Payroll Outsourcing Costs: UK Pricing Guide

Most UK payroll outsourcing providers charge per employee per month (PEPM), with a separate one-off implementation fee. For a fully managed service (where the provider handles processing, HMRC submissions, auto-enrolment and year-end) you can expect to pay roughly £5–£12 per employee per month, though that figure moves with headcount, pay frequency and complexity. This guide breaks down how pricing works, what drives the cost, and how to compare quotes so you're measuring like for like. If you're weighing up whether to outsource at all, our complete guide to managed payroll covers the broader decision.

At a glance

Most UK providers charge per employee per month (PEPM), with a separate one-off implementation fee. The two figures together make up your year-one cost. How pricing works
Fully managed, bureau and software-only services sit at very different price points. Comparing quotes across different service levels is like comparing a lease with a purchase. How pricing works
A fully managed mid-market service typically costs £5–£12 PEPM, though complexity, pay frequency and integrations all move the number. What drives the cost
Implementation is often the largest single cost in year one. Ask what it covers before you compare headline rates. Hidden costs
In-house payroll carries costs most businesses undercount. Salary, software, training, error correction and compliance risk add up quickly. Cost comparison
The cheapest headline rate is rarely the cheapest option. Compare total cost of ownership, not just the monthly fee. How to compare quotes
Beyond cost, outsourcing shifts compliance risk. Late RTI filing alone can trigger HMRC penalties of £100–£400 every month. ROI beyond the price tag

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:

Pricing model	How it works	Typically used by	Watch out for
Per employee per month (PEPM)	Fixed fee per employee on your payroll each month	Most managed and bureau providers	Does the rate include leavers and joiners processed mid-month?
Per payslip	Fee per payslip generated. One employee paid weekly = four payslips.	Some bureau providers	Costs multiply quickly for weekly or fortnightly payroll cycles
Flat monthly fee	Fixed monthly charge regardless of headcount (usually up to a cap)	Small employers, often up to 5–10 employees	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+)	Mid-market and enterprise providers	Check whether the rate applies to the whole headcount or only employees within each band
Hybrid	Base monthly fee plus a per-employee variable	Some mid-market providers	The base fee can make it expensive at low headcount

PEPM is the dominant model for mid-market 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.

What drives the cost

Your PEPM rate isn't fixed by some industry standard. It's a reflection of how much work your payroll creates. A 400-person employer running clean monthly payroll with a single pay group will pay less per head than a 400-person employer running weekly and monthly cycles across three entities with shift-based overtime and multiple pension schemes.

Here are the variables that move your quote:

Cost driver	How it affects price	What to ask
Headcount	Higher headcount generally means a lower PEPM rate, because providers benefit from scale	At what headcount bands does the rate step down?
Pay frequency	Weekly payroll means four times the processing volume of monthly. Expect a higher PEPM or per-payslip cost.	Is the quote based on monthly processing? What's the uplift for weekly or mixed cycles?
Payroll complexity	Multiple pay rates, shift patterns, overtime rules, commission, salary sacrifice and benefits-in-kind all add processing time	Which complexity factors are included in the base rate and which are charged as extras?
Pay groups and legal entities	Each separate PAYE scheme or legal entity typically adds cost	Is there a per-entity fee or is it bundled into the PEPM?
Integrations	Connecting payroll to your HR system, time-and-attendance platform, pension provider or accounting software may require setup and ongoing maintenance	Are integrations included or quoted separately? Who builds and maintains them?
Multi-site or multi-country	Different sites with different pay rules, or employees in multiple jurisdictions, add compliance complexity	Does the quote cover all sites and jurisdictions, or just UK payroll?
Reporting	Standard reports are usually included; bespoke reporting or management information packs may not be	How many standard reports are included? What's the cost of a custom report?
Level of service	A named, dedicated payroll manager costs more than a shared service desk	Will you have a dedicated contact, or a team/helpdesk model?

In practice: a 400-person retailer running weekly payroll for hourly-paid staff and monthly payroll for salaried employees, with overtime, commission and two pension schemes, will sit at the upper end of the PEPM range. The same headcount on clean monthly payroll with a single pension scheme will sit nearer the lower end.

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 mid-market 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?

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.

Outsourced vs in-house: a real cost comparison

If you're considering outsourcing for the first time, the natural question is: would it actually cost less than what we're doing now? The honest answer is that it depends, but most mid-market employers underestimate what in-house payroll really costs them.

What in-house payroll actually costs

The salary line is only the start. A UK payroll manager earns in the region of £38,000–£50,000 depending on experience and location (Glassdoor, Indeed and PayScale 2026 data), with a median around £42,000–£45,000. On top of that:

Employer National Insurance and pension contributions add roughly 15–20% to the salary cost
Payroll software licence: £200–£1,200 per year for a cloud-based platform, potentially more for an enterprise system
Training and CPD: payroll legislation changes every April at a minimum, and the Employment Rights Act 2025 is introducing further changes through 2026 and 2027. Budget £300–£800 per year for courses and CIPP membership.
Absence and leave cover. Payroll can't be paused when your payroll manager is on holiday or off sick. Cover arrangements, whether through a temp, overtime or a second team member, carry a cost.
Recruitment. If your payroll person leaves, recruitment fees typically run to 15–20% of salary, plus the productivity gap while the role is vacant.
Error correction and compliance risk. Time spent identifying and fixing payroll errors, recalculating statutory payments, and dealing with HMRC queries has a real cost, even if it doesn't appear on a budget line.

