The landscape of the UK temporary labour market has undergone one of its most significant shake-ups in recent history. Effective from 6 April 2026, the UK Government introduced strict Joint and Several Liability (JSL) provisions targeting non-compliance within the umbrella company sector.
At ADVANCE, we have digested the full scope of this legislation and analysed its wider implications for the market. Our insight is clear: if you are a recruitment agency, a Managed Service Provider (MSP), or an end-client, the days of “what I don’t know won’t hurt me” are officially over. Under these rules, a hands-off approach to your supply chain could land you with a spectacular, and incredibly unwelcome, tax bill.
Below we have broken down exactly what Joint and Several Liability means, how it works, who is exposed, and—crucially—how you can protect your business.
How Does JSL Work?
At its core, Joint and Several Liability is a legal mechanism that allows HM Revenue and Customs (HMRC) to pursue multiple parties for the exact same debt.
Think of it like going out for a luxurious team dinner where one person orders the lobster, three bottles of expensive champagne, and then slips out the back door when the bill arrives. The restaurant doesn’t care who ate the lobster; they just want the bill paid, and they will hold anyone left at the table responsible for the total amount. Hopefully, you at least got a chip.
In the recruitment supply chain, if an umbrella company fails to account for and pay the correct taxes, the liability doesn’t just vanish into the ether with the rogue operator. Instead, JSL allows HMRC to move up the contractual chain to recover the outstanding balance from other parties.
Crucially, this operates on a strict liability basis. There is no statutory defence for “acting in good faith.” If the tax wasn’t paid by the umbrella company, HMRC can demand it from you, regardless of whether you knew about the non-compliance or not.
Who is Impacted by These Changes?
The Tax Information and Impact Note (TIIN) published by the government outlines that this legislation directly sweeps in approximately 30,000 recruitment agencies, 400 umbrella companies, and 700,000 temporary workers.
Our analysis highlights that the liability falls specifically depending on how your contractual chain is structured:
- Recruitment Agencies & MSPs: If a recruitment agency holds the direct contract with the end-client and engages an umbrella company, the topmost agency or intermediary in the chain inherits the financial risk. If there are multiple agencies, the liability generally lands on the intermediary closest to the end-client.
- End-Client Organisations: If there is no recruitment agency involved—meaning the end-client engages the umbrella company directly—the liability stops with the end-client.
- Umbrella Companies: Compliant umbrella companies actually welcome these rules. It levels the playing field by squeezing out rogue, non-compliant providers who undercut legitimate businesses by operating disguised remuneration or tax evasion schemes.
- Contractors and Workers: While workers are protected from rogue employers undercutting their basic rights, HMRC maintains the fundamental principle that individuals remain ultimately responsible for their own personal tax liabilities if they knowingly enter avoidance schemes.
How does this impact workers?
In response to the new legal mechanism, agencies will be solely responsible for guiding their workers to the most trusted and compliant umbrella company, in an effort to adhere to the new legislation and mitigate financial risk to the agency.
Although this may not affect new workers beginning employment, pre-existing workers may find their agencies re-establishing their Preferred Supplier List (PSL), introducing the risk that a worker’s chosen payroll provider might not make the cut. In turn, this could require the worker to transfer providers, where they may see a difference with their margins deducted. These differences could mean that the compliant umbrellas on the updated PSL carry higher administrative costs in comparison to the non-compliant options previously used, resulting in a reduction in take-home pay.
Granted, pre-existing workers may find themselves switching to an umbrella company, with a higher marginal rate; however, workers should feel reassured by their agency’s PSL, knowing that the options provided are unequivocally the most compliant and trusted within the industry.
When Does HMRC Step In?
HMRC is projected to protect an estimated £715 million in tax revenue in the 2026–27 financial year alone through these measures. HMRC will step in and issue demands under JSL when an umbrella company fails to correctly remit:
- PAYE Income Tax
- National Insurance Contributions (NICs) — both employee and employer portions
- Student Loan repayments
Historically, HMRC also utilises Joint and Several Liability notices under the Finance Act 2020 against company directors. This occurs if individuals repeatedly and deliberately liquidate a company to escape tax debts, only to then start an identical one the next day.
Under the April 2026 rules, however, HMRC does not need to wait for an insolvency event to occur within the supply chain. If the umbrella company runs its payroll and fails to pay the correct tax to HMRC on time, the liability immediately triggers for the relevant agency or end-client.
Due Diligence Is Your Responsibility
Because the legislation does not prescribe a specific, statutory due diligence checklist, the burden of proof rests entirely on the agency or Managed Service Provider (MSP). To avoid a catastrophic tax demand, your organisation must transition from “trust-based” relationships to a rigorous verification framework. From our perspective, we advise focusing on three core areas:
1. Independent Accreditations
The Freelancer & Contractor Services Association (FCSA) represents the gold standard of independent compliance in the sector. FCSA-accredited umbrella companies undergo rigorous, independent annual audits (conducted by top-tier accountancy and legal professionals) to ensure their payroll processing, tax treatments, and contractual structures align perfectly with HMRC guidelines.
2. Move Beyond Annual Audits
An annual check is no longer sufficient; a week is a long time in tax compliance, and a rogue umbrella can cause a lot of damage in 12 months. (It turns out ‘trust me, I’m an umbrella company’ is no longer an acceptable compliance strategy). Implement real-time or monthly automated payslip verification tools (such as SafeRec) to verify that the deductions shown on contractor payslips match the Real Time Information (RTI) submissions sent to HMRC.
3. Maintain a Strict Preferred Supplier List (PSL)
Limit your consultants to a heavily vetted, transparent PSL. Your contracts with these providers should include robust indemnity clauses, clear right-to-audit provisions, and full transparency regarding assignment rates, margins, and holiday pay calculations.
Summary Checklist for UK Businesses
Based on our digestion of the JSL guidelines, we recommend executing the following four actions immediately:
- Map your entire temporary labour supply chain to identify every umbrella entity.
- Review and update contracts to include watertight JSL indemnities.
- Restrict the PSL exclusively to FCSA-accredited or independently audited partners.
- Establish a continuous, monthly payroll and RTI verification process.
The implementation of Joint and Several Liability marks a permanent shift toward transparency. By partnering exclusively with compliant, accredited umbrella providers and treating supply chain auditing as a core business function, you can safeguard your commercial reputation and ensure your business remains completely secure.
