Best payroll software for UK businesses
Reviewed by Mellow Editorial Team, HR & payroll content team
Choosing the right payroll software depends on your business size, how complex your workforce is, and whether you need to pay people in more than one country. There is no single best option — but there are clear differences worth understanding before you commit.
What to look for before you compare
Every UK payroll tool must handle the legal basics: RTI submissions to HMRC via Full Payment Submission on or before each payday, auto-enrolment pension contributions (employer minimum 3%, employee minimum 5% of qualifying earnings), and year-end reporting — P60s by 31 May and P11Ds by 6 July.
Beyond compliance, the questions that separate good fits from poor ones include:
- Do you pay employees only, or contractors too?
- Is your workforce entirely UK-based, or spread across multiple countries?
- Do you want HR features bundled in, or just clean payroll?
- How much do you want to manage yourself versus hand off to a provider?
Get clear on those before reading any feature list.
The main categories of UK payroll software
Basic desktop or cloud payroll tools — software like Sage Payroll, BrightPay, and Moneysoft sits in this category. These are well-established, HMRC-recognised tools suited to small and medium businesses with a settled UK-only workforce. They handle RTI, statutory pay (sick, maternity, paternity), and pension submissions reliably. The trade-off is that setup and ongoing management largely falls to you or your bookkeeper.
Integrated HR and payroll platforms — Iris, MHR, and similar providers combine payroll with HR records, absence tracking, and reporting in one system. Useful if you want a single source of truth for employee data. Costs and implementation time tend to be higher, so this tier suits businesses with a dedicated HR function rather than a founder doing everything themselves.
All-in-one workforce platforms with global capability — tools like Deel, Remote, and Mellow fall here. They are built for businesses employing or engaging workers across more than one country. Alongside UK payroll, they typically handle employer of record (EOR) services, contractor management, and compliance in multiple jurisdictions. If your team is entirely UK-based and you have no plans to hire internationally, this category is likely more than you need. If you do have cross-border complexity, running separate tools per country quickly becomes unmanageable.
Where Mellow fits honestly
Mellow is most useful for businesses that mix UK-based workers with international contractors or employees — for example, a UK-founded company with engineers in Poland, designers in Portugal, and a sales lead in the US. Mellow runs payroll across multiple countries from a single platform, which reduces the overhead of managing separate local providers.
For a business with five UK employees and nothing else, Mellow is not the most cost-efficient starting point. A straightforward tool like BrightPay or Sage would be simpler and cheaper. Choosing software that matches your actual complexity — not your hypothetical future complexity — is almost always the right call.
Practical questions to ask any provider
Before signing up, it is worth pressing on a few specifics:
RTI and HMRC integration. Is the FPS submission automated, or do you have to trigger it manually? Late or incorrect submissions can result in penalties.
Pension provider compatibility. Does the software integrate directly with your chosen pension provider, or does it produce a file you upload yourself? The latter is not a dealbreaker, but it adds a step.
How statutory payments are handled. Statutory Sick Pay, Statutory Maternity Pay, and other family-leave payments have specific calculation rules. Check whether the software handles these automatically or requires manual input.
Day-one employment rights. The Employment Rights Act 2025 has strengthened protections that apply from the first day of employment. Your payroll and HR processes need to reflect that — ask how the software supports compliance with updated rights around unfair dismissal eligibility, flexible working requests, and similar provisions.
Support when something goes wrong. Payroll errors are stressful and time-sensitive. Find out whether support is email-only or available by phone, and what the typical response time is.
Cost considerations
Most payroll software is priced per employee per month, often with a platform fee on top. Costs vary considerably by tier — basic tools tend to be the most affordable, integrated HR platforms the most expensive. Always check what is included at the base price versus what sits behind add-on fees, particularly for things like multiple pay frequencies, contractor payments, or additional legal entities.
Free HMRC-recognised software does exist for very small employers, and HMRC maintains a current list on its website. It is a reasonable starting point if you are running payroll for fewer than 10 people and your situation is straightforward.
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