Worked example: a 400-person employer

The table below compares estimated annual costs for a mid-market employer with 400 employees on monthly payroll. The outsourced figures use a PEPM of £8 (mid-range for a fully managed service at this headcount) with a one-off implementation fee amortised over three years.

Cost element	In-house (annual)	Outsourced (annual)
Payroll team salary (1 manager + 1 administrator)	£70,000	N/A
Employer NI and pension (~18%)	£12,600	N/A
Payroll software licence	£1,000	N/A
Training and CPD	£600	N/A
Absence cover (estimated)	£2,000	N/A
Recruitment provision (amortised)	£2,500	N/A
PEPM (£8 × 400 × 12)	N/A	£38,400
Implementation fee (amortised over 3 years)	N/A	£3,000
Year-end and extras (estimated)	N/A	£1,500
Error correction and compliance risk (estimated)	£3,000	Included
Estimated annual total	~£91,700	~£42,900

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.

The point isn't that outsourcing is always cheaper. It's that the comparison needs to include the full cost of both models, not just the payroll team's salary against the provider's invoice.

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.

How to compare quotes fairly

Once you've decided to explore outsourcing, you'll likely request quotes from several providers. The challenge is that no two quotes are structured the same way: different service levels, different pricing models, different inclusions. Here's how to compare them on a level footing.

A like-for-like checklist

For each quote you receive, confirm:

Service level. Is this fully managed, bureau or something in between? What does the provider do, and what does your team still do?
What's included in the PEPM. Payslip production, RTI submissions, auto-enrolment, year-end, employee queries, reporting?
What's charged as an extra. Implementation, out-of-cycle runs, P11Ds, pension submissions, additional pay groups, custom reports?
The implementation fee. Fixed or variable? What's included? What happens if it overruns?
Contract terms. Length, notice period, break clause, exit fee, data portability on termination?
Price escalation. Fixed for the term, or subject to annual uplift? Linked to what index?
SLA and accuracy guarantee. What's the committed accuracy rate? What happens when errors occur?
Dedicated or shared service. Named payroll manager, or shared team? What are the response times?

Convert every quote to an estimated total annual cost including extras and implementation (amortised). The PEPM alone doesn't tell you enough.

Red flags and negotiation levers

Watch for:

A very low PEPM paired with a long list of separately charged extras. The headline is designed to win the shortlist, not reflect the true cost.
Lock-in contracts of three or more years with no break clause and punitive exit fees.
No named implementation contact. Implementation is where things go right or wrong.
Vague SLAs with no defined accuracy commitment or remediation process.
Resistance to providing a full schedule of charges before you sign.

You can often negotiate on:

Multi-year commitment in exchange for a lower PEPM or waived implementation fee
Bundling payroll with HR services for a combined rate
Annual payment rather than monthly for a discount
Consolidating pay groups or entities to reduce per-entity charges

If you want a structured approach to the procurement process, our payroll RFP template gives you a ready-made framework. For broader guidance on evaluating payroll providers, we cover the criteria beyond cost.

The ROI beyond the price tag

Cost matters, but it isn't the only thing that changes when you outsource. For most mid-market 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 absorbs this risk. Their team tracks every legislative change, applies it to your payroll on time, and carries the expertise to handle edge cases, from salary sacrifice interactions with NMW to complex auto-enrolment assessments for workers with irregular hours.

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.

Why SD Worx

We've been running payroll for 80 years, long enough to know that the right outsourcing partner isn't always the cheapest one. What we offer is depth: a UK team of CIPP-certified payroll professionals processing over 6 million payslips every month for more than 90,000 customers worldwide, with a 99.97% accuracy rate.

Our managed payroll services are backed by ISO 27001, ISAE 3000 and ISAE 3402 Type II certifications, independently audited standards that demonstrate how seriously we take data security and process integrity. Our representatives sit on UK Government consultation panels including the Rep Body Group and the Employer Payroll Group, and we're active in BCS (PSG), IReeN and the CIPP. When payroll legislation changes, we're often involved in the consultation process before it reaches your payroll.

We work with organisations of every size, from growing businesses to large enterprises. ISS, with over 38,000 employees across multiple payrolls, consolidated their operation with us into a single, stable, repeatable process: the kind of complexity where getting it right matters enormously. You can read their story here.

If you're looking for payroll services for smaller teams, we do that too.

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 for a mid-market employer 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, mid-market 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 mid-market 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 mid-market employers often pay a moderate PEPM but benefit most 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.

Ready to see what outsourcing would cost for your organisation? Our payroll outsourcing cost calculator gives you a personalised estimate based on your headcount and requirements. Or if you'd prefer to talk it through, get in touch with our team and we'll give you an honest view of whether outsourcing is the right move, and what it would look like.

Payroll Outsourcing Costs: UK Pricing Guide