Scaling HR in a fast-growing Irish company
Reviewed by Mellow Editorial Team, HR & payroll content team
Scaling HR in a fast-growing Irish company means building people processes that can handle double or triple the headcount without breaking — before the cracks appear, not after.
Know when informal HR stops working
Most founders manage HR informally when the team is small. That works up to a point. Around 10–15 employees, the cracks usually start showing: inconsistent onboarding, ad hoc pay reviews, no clear disciplinary process, managers making things up as they go.
The honest trigger to formalise is not a headcount number — it is the first time something falls through the gap. A contract issued late, a probation period missed, a leaver paid incorrectly. If you wait for a second incident, you are already behind.
Get your employment contracts and policies right early
Every employee in Ireland must receive a written statement of core terms within five days of starting, and a full written contract within one month. This is a legal requirement under the Employment (Miscellaneous Provisions) Act 2018, not optional paperwork.
As you scale, templating matters. You want contracts that are legally sound but also consistent — so that when you hire your twentieth engineer, the terms are not materially different from your fifth unless there is a deliberate reason.
Beyond contracts, the policies that cause problems when absent are:
- Disciplinary and grievance procedures — required under the Industrial Relations Act and referenced in the WRC Code of Practice
- Annual leave policy — employees are entitled to 4 working weeks of statutory leave; your policy needs to cover carry-over, approval and how leave interacts with sick absence
- Sick leave policy — since the Sick Leave Act 2022, statutory sick pay applies from day one of employment; the number of qualifying days has been phasing up
- Remote and hybrid working policy — if any of your team works remotely, you need a written policy covering equipment, expenses and data handling
Build a payroll process that scales with you
Payroll in Ireland is more complex than it looks. Every time you hire, you need to register the employee with Revenue, operate PAYE in real time and submit a payroll submission on or before each payday via ROS. There is no monthly reconciliation at year end that catches errors — Revenue sees your numbers in real time.
The main components to manage correctly:
- Income tax at 20% up to roughly €44,000 for a single person, 40% above that — applied against tax credits, not a personal allowance
- USC at banded rates of 0.5%, 2%, 3% and 8% depending on earnings
- PRSI Class A — employees pay approximately 4.1% and employers pay approximately 11.15% on gross pay
Employer PRSI at 11.15% is a significant cost that many founders underestimate when budgeting headcount. A €60,000 salary costs the business materially more once employer PRSI is factored in.
Looking ahead, pension auto-enrolment — the government's My Future Fund scheme — is being introduced from 2026. Employers will be required to make pension contributions for eligible employees who have not opted out. If you are scaling now, you need to build this into your cost modelling.
A payroll system that handles real-time submissions, manages tax credit certificates and integrates with your HR records is not a luxury at scale — it is a control.
Structure your HR function for the stage you are at
There is no single right answer on when to hire an HR person versus use fractional support versus outsource. What matters is matching the resource to the risk and volume.
A rough guide:
- Under 25 employees — a founder or office manager with solid external support (employment law advisor, payroll bureau) usually covers it
- 25–75 employees — a part-time or fractional HR lead with documented processes makes sense; hiring volume and ER casework typically justifies it
- 75+ employees — a full HR function with dedicated payroll, at minimum one HR generalist and a clear escalation path for legal questions
The mistake growing companies make is hiring an HR coordinator when they actually need an HR manager with employment law confidence. Title-matching to seniority matters.
Keep compliance ahead of headcount
Irish employment law generates obligations that attach automatically as your headcount grows. A few worth tracking:
- Once you have employees, you are subject to the Employment Equality Acts — discrimination claims have no minimum service requirement
- TUPE (Transfer of Undertakings) applies if you acquire another business or take over a service contract — employees transfer with their existing terms
- The Right to Request Remote Working under the Work Life Balance and Miscellaneous Provisions Act 2023 creates a formal process you need to be able to respond to
- Data protection obligations under GDPR apply to employee data from day one — HR records, performance notes, sick leave records all require a lawful basis and retention schedule
The practical move is a compliance calendar — a simple document that tracks renewal dates, statutory reviews and regulatory changes. Update it once a quarter. It takes twenty minutes and saves you from being caught out by something you knew was coming.
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