Last updated: 21 October 2026 | By Chris Barnard, Managing Director, Acenteus Accounting
This article is general guidance for UK employers and accountancy practices and is not tax or legal advice. Rates and thresholds are for the 2026/27 tax year and penalty amounts are as published by HMRC, so check GOV.UK for the current position before you decide.
The main pros of outsourcing payroll in the UK are lower compliance risk, less time spent on each pay run, specialist knowledge of changing rules and cover when your payroll person is away. The main cons are less direct control, dependence on the provider’s cut-off times, sharing employee data with a third party and, for very small teams, a cost that can exceed doing it yourself. For most employers with more than a handful of staff, outsourcing is cheaper once staff time, software and the cost of errors are counted. Each con can be reduced with the right contract.
Most of the pages ranking for this question are written by payroll software companies and bureaus, so each one argues for its own product. This guide is deliberately balanced. It sets out the real advantages and disadvantages, gives a practical fix for each disadvantage, and shows where the break-even point sits using 2026/27 figures: the National Living Wage of £12.71 an hour, employer National Insurance at 15% above £5,000 and an Employment Allowance of £10,500.
Key takeaways
- The biggest pro is risk, not cost: payroll errors affect people’s pay, HMRC filings and pensions, and they are expensive to unwind.
- The biggest con is control: you work to someone else’s timetable and process, so cut-off times and change requests need agreeing upfront.
- Small teams can go either way: with a couple of employees and simple pay, in-house payroll with good software is often cheaper.
- The 2026/27 rules raise the stakes: a higher minimum wage, employer National Insurance at 15% above £5,000, auto-enrolment and RTI deadlines all leave less room for error.
- Every con has a fix: a service level agreement, a named contact, clear cut-off times and UK GDPR terms deal with most of the risks.
What does outsourcing payroll actually involve?
Outsourcing payroll means a provider runs your pay calculations, payslips, Real Time Information (RTI) submissions to HMRC, pension contributions and statutory payments, using information you send each pay period. You still decide who is paid what, approve the payroll before it is paid and usually make the payments from your own bank account. The provider handles the calculations, the filings and the compliance detail.
There are levels. A basic service processes the payroll from your inputs. A managed service also handles starters and leavers, pension auto-enrolment, P11Ds and HMRC queries. A fully managed service can include employee queries and, in some cases, making the payments for you.
What are the pros of outsourcing payroll?
- Fewer errors and less compliance risk
Payroll is full of rules that change every April: tax codes, National Insurance thresholds, the National Living Wage, statutory sick, maternity and paternity pay, student loan plans and pension contributions. A specialist provider updates its process for each change. A business that runs payroll a few times a year, or relies on one person, is more likely to miss one.
The cost of errors is real. Late RTI submissions can attract monthly penalties of £100 for employers with one to nine employees, rising to £400 for those with 250 or more, according to HMRC’s guidance on what happens if you do not report payroll information on time. Underpaying the minimum wage, even by accident, can mean arrears, penalties and being named publicly.
- Time back for the business
Every pay run takes time: collecting hours and changes, processing, checking, filing, answering questions. For a business owner or office manager, that is time away from customers. Outsourcing usually reduces internal effort to sending changes and approving a draft.
- Specialist knowledge on tap
A good provider deals with the awkward cases every week: salary sacrifice, holiday pay for irregular hours workers, attachment of earnings orders, director National Insurance, termination payments. You get access to that knowledge without employing it.
- Cover and continuity
If your payroll depends on one person, their holiday, illness or resignation is a payroll risk. A provider has more than one person who knows your payroll.
- Confidentiality inside the business
When payroll is run in-house, someone in the business sees everyone’s pay. Outsourcing keeps salary details with fewer internal people, which many owners prefer.
- Predictable cost
Most providers charge a fixed monthly fee or a price per employee, which is easier to budget than staff time and software. Our guide to payroll outsourcing costs in the UK sets out typical pricing by headcount and service level.
What are the cons of outsourcing payroll, and how do you fix each one?
