From 5 to 50 employees in Ireland: an HR roadmap
Reviewed by Mellow Editorial Team, HR & payroll content team
Growing from five to fifty employees is less about a single moment of change and more about a series of thresholds where informal practices stop working. The guidance below maps out where those thresholds fall and what you need to have in place before you cross them.
Getting your employment fundamentals right early
Before you hire employee number six, check that your existing five are properly documented. Every employee in Ireland must have a written statement of core terms within five days of starting work, and a full written contract within one month. The core terms include job title, pay, hours, and place of work.
Beyond contracts, you need a small set of policies from day one: a grievance procedure, a disciplinary procedure, and a dignity at work policy. These are not optional extras. The Workplace Relations Commission (WRC) will expect to see them if a complaint is ever made, and tribunals look poorly on employers who cannot produce documentation.
Annual leave entitlement in Ireland is four working weeks, and your payroll system must track accruals accurately. Errors here are a common source of WRC complaints.
Payroll compliance as you scale
Irish payroll runs on a real-time reporting system called PAYE Modernisation. Every time you pay an employee, you must submit a payroll submission (PSR) to Revenue via ROS on or before the payment date — not monthly, not in arrears. As headcount grows, the operational pressure of getting this right increases.
The tax structure your employees sit under:
- Income tax at 20% on earnings up to roughly €44,000 for a single person, and 40% on income above that. Ireland uses tax credits rather than a personal allowance, so each employee's net tax liability depends on the credits they hold.
- USC (Universal Social Charge) applies in bands: 0.5%, 2%, 3%, and 8% depending on income level.
- PRSI Class A applies to most employees: the employee contributes approximately 4.1% and you as the employer contribute approximately 11.15%.
That employer PRSI contribution is a real cost to model when budgeting headcount. At fifty employees, it is material.
From 2026, pension auto-enrolment — the scheme known as My Future Fund — is being introduced. Employers will be required to enrol eligible employees and make matching contributions. If you are hiring now, you should build this obligation into your cost modelling.
The HR policies you need to add as you grow
Around the ten-to-fifteen employee mark, informal management stops scaling. This is when you need written policies that are consistently applied, because inconsistency is what generates claims.
Between roughly 10 and 20 employees, focus on:
- A performance management process (even a simple one)
- A probationary period policy with clear review points
- A leave management policy covering parental leave, sick leave, and force majeure — all of which have statutory entitlements in Ireland
- A remote or hybrid working policy if relevant, given the right to request remote work under Irish law
Between 20 and 50 employees, add:
- A formal pay and grading structure, even a basic one
- An employee handbook that consolidates all policies in one accessible document
- A structured onboarding process so knowledge transfer is not dependent on whoever happens to be available
- A data protection policy compliant with GDPR, covering how you handle employee data
Statutory obligations that kick in at specific thresholds
Some legal obligations in Ireland are headcount-triggered.
At 50 employees, you are required to consider requests for employee information and consultation arrangements under the Employees (Provision of Information and Consultation) Act 2006. If employees formally request it, you must establish a framework for informing and consulting them on significant business developments.
Health and safety obligations also grow with scale. While the Safety, Health and Welfare at Work Act 2005 applies from your first employee, the practical complexity of your safety statement and risk assessment grows significantly as you add roles, locations, and shift patterns.
If you are operating across multiple sites or with employees in different countries, payroll and HR complexity compounds quickly. How Mellow runs payroll across six countries on one platform gives a sense of what that looks like in practice.
Building the HR infrastructure before you need it
The single most common mistake growing Irish businesses make is treating HR infrastructure as something to build after problems arise. By the time a WRC complaint lands, or a key employee resigns without a handover process, or Revenue queries a payroll submission, the absence of structure is already costing you.
The practical sequence:
1. Contracts and core policies — before hiring
2. Accurate real-time payroll — from day one
3. Performance and leave management processes — before you hit fifteen people
4. Employee handbook and pay structures — before thirty
5. Information and consultation readiness — before fifty
None of this requires a large HR team. It requires decisions made early, written down clearly, and applied consistently.
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