Payroll Outsourcing Costs: UK Pricing Guide

How payroll outsourcing pricing works

Before looking at specific numbers, it helps to understand what you're actually buying, because the service level shapes the price at least as much as your headcount does.

 

Fully managed, bureau or software-only: what you're paying for

The terminology can get hazy here, and providers don't always use the same labels. At the risk of oversimplifying, outsourced payroll broadly falls into three models:

Fully managed payroll means the provider runs the entire payroll operation on your behalf. They collect and validate your data, calculate gross-to-net, handle HMRC Real Time Information (RTI) submissions, manage auto-enrolment, produce payslips, process year-end and field employee queries. You retain sign-off and control, but the processing, compliance and expertise sit with them. This is the most comprehensive (and typically the most expensive) model.

Bureau payroll is a step back. The provider processes the payroll, but you're responsible for submitting the input data in a defined format and often for handling employee queries yourself. Bureau pricing tends to be lower because the provider does less, but you're absorbing more of the operational overhead internally.

Software-only is exactly what it sounds like: you license a payroll platform and run everything yourself. The software handles calculations, RTI filing and reporting, but the knowledge, accuracy and compliance burden are yours. Pricing is usually a flat licence fee or a lower PEPM.

Why this distinction matters for cost: if you're comparing a fully managed quote at £10 PEPM against a bureau quote at £5 PEPM, you're not comparing like with like. The gap between them is the cost of the work your own team will need to do under the bureau model, and that internal cost doesn't appear on the provider's invoice.

 

Five pricing models compared

Within those service levels, providers structure their fees in several ways:

 

Model	Details
Per employee per month (PEPM)	Fixed fee per employee on your payroll each month. Typically used by most managed and bureau providers. Ask: does the rate include leavers and joiners processed mid-month?
Per payslip	Fee per payslip generated. One employee paid weekly = four payslips. Typically used by some bureau providers. Ask: how does the cost scale for weekly or fortnightly cycles?
Flat monthly fee	Fixed monthly charge regardless of headcount, usually up to a cap. Typically used by small employers, often up to 5–10 employees. Ask: what happens when you exceed the cap? Often reverts to PEPM.
Tiered pricing	PEPM rate varies by headcount band (e.g. 1–50, 51–250, 251+). Typically used by providers serving a range of business sizes. Ask: does the rate apply to the whole headcount or only employees within each band?
Hybrid	Base monthly fee plus a per-employee variable. Typically used by some providers targeting growing businesses. Ask: could the base fee make it expensive at low headcount?

 

PEPM is the dominant model for most employers and the easiest to compare across providers. If you're getting quotes in different formats, convert everything to a monthly cost per employee to compare fairly.

Hidden costs to ask about before you sign

The headline PEPM is rarely the full picture. Most providers are transparent about these costs, but they don't always volunteer them unless you ask.

 

The implementation fee

Implementation is often the single largest cost in year one, and the most commonly underestimated. It covers data migration from your current system, parallel running (processing payroll in both the old and new system simultaneously to verify accuracy), configuration, testing and training.

Implementation fees vary enormously depending on your complexity. A straightforward payroll might attract a one-off fee equivalent to two to four months of service charges. A complex migration involving multiple entities, historical data, integrations and bespoke reporting will cost more. Some providers amortise the fee across the first year of the contract; others charge it upfront.

What to ask: Does the quote include a dedicated implementation manager? How long is the parallel run? What happens if the implementation overruns: is the fee fixed or time-and-materials? Is training for your team included?

In our experience, the most common cause of implementation overruns is incomplete or inconsistent data from the outgoing system. Agreeing a clear data specification with your current provider early in the process saves time and cost further down the line.

 

Year-end, ad-hoc runs and the extras list

Beyond implementation, here are the line items that most often sit outside the base PEPM:

• Year-end processing. P60 production, P11D filing, PAYE Settlement Agreements (PSAs). Some providers include this; others charge separately.
• Ad-hoc or out-of-cycle payments. Processing a leaver's final pay, a settlement agreement or a one-off bonus run outside the normal cycle. Ask whether these incur a per-run fee.
• Auto-enrolment administration. Assessing eligibility, issuing communications, managing opt-ins and opt-outs, submitting pension contributions. This is a compliance duty with its own workload, and some providers charge £1–£2 per employee on top of the base fee.
• Pension interface charges. Submitting contribution files to your pension provider(s). Some include this; others charge per submission.
• Query charges. Does the base fee include a reasonable volume of employee and manager queries, or are queries charged individually?
• Contract exit fees. What does it cost to leave? Will the provider supply your data in a usable format, and is there a charge for that?
• Price escalation clauses. Many contracts include an annual uplift linked to RPI, CPI or a fixed percentage. A 3% annual escalation on a three-year contract adds roughly 9% to your cost by year three.

Key takeaway: ask every provider for a full schedule of charges, not just the PEPM. The quote that looks cheapest on the headline rate can end up costing more once extras are factored in.