Every one of these is real, and every one can be reduced. The fix column is where most decisions are actually won or lost.
| Con | Why it matters | How to fix it |
|---|---|---|
| Less direct control | You cannot change a payslip yourself at 4pm on payday | Agree a change process and an emergency route for urgent corrections |
| Cut-off times | Changes must reach the provider days before payday | Agree cut-offs in writing and set internal deadlines a day earlier |
| Data sharing | Employee personal data, including bank details, goes to a third party | A UK GDPR compliant processor contract, secure portals instead of email, named people with access |
| Dependence on the provider | If they make a mistake, your employees feel it | A service level agreement with accuracy and turnaround targets, and a named contact |
| Cost for very small teams | For one or two employees on fixed pay, a provider can cost more than software | Compare against HMRC's free tool or low cost software, and your own time |
| Less internal knowledge | Nobody in the business understands payroll any more | Ask for a monthly payroll summary and keep a short internal procedures note |
| Switching effort | Moving provider mid-year needs care with year-to-date figures | Switch at a tax year start where possible, and reconcile year-to-date figures on the first run |
The data point deserves a little more. Payroll data is some of the most sensitive personal data a business holds. Ask any provider where the data is processed, who can see it, how it is sent and what happens at the end of the contract. If the provider uses staff outside the UK, the contract also needs an international transfer safeguard. Our checklist of security and GDPR red flags in an outsourced provider covers the questions to ask.
In-house payroll vs outsourcing: where is the break-even point?
The honest answer is that it depends on headcount, pay frequency and complexity. The table below shows how the balance usually shifts. The in-house time estimates are illustrative assumptions, so replace them with your own.
| Team size | In-house: typical effort and cost | Outsourced: published price ranges | Usually better value |
|---|---|---|---|
| 1 to 2 employees, fixed pay | About 1 hour a month. HMRC's free Basic PAYE Tools can be used for fewer than 10 employees | Fixed fees from about £25 to £40 a month | In-house, if someone is confident with payroll |
| 3 to 10 employees | 2 to 4 hours a month plus software, more with starters, leavers and variable hours | About £20 to £120 a month depending on service level | Close. Outsourcing wins if pay varies or nobody owns payroll |
| 11 to 50 employees | 4 to 15 hours a month, pension and statutory pay admin, P11Ds | Roughly £6 to £20 per employee per month for managed services | Outsourcing in most cases |
| 50 or more employees | A dedicated payroll role or a large part of one | Per employee pricing or a dedicated outsourced resource | Outsourcing, or a dedicated in-house specialist for complex payrolls |
The outsourced ranges come from our payroll outsourcing costs guide, which goes into setup fees, pension administration and year-end extras. HMRC’s Basic PAYE Tools is free for employers with fewer than 10 employees, though it is basic and not designed for agents.
Put a value on your own time when you compare. An hour of a director’s time is rarely worth less than the provider’s monthly fee for a small team.
What do the 2026/27 rules mean for the decision?
The rules for the 2026/27 tax year make payroll more expensive and leave less room for error.
| Rule (2026/27) | What it means for payroll |
|---|---|
| National Living Wage of £12.71 an hour for workers aged 21 and over from 1 April 2026 | Pay rates, salary sacrifice and unpaid overtime all need checking against the minimum |
| Employer National Insurance at 15% on earnings above £5,000 a year | Higher employer costs and more value in getting categories and allowances right |
| Employment Allowance of £10,500 | Eligible employers must claim it correctly through payroll |
| Auto-enrolment pension duties | Assessing, enrolling and re-enrolling staff and paying contributions on time |
| RTI reporting on or before each payday | Late or missing submissions can lead to monthly penalties |
The current minimum wage rates are on GOV.UK’s National Minimum Wage and National Living Wage rates page, and HMRC’s rates and thresholds for employers 2026 to 2027 sets out the National Insurance figures. We cover the detail in our guides to UK minimum wage changes from April 2026, the Employment Allowance for 2026/27 and payroll compliance in 2026.
Who should keep payroll in-house?
In-house payroll can be the right choice when:
- The team is very small and pay is fixed, and someone enjoys and understands payroll.
