The decision about whether to run payroll in-house or outsource it to a bureau is one that many small business owners treat as a cost comparison — how much does the payroll software cost versus how much does a bureau charge per payslip? Framed that way, in-house often looks cheaper.
Framed properly — accounting for the true time cost, the compliance risk, the cost of errors, and the increasing complexity of Irish payroll obligations — outsourcing is considerably more competitive than it appears in a simple fee comparison. For many small employers, particularly those just setting up payroll for the first time, it is the right choice.
The True Cost of In-House Payroll
Running payroll in-house for a small Irish business involves more than pressing a button on payroll software. Each pay period requires:
Retrieving updated Revenue Payroll Notifications (RPNs) for all employees before processing. Entering any pay changes, new starters, leavers, or adjustments. Calculating PAYE, PRSI, and USC correctly for each employee. Processing any benefit-in-kind adjustments. Since September 2025, calculating and processing auto-enrolment pension contributions. Submitting the Payroll Submission Request (PSR) to Revenue on or before the pay date. Generating payslips and distributing them to employees.
Then, after payroll:
Reconciling the PAYE, PRSI, and USC liability for the period. Transferring pension contributions to the NAERSA auto-enrolment system. Maintaining payroll records for each employee.
For a business with five employees, running a monthly payroll properly takes somewhere between two and four hours per month when done thoroughly. At a realistic hourly value for the owner’s time of €50–€100 per hour, that is €100–€400 of owner time per month — €1,200 to €4,800 per year.
A payroll bureau servicing five employees typically charges in the range of €50–€120 per month — well under the value of the time that would otherwise be spent.
The Risk Cost of In-House Payroll
Time cost is only part of the equation. The risk cost of in-house payroll — the financial exposure that arises when things go wrong — is often overlooked but can be significant.
Payroll errors are more common in self-processed payroll than in professionally managed payroll. The consequences of errors include:
Employees underpaid or overpaid, requiring adjustments that damage trust and create administrative work. Wrong tax deductions — using the wrong RPN rate, applying emergency tax unnecessarily, or failing to apply updated rates — resulting in employees with incorrect year-to-date tax positions. Missed PSR submissions to Revenue, generating late filing exposure. Incorrect employer PRSI calculations — particularly around the Class S versus Class A distinction for proprietary directors. Auto-enrolment errors — incorrect enrolment, incorrect contribution rates, or missing contributions.
Revenue’s real-time reporting system means errors are visible to Revenue in near-real-time. A pattern of late submissions or incorrect deductions is flagged in Revenue’s risk assessment systems and can trigger a compliance check.
A professional payroll bureau takes on operational responsibility for accuracy. If they make an error, their professional indemnity insurance covers the cost of correction. If you make an error in-house, you bear the cost.
The Complexity Trajectory
The complexity of Irish payroll has increased materially over the last five years, and the trajectory is upward. PAYE Modernisation (2019) added real-time reporting. Sick pay obligations (2023) added new leave calculations. Auto-enrolment (2025) added pension contribution processing. Gender pay gap reporting (for larger employers) requires payroll data extraction and analysis. Employment law changes require contracts and payroll to stay current.
For a business owner who is not a payroll specialist, staying on top of this complexity while also running a business is a genuine burden. A bureau whose entire function is payroll compliance tracks these changes as part of their service.
Who Should Outsource?
The case for outsourcing is strongest when any of the following apply:
You have fewer than 20 employees and payroll is processed monthly. At this scale, the economics of a bureau are almost always favourable when time is properly valued. You or your in-house person lacks formal payroll training and relies on trial and error. Your payroll involves any complexity — variable hours, shift patterns, multiple PRSI classes, cross-border workers, benefit-in-kind calculations. You have experienced payroll errors that created employee relations issues or Revenue queries. You are adding employees and the payroll function is growing in complexity ahead of your capacity to manage it.
Who Should Keep It In-House?
The case for in-house payroll is stronger when:
You have a dedicated, trained payroll administrator who manages it as a primary responsibility — not a side task for the office manager who also does reception and ordering. Your payroll is large enough that the per-employee cost of a bureau is material relative to your overhead budget, and the internal capacity to manage it efficiently is genuinely present. You have a strong payroll software system that automates the RPN retrieval, PSR submission, and compliance tracking — not a legacy system or a spreadsheet.
The Hybrid Approach
Many businesses operate a hybrid model: the business processes its own payroll but has its accountant or a bureau review the payroll returns quarterly and conduct an annual reconciliation. This provides a compliance check without the full cost of bureau management.
The review identifies accumulated errors before they become enforcement issues, ensures that RPN changes have been correctly applied, and confirms that the PRSI classes, auto-enrolment deductions, and year-to-date figures are accurate.
For businesses that are confident in their in-house capability but want an independent check, this hybrid approach is a sensible middle ground.
Whatever approach you use, the priority is that payroll is accurate, timely, and compliant. You can find more on this topic across our payroll and employment guides. The cost of getting it wrong — in Revenue penalties, employee relations issues, and management time spent on correction — consistently exceeds the cost of getting it right from the start.
Paddy Malone FCA AITI
Paddy is the principal of Malone & Co. Chartered Accountants in Dundalk. A Fellow of Chartered Accountants Ireland and a Chartered Tax Consultant with the Irish Tax Institute, he has been advising businesses across County Louth and the North-East for over 35 years.