Best HR software for UK businesses
Reviewed by Mellow Editorial Team, HR & payroll content team
Choosing the best HR software for your UK business depends on your size, how complex your payroll is, and whether you employ people in more than one country. There is no single best option — but there are clear differences that make certain platforms better suited to specific situations.
What to look for in UK HR software
Before comparing any tools, pin down what you actually need. UK compliance is non-negotiable, so at minimum the platform must handle:
- RTI submissions to HMRC via Full Payment Submission (FPS) on or before each payday
- Auto-enrolment pension contributions (employer minimum 3%, employee 5% of qualifying earnings)
- Accurate PAYE calculations across the personal allowance (£12,570), basic rate (20%), higher rate (40%) and additional rate (45%) bands
- National Insurance at 13.8% employer and 8% employee (category A)
- Statutory leave entitlements — 5.6 weeks for full-time employees — and statutory sick and family-leave pay
- P60 production by 31 May and P11D filing by 6 July
Beyond compliance, consider whether you need time tracking, recruitment, performance management, or just payroll and people records. Buying a platform packed with features you will never use adds cost and complexity.
The main categories of HR software
All-in-one HRIS platforms — Tools such as BambooHR, HiBob and Personio are built around storing employee records, managing leave, running appraisals and handling onboarding. They suit businesses of roughly 50–500 people that want a single system of record. Payroll is sometimes built in, sometimes handled through integrations with dedicated payroll providers.
UK payroll-first platforms — Sage Payroll, Moorepay and Bright (formerly Thesaurus) are built around the mechanics of running a UK payroll compliantly. They are reliable for PAYE and RTI but tend to be thinner on broader HR features. Small and mid-sized businesses that want payroll done precisely, without much else, often find these a good fit.
Global employment and payroll platforms — If you employ people in more than one country, or hire contractors and employees in different jurisdictions, a different category of tool becomes relevant. Platforms like Deel, Remote, Rippling and Mellow are built to handle multi-country payroll, employer-of-record services, and contractor payments from one place. This matters more as UK businesses hire internationally or as overseas companies build UK teams.
Standalone payroll bureaux and managed services — Some businesses prefer to outsource payroll entirely to an accountant or managed service rather than run software themselves. This is still common among smaller employers and removes the burden of staying current with HMRC changes.
Where platforms tend to differ
Pricing models vary significantly. Some platforms charge per employee per month; others charge a flat fee up to a headcount ceiling; global platforms often charge differently for employees versus contractors. Get a clear total cost for your actual headcount before committing.
UK-specific depth is worth scrutinising on global platforms. A tool built primarily for the US market may handle UK payroll adequately but lack the nuance needed for, say, salary sacrifice pension arrangements or complex statutory pay calculations. Ask specifically how the platform handles RTI and auto-enrolment rather than accepting a general "we support the UK" answer.
Employment law updates matter more than ever. The Employment Rights Act 2025 strengthens day-one rights for employees, which affects how contracts, probation periods and dismissal processes should be managed. Your HR platform should reflect these changes — check when the vendor last updated their UK compliance templates and policies.
Integration with accounting software is often underestimated. If you use Xero or QuickBooks, verify that payroll journals post cleanly rather than requiring manual re-entry.
How Mellow fits in
Mellow is built for businesses that employ or contract people across multiple countries — including the UK. It handles payroll, employer-of-record arrangements and contractor payments in one place, which is useful if your workforce is internationally distributed.
For a UK-only business with a straightforward domestic workforce, a dedicated UK payroll platform or HRIS may cover your needs at lower cost. Where Mellow earns its place is when a business is managing UK employees alongside workers in other countries and wants to run payroll across multiple jurisdictions from one platform without stitching together several different tools.
Making the decision
Run a shortlist of two or three platforms against your actual requirements: headcount now and in 12 months, countries of employment, features you will genuinely use, and total cost including implementation. Request a demo that steps through a UK payroll run — not just a slide deck — and ask how the vendor handles HMRC correspondence and year-end filings. That practical test will tell you more than any feature comparison table.
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