Payroll Outsourcing UK 2026: Costs, Options & Rules

Payroll outsourcing means handing payroll processing — PAYE, National Insurance, pensions, payslips and HMRC reporting — to an external provider. UK businesses typically pay £4–12 per payslip for bureau services or 2–5% of payroll for fully managed service, cutting processing errors and freeing roughly one day per month per 50 employees.

Payroll outsourcing is the first back-office function most UK companies hand over, and 2026 gives two fresh reasons: employer National Insurance at 15% has tightened cost control, and the new joint-and-several liability (JSL) rules make agencies directly liable for unpaid PAYE in their labour supply chains. This guide compares payroll outsourcing services, umbrella employment and Employer of Record, with costs and a provider checklist.

What does payroll outsourcing include?

A payroll outsourcing provider calculates gross-to-net pay, files RTI submissions to HMRC, produces payslips, P45s and P60s, administers auto-enrolment pensions and statutory payments (SMP, SSP), and keeps you aligned with April rate changes. Fully managed services add year-end reporting, benefits (P11D) and employee queries.

The practical dividing line is who owns exceptions. A payroll bureau processes what you send; a managed service also chases the missing starter forms, applies the correct statutory payments and answers employees directly. In the payrolls we take over, around 80% of historic errors trace back to exceptions nobody owned — new starters, leavers and statutory pay — not to the calculations themselves.

Payroll outsourcing vs umbrella vs EOR: which model fits?

Three models get mixed up constantly, and choosing the wrong one is expensive:

Model	Who employs the worker	Best for	Typical cost (2026)
Payroll outsourcing (bureau/managed)	You remain the employer	Companies with UK entity and permanent staff	£4–12/payslip or 2–5% of payroll
Umbrella company	The umbrella employs the contractor	Agency contractors inside IR35	£15–30/week margin
Employer of Record (EOR)	The EOR is the legal employer	Hiring in the UK (or abroad) without an entity	£200–500/employee/month

If you engage contractors through umbrellas, 2026’s JSL rules mean HMRC can pursue the agency or end client for an umbrella’s unpaid PAYE — vetting the payroll partner is now a legal safeguard, not due diligence theatre. What is an umbrella company in this chain? The employer that runs PAYE on the contractor’s assignment income; see our separate guide on choosing one, and why ‘best umbrella company uk’ lists should be read with the fee structure open.

How much does payroll outsourcing cost in the UK?

Pricing scales with headcount and service depth. Bureau processing for a 25-person company runs £150–300 per month; fully managed payroll for the same team £300–600; add auto-enrolment administration (£1–2 per payslip) and year-end P11Ds. Against that, an in-house payroll administrator costs £28,000–35,000 a year plus software — the break-even sits around 80–120 employees, which is why most SMEs outsource and most agencies also outsource contractor payroll rather than run it internally. Contractor management software helps with onboarding and timesheets, but it does not carry liability for the deductions — a provider does.

How to choose a provider: a six-point checklist

Compliance accreditation: FCSA or SafeRec accreditation for umbrella work; ISO 27001 for data.
Transparent per-payslip pricing with statutory payments and RTI included, not billed as extras.
Named payroll contact and a service-level agreement on error correction (24–48 hours).
International capability: if you hire abroad, one provider covering UK payroll and overseas EOR beats stitching vendors per country.
JSL-proof audit trail: for agencies — evidence of PAYE remittance you can show HMRC.
Employee self-service for payslips and P60s, so queries do not land on your HR team.

Summary — key takeaways

Payroll outsourcing in the UK costs £4–12 per payslip (bureau) or 2–5% of payroll (managed); break-even vs in-house sits around 80–120 employees.
Match the model to the worker: outsourced payroll for your employees, umbrella for inside-IR35 contractors, EOR when there is no UK entity.
The 2026 JSL rules make agencies liable for unpaid PAYE in the chain — provider vetting is now a legal necessity.
Prioritise accreditation, transparent pricing and an audit trail over the cheapest per-payslip quote.

FAQ

What is payroll outsourcing?

Payroll outsourcing is contracting an external provider to run some or all of your payroll: gross-to-net calculations, PAYE and National Insurance, pension auto-enrolment, payslips and HMRC real-time reporting. You stay the employer; the provider executes the process. It differs from an umbrella or EOR, where the provider actually employs the workers.

How much does payroll outsourcing cost in the UK?

Payroll outsourcing costs in the UK typically range from £4–12 per payslip for bureau processing to 2–5% of total payroll for fully managed service. A 25-person company should budget £150–600 a month depending on depth. Set-up fees of £200–500 and P11D year-end work are the usual extras to confirm upfront.

Payroll outsourcing vs Employer of Record — what is the difference?

Payroll outsourcing processes pay for staff you employ through your own entity. An Employer of Record legally employs the workers for you — used when you have no local entity or want to remove employment risk. If you are a UK company paying UK staff, you need payroll outsourcing; if you are hiring in the UK from abroad, you need an EOR.