Best HR Software for Small Businesses (UK 2026 Comparison)

The UK SMB HR software market has consolidated sharply over the last five years. Around six platforms genuinely compete for the under-100-headcount market in 2026, with the rest of the field either pivoting upmarket or quietly winding down. This guide compares the serious options through the lens of a small business owner: what does each one cost, what is it actually best at, where are the bundled perks worth claiming, and which one wins for which kind of business.

What HR software actually does at SMB scale

For a 5–100 person UK business, "HR software" means the core stack of leave management, absence tracking, document storage, contract management and a basic employee self-service portal. Some platforms layer on payroll integration, performance management, recruitment ATS and benefits administration. The right product depends on which of those layers you actually need today, not which sales-deck wishlist sounds appealing.

The 80/20 in HR software adoption is leave management and document storage. Most SMBs can wait until 50+ employees before they need integrated performance review or ATS — even though every vendor will sell those layers from day one.

The serious UK SMB HR software options

BreatheHR

Long-established UK player with a strong focus on the HR-admin-as-a-product layer — onboarding workflows, document checklists, performance reviews. No bundled perks portal in core tier; perks add as a separate upsell.

Where it wins: HR-admin-heavy businesses (charities, professional services, regulated sectors) that need the workflow layer. Where it loses: cost-conscious teams that just need leave plus documents.

Charlie HR

Modern, well-designed, popular with creative agencies and tech startups. Strong leave management, good performance-review module, integrates with Slack and most calendar tools. Pricing around £5–£8 per employee per month.

Where it wins: design-forward startups and agencies. Where it loses: heavy HR-compliance-driven sectors.

Personio

German-origin, heavyweight feature set, popular with scale-ups. Around 50–500 employee sweet spot. Pricing is higher than the SMB-tier players (typically £6–£12/employee/month equivalent) but the breadth is genuine.

Where it wins: scaling businesses (50+ employees) that want recruitment, onboarding, performance and analytics in one stack. Where it loses: under-30 teams paying for breadth they will not use.

Sage HR

Sage's SMB HR offering, well-integrated with Sage Payroll. Solid product, less innovative than the modern alternatives. Strong fit for businesses already on Sage Accounting.

Where it wins: existing Sage customers — the integration removes friction. Where it loses: businesses not on Sage; the product feels older than the modern alternatives.

LeaveApprove

Disclosure: this is our software. Focused specifically on leave management, with strong UX, multi-tenant team support, integrated public-holiday handling, and a built-in perks portal (LeaveApprove Perks). £8/user/month with a 14-day free trial. Sector discounts of 25–50% for charities, education, NHS, social enterprises and startups.

Where it wins: businesses for whom leave is the primary HR need and who want a perks portal bundled in at no extra cost. Where it loses: businesses that need full HR stack including performance, recruitment and document workflows.

Timetastic / WhosOff / Holiday Tracker

Pure leave-tracking apps, simpler scope than the full-HR options. Cheap (typically £2–£5/user/month) and easy to roll out. No perks layer. Worth considering if leave management is genuinely all you need and your headcount is under 15.

Pricing comparison at 25 employees

Pricing approximate at the time of writing. All vendors run sector discounts and seat-tier discounts that change pricing materially.

Where the perks bundle matters

Some HR suites, LeaveApprove Perks included, bundle a discount portal into the subscription. The financial logic for an SMB is straightforward: a separate Perkbox subscription is around £6/user/month, so a bundled perks portal is essentially worth £72/user/year on top of the leave-management value. For a 25-person team, that is £1,800 a year of perks-portal value embedded in the HR fee.

For SMBs choosing between two HR products at similar price points, bundled perks are a deciding factor. The catch: the catalogues vary in depth — the bundled portals in the bigger suites tend to have broader retailer line-ups, while LeaveApprove Perks is editorially curated. Most SMBs benefit from layering both — bundled in their HR product, plus a free public directory like LeaveApprove Perks.

Which one should you pick?

After many calls with UK SMB owners walking through this decision, a clear pattern:

• Sub-15 employees, simple needs — Timetastic or LeaveApprove. Cheap, quick to roll out, perks bundled into LeaveApprove.
• 15–50 employees, moderate HR-admin needs — LeaveApprove or Charlie HR. Choose LeaveApprove if leave + perks are the priorities; Charlie HR if performance-review and culture tooling matter more.
• 15–50 employees, regulated sector or tribunal risk — a suite that bundles an employment-law advice line. That advice line is the differentiator, and worth paying for if you are likely to need it.
• 50–250 employees, scaling fast — Personio. The breadth becomes worth the price.
• Sage Payroll customer, any size — Sage HR is usually the path of least resistance.

Common mistakes to avoid

From watching SMBs make and unmake HR-software choices:

• Picking on feature breadth instead of feature depth. A platform with 17 modules used at 30% depth is a worse outcome than one with 4 modules used at 90% depth.
• Buying performance-review modules pre-need. Most SMEs do not need the heavy module until 30+ headcount. Buying it earlier creates obligations to use it that distort behaviour.
• Underweighting the perks layer. Bundled perks are a real economic benefit. Cost it explicitly when comparing.
• Switching too often. Migration cost (data move, retraining, change-management) is genuinely high. Pick well, not quickly.

Bottom line

For a typical UK SMB the choice is between LeaveApprove (leave + perks focus, lower price), a bundled suite with an HR advice line, and Charlie HR (modern UX, no perks). Personio is the right answer once you cross 50 headcount. Pricing varies more than the vendors' marketing suggests — check per-employee cost, seat minimums and contract terms side by side rather than assuming parity. See the discount-platforms comparison.