April 2026 changes very little in practice.

The legislation lands hardest on a specific type of client: one that has been drawn to agencies offering unusually low margins or workers with unusually high take-home pay, without questioning how either was achievable. Competitive pricing in a compliant payroll market has defined limits. When those limits are exceeded, something else is happening, and the business benefiting from it is now, under Chapter 11, financially exposed to the consequences.

Put plainly: if your supply chain has been too good to be true, April 2026 is the point at which that catches up with you.

The Infrastructure Was Already the Answer

The tools that protect clients under Chapter 11 (verified payroll compliance, independently confirmed PAYE remittance, transparent gross-to-net calculations) are the same tools that have always distinguished responsible businesses from those cutting corners. Chapter 11 has not invented the standard. It has made ignoring it expensive.

Verifying payslips against HMRC RTI data isn’t a new approach for us.  Verifiable compliance is what a trustworthy payroll provider should always have been able to demonstrate. It’s one of the fundamental principles that we’ve followed since we founded in 2009. Transparency and visibility to clients and workers alike is the bare minimum as far as we’re concerned. 

If you have been asking the right questions of your supply chain, April 2026 holds no surprises. If you have not, now is the time to start.