Two months after the Joint and Several Liability rules came into force, the first schemes promising to make umbrella tax liability “disappear” are being actively marketed across the labour supply chain. HMRC’s response arrived quickly — and it begins with the words “tax fraud warning”. Here’s what contractors and recruitment agencies need to know.

When the Joint and Several Liability (JSL) rules took effect on 6 April 2026, we said the compliance game had changed: if an umbrella company fails to pay the PAYE and National Insurance due on its workers’ pay, HMRC can now recover that debt from the recruitment agency — or the end client where there’s no agency in the chain.

Predictably, an industry of “solutions” has sprung up promising to make that risk vanish. The most prominent involves something called a Bill of Exchange — and on 13 May, HMRC published an official briefing rejecting it in the strongest terms it uses.

You can read HMRC’s briefing, “Tax fraud warning: attempts to use ‘Bills of Exchange’ to pay HMRC”, on GOV.UK.

What is a Bill of Exchange?

Strip away the jargon and a Bill of Exchange is a written instruction telling one party to pay a set sum to another — essentially an IOU with legal formatting. The model dates back centuries and is governed by the Bills of Exchange Act 1882. It still has legitimate uses in international trade.

What it is not — and never has been — is a way of paying tax. Receiving a Bill of Exchange doesn’t oblige anyone to accept it. And HMRC doesn’t.

The pitch being made right now

Promoters, particularly in the labour supply sector, are marketing arrangements in which an umbrella company’s PAYE, NIC and sometimes VAT liabilities are “settled” by a third party using a Bill of Exchange rather than actual money. The sales material often claims the arrangements are accepted or unchallenged by HMRC, or that they’ve been approved by a King’s Counsel.

HMRC’s briefing addresses those claims directly: they are false.

What HMRC actually says

Four points from the 13 May briefing are worth committing to memory:

• HMRC does not accept Bills of Exchange, promissory notes or similar private instruments as payment of any tax liability.
• PAYE, NIC, VAT and other liabilities must be paid using recognised methods — bank transfer or direct debit.
• If a business relies on a Bill of Exchange instead of paying properly, HMRC treats the tax as unpaid. Interest and penalties continue to accrue while enforcement escalates.
• HMRC’s recovery powers are extensive: debt collection, enforcement visits, winding-up petitions and, in serious cases, insolvency or bankruptcy proceedings.

In short: if the payment only exists on paper, the liability still exists in reality.

Why this matters so much under JSL

Here’s the part that should focus minds across the supply chain. Under the JSL rules, HMRC does not need to prove an agency or end client did anything wrong before pursuing them — there simply has to be an unpaid PAYE liability somewhere in the chain.

So if an umbrella company’s tax has been “settled” with an instrument HMRC won’t accept, that liability is sitting unpaid — and it can move up the chain to the agency or end client, typically landing on the most solvent party. Umbrella directors can also face personal liability, and where VAT is involved, HMRC’s “knew or should have known” test puts anyone who ignored red flags in difficulty.

Legal commentators have described the potential result as a domino effect of PAYE, NIC and VAT exposure spreading across multiple parties — see Chartergates’ analysis on ContractorUK.

What contractors should watch for

Trade press reports suggest HMRC’s warning is aimed at a market of around 700,000 umbrella workers. If you’re one of them, the risk is straightforward: if the tax on your earnings hasn’t genuinely been paid, history shows the fallout tends to reach the worker eventually — often as a large, unexpected tax bill.

Be cautious if:

• your take-home pay seems higher than other umbrellas quote for the same rate — someone is paying for that, and it may be you, later;
• your provider mentions Bills of Exchange, promissory notes or third-party “settlement” of tax;
• a scheme is described as “HMRC approved” — HMRC does not approve schemes;
• you can’t clearly see PAYE and NIC being deducted and reported on your payslip.

If any of that sounds familiar, ask questions — and for complex situations, seek professional tax advice.

What agencies should do

The Bills of Exchange episode is the clearest demonstration yet of why due diligence under JSL has to be continuous rather than annual. An umbrella that passed a paperwork review in January can adopt a scheme like this in May — and the liability won’t wait for your next review cycle.

Three practical defences:

• Independent, ongoing verification. SafeRec certification means every payslip is audited weekly by an independent third party, with reports available to agency partners — standing evidence that PAYE is actually being paid, not a snapshot.
• Ring-fenced PAYE. Our Vault service separates PAYE liabilities into a dedicated account, so you can see exactly what’s owed and when it’s paid to HMRC — removing the risk of funds being diverted along the way.
• Healthy scepticism. If a provider’s commercial offer only makes sense because of how it handles tax, that’s not a competitive advantage — it’s a liability with your name on it.

The bottom line

There is no shortcut around paying tax properly. JSL was designed to flush non-compliance out of the labour supply chain, and HMRC’s rapid, unambiguous response to the first “workaround” shows how it intends to police the new rules — in its own words, with no light touch.

A compliant umbrella pays HMRC in full, on time, and can prove it. At PayGuardians, that proof is independent: every payslip we produce is audited weekly through SafeRec, and every party in the supply chain can see the numbers.

If you’ve been pitched an arrangement that sounds too clever to be true — or you’d like to see what weekly audit evidence looks like — get in touch with the team.

This article is general information, not legal or tax advice. For advice on your specific circumstances, please speak to a qualified professional.

Sources

• HMRC issue briefing: Tax fraud warning — attempts to use ‘Bills of Exchange’ to pay HMRC (13 May 2026)
• GOV.UK: PAYE rules for labour supply chains that include umbrella companies (from 6 April 2026)
• ContractorUK / Chartergates: What are Bills of Exchange, and should HMRC’s alert worry umbrella contractors? (3 June 2026)