HR software FAQs for UK employers
Reviewed by Mellow Editorial Team, HR & payroll content team
HR software is a broad category covering anything from basic payroll tools to full people-management platforms that handle recruitment, onboarding, absence tracking, performance reviews and more. What counts as the right solution depends entirely on the size of your team and the complexity of your HR needs.
What does HR software actually do?
At its core, HR software automates the administrative work that would otherwise sit in spreadsheets or someone's inbox. Common functions include:
- Payroll processing — calculating pay, tax and National Insurance deductions, and filing Real Time Information (RTI) submissions to HMRC via Full Payment Submission (FPS) on or before each payday
- Leave management — tracking statutory annual leave (5.6 weeks, or 28 days including bank holidays for a five-day week) and any additional contractual entitlement
- Document storage — contracts, right-to-work checks, policies
- Absence and sickness tracking — including Statutory Sick Pay eligibility
- Reporting and compliance — P60s (due by 31 May), P11Ds (due by 6 July), gender pay gap data
More advanced platforms add modules for applicant tracking, learning management and employee self-service portals.
Is HR software a legal requirement for UK employers?
No, but meeting your legal obligations without some form of system becomes increasingly difficult as headcount grows. HMRC requires RTI payroll reporting on or before every payday, P60s issued to every employee by 31 May each year, and P11Ds filed by 6 July for benefits in kind. Missing these deadlines triggers penalties. Auto-enrolment pension duties — employer minimum 3%, employee minimum 5% of qualifying earnings — also require accurate payroll data to administer correctly.
The Employment Rights Act 2025 has extended day-one rights for employees, which means your HR processes and record-keeping need to be sharper from the moment someone starts. A system that captures onboarding data, contracts and policy acknowledgements from day one reduces your exposure.
What should UK employers look for when choosing HR software?
HMRC integration. If the software includes payroll, confirm it is RTI-compliant and can handle PAYE, employee National Insurance at 8% (2% above the upper earnings limit), and employer National Insurance at 13.8%. Check whether the vendor updates the software automatically when tax tables change at the start of each tax year.
Auto-enrolment support. The software should calculate pension contributions against qualifying earnings, communicate with your pension provider, and maintain the records your re-enrolment duties require every three years.
Scalability. A ten-person business and a two-hundred-person business have very different needs. Some platforms charge per employee per month, which keeps costs proportionate early on but can become expensive quickly. Understand the pricing model before you commit.
Data security and GDPR compliance. HR data is sensitive personal data under UK GDPR. Ask vendors where data is stored, whether it stays within the UK or EEA, and how access controls work.
Support. If payroll runs on a Friday and something breaks, you need a real person to call. Check the support hours and whether UK-based support is included in your plan or costs extra.
What is the difference between standalone payroll software and a full HR platform?
Standalone payroll software handles pay calculations, RTI submissions and statutory reporting. It is typically cheaper and simpler. A full HR platform layers people-management tools on top — absence tracking, performance reviews, org charts, onboarding workflows — and often integrates with your accounting software as well.
For a business with fewer than around twenty employees, standalone payroll software plus a simple document management setup often covers everything. Beyond that, the administration burden of managing leave requests, probation reviews and compliance paperwork by hand starts to outweigh the cost of a more complete system.
Some employers separate the two deliberately: specialist payroll software for PAYE accuracy, and a separate HR platform for everything else. This works well when your payroll is complex (multiple pay frequencies, contractors, benefits) but your HR processes are straightforward.
Do HR software platforms handle contractors and global workers?
Most UK-focused HR platforms are built around employed workers. If you engage contractors — particularly those caught by IR35 — your software needs to handle off-payroll working rules correctly, or you need a separate process for it.
For employers with workers in multiple countries, a standard UK HR platform will not cover foreign payroll, tax withholding or local employment law. How Mellow runs payroll across six countries on one platform explains how multi-country setups work in practice. The key point is that payroll compliance is jurisdiction-specific, and software that works in the UK does not automatically transfer abroad.
How much does HR software cost in the UK?
Pricing varies widely. Many platforms charge a monthly fee per employee, sometimes with a minimum monthly spend regardless of headcount. Others charge a flat monthly fee up to a certain employee count. Implementation fees, training costs and charges for additional modules are common extras that are not always obvious from headline pricing.
The honest answer is to request a full breakdown of what is and is not included, then model the cost at your current headcount and at the headcount you expect to reach in two years. The cheapest option at ten employees is rarely the cheapest at fifty.
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