Important: these are illustrative figures, not a guarantee. Your actual costs depend on your specific situation: pay complexity, number of pay groups, integration needs and the provider you choose. The in-house estimate assumes a two-person team; a more complex payroll may need a larger team, which widens the gap further. The outsourced estimate would be higher with weekly payroll cycles or multiple entities.

If you're weighing up whether outsourcing is the right move for your organisation, rather than just the cost, our guide to comparing in-house payroll with outsourcing covers the full decision.

The ROI beyond the price tag

Cost matters, but it isn't the only thing that changes when you outsource. For most employers, the compliance and operational arguments are at least as strong as the financial case.

Compliance risk drops significantly. Under RTI, you must submit payroll data to HMRC on or before each payday. Late filing triggers penalties that scale with your headcount:

 

Number of employees	Monthly penalty per default
1–9	£100
10–49	£200
50–249	£300
250+	£400

 

Source: GOV.UK, HMRC Compliance Handbook. The first late submission in a tax year is not penalised. Penalties are issued quarterly. If the failure continues beyond three months, an additional penalty of 5% of the tax and National Insurance that should have been reported may apply.

For a 400-person employer, a single late filing costs £300. Miss three months and you're facing £900 in fixed penalties, plus the potential 5% surcharge. The National Living Wage rose to £12.71 per hour from April 2026, and auto-enrolment thresholds remain at a £10,000 earnings trigger for the 2026/27 tax year. Getting either of these wrong creates further exposure. The Employment Rights Act 2025, now in force and being phased through 2026–27, adds another layer of complexity, including a new Fair Work Agency with enhanced enforcement powers from April 2026.

A specialist provider helps reduce this risk through dedicated expertise, up-to-date systems and ongoing legislative monitoring. Accuracy still depends on the quality of the information and inputs you provide, but the compliance burden shifts significantly. We track every UK legislative change as part of our standard service, and our representatives sit on HMRC consultation panels including the Rep Body Group and the Employer Payroll Group, so we're often aware of changes before they take effect.

Time comes back. The hours your payroll team currently spends on processing, queries and compliance monitoring can be redirected toward work that adds more strategic value: workforce planning, people analytics, or simply running a leaner operation.

Accuracy improves. Manual or semi-manual payroll processes are inherently error-prone. A well-run outsourced service with built-in validation and exception handling will typically deliver higher accuracy: fewer corrections, fewer employee complaints, fewer HMRC queries.

For a structured approach to quantifying these benefits internally, our guide to building a business case for outsourcing walks through the numbers step by step.

Frequently asked questions

How much does it cost to outsource payroll in the UK?

Most providers charge per employee per month (PEPM), with rates typically ranging from £4 to £15 depending on service level, headcount and complexity. A fully managed service usually falls in the £5–£12 PEPM range. There's normally a separate one-off implementation fee on top, which can be the largest single cost in year one.

 

What is a typical PEPM fee for managed payroll?

For a fully managed service, where the provider handles processing, HMRC submissions, auto-enrolment and year-end, most employers can expect to pay roughly £5–£12 per employee per month. The rate depends on your headcount, pay frequency, number of pay groups and the level of complexity in your payroll. Higher headcount generally brings a lower per-head rate.

 

Is outsourcing payroll cheaper than doing it in-house?

In most cases, yes, particularly for employers with 20–30 or more employees. In-house payroll carries costs beyond the team's salary: software, training, absence cover, recruitment, error correction and compliance risk. When you compare the total cost of ownership rather than just the obvious costs, outsourcing typically comes out lower. That said, organisations with very large or highly specialised payrolls may find that a dedicated in-house team gives them better value and control.

 

What hidden costs should I ask about when comparing payroll providers?

Ask for a full schedule of charges, not just the PEPM. The most commonly missed costs include the implementation fee, year-end processing (P60s, P11Ds), ad-hoc or out-of-cycle payment runs, auto-enrolment administration, pension submission charges, employee query fees, contract exit fees and annual price escalation clauses. A low headline rate with expensive extras can end up costing more than a higher all-inclusive rate.

 

How much does payroll implementation cost?

Implementation fees vary widely based on complexity. They cover data migration, system configuration, parallel running, testing and training. For a straightforward payroll, expect the equivalent of two to four months of service charges as a one-off cost. More complex migrations involving multiple entities, historical data and bespoke integrations will be higher. Some providers amortise the fee across the first year of the contract.

 

Do payroll outsourcing costs vary by company size?

Yes, significantly. Larger employers typically get a lower PEPM rate because the provider benefits from economies of scale. However, larger payrolls are also more likely to involve complexity (multiple pay frequencies, entities, integrations and reporting requirements) which pushes the rate back up. The net effect is that most employers benefit from the total cost saving compared with running a full in-house operation.

 

What's included in a managed payroll service fee?

A fully managed service typically includes payroll processing (gross-to-net calculations), payslip production, HMRC RTI submissions, auto-enrolment assessment and administration, statutory payment calculations (SSP, SMP, ShPP, SPP), year-end processing, standard reporting and a degree of employee query handling. What varies between providers is whether items like pension submissions, P11D filing, out-of-cycle runs and bespoke reporting are included in the base fee or charged separately. Always ask for the full breakdown.