If you are stepping into UK contracting in 2026, the first call you make is not about rates — it is about how you will be paid. PAYE, umbrella and limited-company routes each produce a different payslip, a different tax liability and a very different relationship with HMRC's off-payroll rules. This guide decodes the three models, walks through the maths on a £250-per-day assignment, and explains how IR35 reshapes the choice for most contractors on public- and private-sector roles.
Why the payment model matters more than the day rate
Two contractors on identical £250-per-day assignments can end the month £600 apart because of the vehicle they use. The difference comes from employer National Insurance, the apprenticeship levy, margins kept by intermediaries and — crucially — whether HMRC treats the engagement as inside or outside IR35. Around 1.9 million UK workers are engaged on contract terms in 2026, and the Treasury's tightening of off-payroll enforcement means the paperwork matters as much as the rate.
PAYE: the simplest, lowest-admin option
Pay As You Earn is HMRC's default machinery for taxing employed income. When a recruitment agency or end client engages you directly on a PAYE basis, the employer deducts income tax and Class 1 National Insurance at source. You receive a payslip, a P60 at the end of the tax year and statutory benefits such as holiday accrual and pension auto-enrolment.
- No company to run, no annual accounts, no VAT returns.
- Employment rights apply from day one of the engagement.
- Gross-to-net take-home is transparent, but every deduction sits on the worker.
Umbrella companies: a third-party employer of record
An umbrella company employs you but invoices the end client or agency on your behalf. Your assignment rate lands at the umbrella first; the umbrella then strips out its margin, employer NI, the apprenticeship levy and pension contributions before running the remainder through PAYE. You become the umbrella's employee, not the client's.
- Continuous employment history across multiple assignments.
- Statutory Sick Pay and Statutory Maternity Pay accrue through the umbrella.
- Admin is outsourced, but the umbrella's margin and reconciliation errors eat into net pay.
Inside vs outside IR35: the rule that governs the choice
IR35 (Chapter 8 and Chapter 10 of ITEPA 2003) exists to stop deemed employees from being taxed as contractors. Since April 2021 in the private sector and April 2017 in the public sector, the end client, not the contractor, determines the status of the engagement. A Status Determination Statement (SDS) is issued and the fee-payer in the chain must deduct tax and NI at source if the role falls inside IR35.
- Inside IR35: PAYE or umbrella working is effectively compulsory.
- Outside IR35: A personal service company (PSC) is usually the most efficient route, but the client must evidence the decision.
- Small-client exemption: Private-sector clients classified as small under the Companies Act still leave the IR35 decision with the contractor.
The maths on a £1,250-per-week assignment
The best way to compare models is to run the same assignment through each one. The table below uses a £250-per-day rate paid over a standard five-day week.
| Line item | PAYE via agency | Umbrella (inside IR35) |
|---|---|---|
| Assignment rate | £1,250.00 | £1,250.00 |
| Employer NI (deducted before your tax) | Absorbed by agency | £138.79 |
| Apprenticeship levy | n/a | £5.46 |
| Umbrella margin | n/a | £12.50 |
| Gross taxable pay | £1,250.00 | £1,093.25 |
| PAYE income tax | ~£361.00 | £316.39 |
| Employee NI (Class 1) | ~£75.00 | £55.69 |
| Approximate net take-home | ~£814.00 | £721.17 |
The umbrella route nets roughly £90 less per week on this rate. That gap is the cost of continuous employment, outsourced admin and the flexibility of switching assignments without re-onboarding with each new agency.
Red flags when picking an umbrella company
HMRC has pursued hundreds of disguised-remuneration schemes over the past five years, and the 2019 Loan Charge showed how long such liabilities can follow a worker. Before you sign a Key Information Document, check the provider against all of these:
- FCSA (Freelancer & Contractor Services Association) accreditation or Professional Passport membership.
- Margin quoted in pounds, not as a percentage of assignment rate.
- No reference to a loan, annuity, trust, credit facility or overseas settlement as part of the net pay.
- Pay calculation matches the reconciliation statement week-on-week.
- Holiday pay shown as a ring-fenced accrual, not rolled into the rate.
Case study: a contract developer moves from PSC to umbrella
A backend developer in Manchester billed £500 a day through her own limited company for three years. In April 2026, her client re-classified the engagement as inside IR35 after the end client adopted new SDS templates. Rather than close the PSC, she switched to an FCSA-accredited umbrella for the 12-month renewal. Her net pay dropped by 14% compared with the outside-IR35 PSC route, but her monthly admin time fell from four hours to zero and her statutory rights kicked in from week one. Six months later she opened a separate outside-IR35 product-build project through the PSC for a small-client exempt start-up, running both engagements in parallel.
Frequently asked questions
Can I move between PAYE, umbrella and limited-company working in the same tax year?
Yes. HMRC treats each engagement on its own terms, provided each one is correctly classified and reported. The same Self Assessment will capture PSC dividends and any PAYE employment income.
Does an umbrella pay me if the client doesn't pay the agency?
Most umbrella contracts mirror the payment terms upstream, which means you can be left waiting if the agency delays its transfer. Always check the pay-when-paid clause in your contract.
Am I entitled to holiday pay under an umbrella?
You are. Under the Working Time Regulations 1998 you accrue 5.6 weeks per year. The umbrella must show the accrual as a separate line on your payslip rather than rolling it into your rate.
What happens if my client wrongly determines an inside-IR35 role as outside?
Since 2021, the liability for unpaid tax sits with the fee-payer in the chain, usually the end client or agency. As a contractor you should still keep copies of the Status Determination Statement and any disagreement correspondence.
Do umbrella workers qualify for auto-enrolment pensions?
Yes, once earnings exceed the auto-enrolment threshold (£10,000 a year in 2026) the umbrella must enrol you into a qualifying scheme such as NEST or The People's Pension.
Conclusion
Your payment model shapes every payslip, tax return and benefit claim of your UK contracting career. PAYE is clean and rights-rich. Umbrella companies buy you continuity across assignments at the cost of margin. A PSC still pays best when you are genuinely outside IR35 — but only when the evidence supports the status. Before you accept your next offer, explore open UK contract roles on ScrollJob UK and negotiate the payment vehicle alongside the rate.
