Why might an umbrella company fail to pay its total tax bill to HMRC?

Broadly, there are three reasons a tax bill might not get paid by an umbrella company to HMRC.

1. Deliberate tax avoidance

   The umbrella is knowingly operating a scheme designed to reduce the tax that should be paid — the sort of scheme that ends up ‘named and shamed’ by HMRC on its “Current list of named tax avoidance schemes, promoters, enablers and suppliers.”

2. Cash flow crisis

   The umbrella is unable to meet its total tax liabilities to HMRC despite not having set out to avoid them.

3. Genuine mistake

   The umbrella made an honest error in calculating or paying the correct amount to HMRC.

For contractors and other affected parties, the third scenario of why an umbrella company ends up underpaying its HMRC liabilities will be less concerning than the first two, writes Andy Chamberlain, head of strategic policy and advocacy at the Freelancer & Contractor Services Association (FCSA).

Why does it matter which of the three umbrella tax underpayment reasons are in play?

It’s now four months since HMRC’s Joint & Several Liability (JSL) legislation came into force for contractor umbrella companies and their clients.

JSL lets HMRC pursue unpaid PAYE and NICs from further up the supply chain — the recruitment agency, the MSP or the end-client.

However, JSL doesn’t treat all three umbrella underpayment tax scenarios the same way, so it’s worth establishing which one applies when an umbrella falls short of what it owes to HMRC.

Under JSL, is a genuine mistake treated the same as tax avoidance?

No. If an otherwise compliant umbrella makes an administrative or accounting error, HMRC is unlikely to treat it the way it treats deliberate avoidance.

JSL gives HMRC the power to seek missing tax from further up the chain, but initially at least, the tax authority is unlikely to do so over a straightforward error. Instead, HMRC can point out the discrepancy and, all being well, the matter of underpayment gets corrected and settled there and then.

Under JSL, how is deliberate tax avoidance treated?

Deliberate tax avoidance is a different animal as far as the JSL rules of 2026/27 are concerned.

Deliberate tax avoidance is the very reason JSL was built, even though HMRC stopped short of saying so explicitly in its exclusive sit-down with ContractorUK, when asked about “deliberate non-compliance to shift liability.”

However, both recruitment agencies and end-clients should have taken reasonable steps in the first place to establish that an umbrella isn’t operating a tax avoidance scheme before they started working with it. That’s despite HMRC itself confirming, a little paradoxically, that JSL liability “will arise for relevant parties regardless of whether due diligence has been undertaken.”

Under JSL, what if an umbrella runs out of money?

This is the harder case, and the one that generated most of the anxiety when JSL was introduced on April 6th 2026: an umbrella can have a genuine tax liability but find itself unable to pay it because of a sudden cash flow crisis or insolvency, and under JSL, the consequences can reach up the supply chain even where the agency or client did nothing wrong.

Umbrella companies not being able to pay their tax bills (at least according to HMRC’s calculations) isn’t hypothetical in 2026/27, as three umbrellas recently found themselves under winding-up petitions where the Solicitor to HMRC was the petitioner.

[Editor’s Note: On July 29th 2026, a fourth umbrella company, Umbrella Guru Ltd, was placed under a winding-up petition by HMRC.]

However, the question of whether agencies and end-clients would decide that HMRC risk under JSL was simply too great, with the effect that they’d stop using umbrella companies altogether, appears to have been answered. In fact, so far there’s little sign of that stoppage happening on any meaningful scale, despite the prospect of an unexpected and potentially very substantial tax bill landing on their doorstep.

How has due diligence changed since JSL?

What’s changed isn’t necessarily the appetite for using umbrellas, but how agencies and clients select them. Preferred Supplier Lists have tightened, and agencies are carrying out more forensic checks on their umbrella partners — understandably so, given JSL.

There’s been a concentration of business among larger umbrellas with strong, established reputations for compliance — probably the most visible shift of its kind we’ve seen since FCSA was set up in 2008.

A natural response to JSL? Perhaps. After all, prudent agencies and clients now have an additional reason to understand exactly who sits in their supply chain and how that business operates.

Has JSL made it harder for smaller umbrellas to compete?

At the same time, smaller and newer umbrella providers may have found it harder to hold PSL places because PSLs have become more tightly controlled and risk-averse.

But this should not be interpreted as meaning that smaller umbrellas cannot succeed, and indeed we expect to see these tighter PSLs loosen, as the market adjusts to the new paradigm. In fact, already we’re seeing that smaller, younger umbrella companies that are well run, transparent and demonstrably compliant are performing well.

Has JSL pushed rogue operators out of the market?

Perhaps the most encouraging sign is JSL’s effect on the rogue end of the contractor umbrella company market, where operators presenting themselves as compliant umbrellas have long run tax avoidance schemes — undercutting legitimate providers and leaving contractors with the tax bill once the operator disappears.

Agencies that understand JSL have little incentive to work with an umbrella that could ultimately create a liability for them, which changes the economics of that model. It’s too early to declare victory — determined tax avoiders are inventive — but the early direction bodes well.

So, four months on — can you trust the umbrella you’re using?

JSL hasn’t undermined the use of umbrella companies, and it was never going to solve every reason an umbrella fails to pay its tax — only one of the three.

What it has done is change the question contractor recruitment agencies and end-clients ask from “Is this umbrella merely available and competitive?” to “Can we trust it?” Understanding which of the three reasons you’re actually managing against — avoidance, insolvency, or error — is what makes that due diligence meaningful rather than a box-ticking exercise.