Umbrella companies: from overarching contracts to joint and several liability

An umbrella company employs a temporary worker under a single continuing contract and supplies them to agencies and clients on a series of assignments, invoicing the agency, deducting employment taxes and paying the worker a salary. The model existed before IR35 but grew with it: a contractor who could not or would not run a limited company inside the rules had, from 2000, an employer of convenience.

Growth and the expense years

Through the 2000s the umbrella's selling point was expenses. Because the overarching contract treated each assignment site as a temporary workplace, the worker could claim tax relief on home-to-site travel that a permanent employee could not. The managed service company rules of 2007 pushed the composite company market into umbrellas and made the sector a fixture of the supply chain. The Treasury's discussion paper of December 2014 put the cost of the travel relief at £400 million a year, and from April 2016 relief was removed for workers under supervision, direction or control. The archive's coverage of that argument, and of the umbrellas that responded with salary-sacrifice and offshore structures, runs through the middle of the decade.

After the off-payroll reforms

The 2017 and 2021 off-payroll reforms sent tens of thousands of contractors into umbrella employment, often on the instruction of clients who would no longer engage personal service companies. The sector doubled and its compliance problems multiplied: mini-umbrella fraud exploiting the employment allowance and VAT flat rate, disguised remuneration schemes marketed as umbrellas, unlawful deductions and holiday pay withheld. The government promised regulation in 2021 and consulted in 2023. The Employment Rights Act 2025 brings umbrellas within the definition of employment businesses, to be enforced by the Fair Work Agency from 2027.

Joint and several liability, April 2026

The tax measure came first. From 6 April 2026, where an umbrella company in a labour supply chain fails to pay the PAYE and National Insurance due, HMRC can recover it from the agency that supplied the worker, and where there is no agency, from the end client. The liability is joint and several: it does not depend on the agency having done anything wrong, only on the umbrella having failed to pay. The Treasury expects the measure to raise £870 million by 2027 and £2.8 billion by 2031. Its effect on the market was immediate: agencies closed their preferred supplier lists to all but audited providers, contractors were moved between umbrellas, and new hybrid structures appeared that the Freelancer and Contractor Services Association asked the Chancellor to outlaw in its 2026 Budget submission.

What to check

A contractor choosing or being assigned an umbrella should check that it is independently assessed, that its payslip reconciles to the agency rate with every deduction shown, that holiday pay is paid rather than rolled up and retained, and that no part of pay is described as a loan, advance, grant or anything other than salary. The articles below cover the sector from its origins to the 2026 rules.