- Payroll is highly bespoke, such as complex shift premiums that change daily and need someone on site to interpret.
- You already employ a payroll specialist with capacity, good software and cover arrangements.
If you keep it in-house, protect yourself: document the process, make sure two people can run it, use recognised payroll software and keep up with April changes. Our comparison of the best payroll software for small businesses can help with the software choice.
Who should outsource payroll?
Outsourcing usually makes sense when:
- You have more than a handful of employees, especially with starters, leavers or variable hours.
- Payroll depends on one person and there is no cover.
- The owner or a senior manager is running payroll instead of running the business.
- You have had errors, late filings or minimum wage worries in the past.
- You are growing quickly and do not want to hire a payroll specialist yet.
What about accountancy practices offering payroll to clients?
The same pros and cons apply one level up. A practice running a payroll bureau carries the compliance risk for every client payroll, and peak weeks such as the April year start and the run up to P11D deadlines can overwhelm a small team. Many practices keep the client relationship and outsource the processing to a dedicated team that works in the practice’s own payroll software, so clients see no change.
For practices choosing software to run that bureau, our guide to the top payroll bureau software in the UK compares the main options.
How do you outsource payroll without problems?
- List what is in scope. Pay frequencies, number of employees, pensions, statutory payments, P11Ds, CIS if relevant, and who makes the payments.
- Agree cut-off times and turnaround. In writing, with a named contact and a backup.
- Sign a proper contract. Including a service level agreement, data protection terms, liability and exit arrangements.
- Plan the switch. Ideally at the start of a tax year. If mid-year, reconcile year-to-date pay, tax and National Insurance on the first run.
- Run a parallel payroll for the first period. Compare the provider’s draft with your own before you approve it.
- Review monthly. Check the payroll summary and journal each month, even when you trust the provider.
How Acenteus Accounting helps
We run payroll for UK businesses and, behind the scenes, for UK accountancy practices. For businesses, our bookkeeping and payroll services cover pay runs, RTI, auto-enrolment, statutory payments and P11Ds, with a named contact and agreed cut-off times. For practices, our accountants process client payrolls in your own payroll software, so you keep the relationship and the review.
One large practice in the South West of England has about eight Acenteus team members running its entire payroll function, including HMRC and client contact. A practice in Scotland started with payroll and now hands us all of its compliance work. “We urgently needed a payroll staff member with UK experience, and Acenteus was our go-to partner. They promptly onboarded a skilled professional,” says the Senior Accountant at FinEdge Consulting.
Acenteus is a UK company based in Brighton, with experienced accountants in dedicated delivery centres in India under UK oversight, working to UK GDPR standards in a paperless, access-controlled environment. If you are weighing up the decision, send us your headcount and pay frequency and we will give you a straight answer on whether outsourcing makes sense for you. Practices can also read how our Full-Time and Hourly Models work on our accounting outsourcing for UK accountants page.
Frequently Asked Questions (FAQ)
Less direct control, reliance on the provider's cut-off times, sharing employee data with a third party and, for very small teams, a cost that can exceed doing it yourself. Reduce these with a service level agreement, a named contact, agreed cut-offs and UK GDPR terms.
Fewer errors and less compliance risk, time back for the business, specialist knowledge, cover when your payroll person is away, more confidentiality inside the business and a predictable monthly cost.
For most small employers, yes, once staff time, software and compliance risk are counted. The break-even point depends on headcount and pay frequency. With one or two employees on fixed pay, in-house payroll can be cheaper.
Published UK ranges start from about £25 to £60 a month for one to five employees on a fixed fee, and roughly £4 to £25 per employee per month depending on the level of service. Setup, pension administration and P11Ds can be extra.
Yes. You approve every payroll before it is paid, usually make the payments from your own bank account and set the changes each period. A clear change process and cut-off times keep you in control.
The start of a tax year, on 6 April, is the cleanest time because year-to-date figures start from zero. A mid-year switch is possible but needs careful reconciliation on the first run.
Yes. You provide accurate information on hours, changes, starters and leavers, approve each payroll and remain legally responsible as the employer for paying staff correctly and on time.
