Yes, you can. Irish law has no problem with you holding down a PAYE job and running a side business as a sole trader at the same time. Plenty of people do exactly that: the developer building websites at weekends, the teacher selling prints online, the electrician doing nixers after hours.
The real questions are practical ones. What does your contract of employment actually allow? Do you have to tell your boss? How do you fit the work in without burning out, and at what point does the side income justify going full-time? This guide deals with the juggling act itself, with the tax rules kept to a short summary near the end. If you want the registration and tax detail in depth, we cover that separately in our guide to being a sole trader and a PAYE employee.
What should you check in your employment contract before starting?
Before you set up a business alongside a job, read your contract properly. Most Irish employment contracts say nothing about outside work. Some do, and those clauses are enforceable, so this is the first thing to check when becoming a sole trader on the side.
Look for these in particular:
- Exclusivity or "whole time and attention" clauses. These require you to devote your working capacity to your employer. They rarely ban evening or weekend activity outright, but they can.
- Non-compete and conflict of interest clauses. Selling a similar service to your employer's customers is the fastest way to turn a side project into a disciplinary problem.
- Intellectual property clauses. Some contracts claim ownership of anything you create during your employment, not just during working hours. If your side business involves code, designs or writing, this matters a lot.
- Working time. Under Irish working time rules, average working hours are capped at 48 hours per week. A heavy second workload can put your employer in an awkward position if they know about it.
If a clause looks like a blocker, ask for written consent rather than hoping nobody notices. Most employers will agree once they see no competition and no impact on your day job.
Do you have to tell your employer about your side business?
No, unless your contract requires it. There is no general legal duty in Ireland to declare a side business to your employer. Just as importantly, your employer cannot see your sole trade through payroll. PAYE and self-assessment run on separate tracks, and Revenue does not share your tax return details with your employer.
Discretion has limits, though. If you register a business name with the CRO, that record is public. A website, a Google Business Profile or a LinkedIn update can all surface in a five-second search. Many people find that a short, honest conversation up front beats being discovered later, especially in smaller Irish industries where everyone knows everyone.
How do you manage the hours without burning out?
Time, not tax, is what kills most side businesses. Your PAYE job takes the best hours of your day, so the sole trade gets evenings, weekends and whatever energy is left. A few habits make the difference:
- Pick fixed slots for client work and protect them, even if it is just Tuesday evenings and Saturday mornings.
- Batch your admin. Invoicing, receipts and bookkeeping can usually be handled in one evening a month if you keep on top of it.
- Open a separate bank account from day one. Untangling personal and business spending at year end wastes hours you do not have.
- Say no to work that pays badly. With limited hours, one underpriced job crowds out a better one.
And keep your employer's resources out of it. No company laptop, no work email, no calls to your own clients from your desk. That single rule prevents most of the conflicts that get people into trouble.
What are the tax basics when you are employed and self-employed?
Here is the short version. Your job is taxed through PAYE as normal, and nothing changes there. Your side profits are taxed separately through self-assessment, on top of your salary, so you pay income tax at your marginal rate along with USC and PRSI.
|
Obligation |
Threshold or rate |
What it means for you |
|
Register with Revenue for income tax |
Net self-employed income over €5,000 |
You need to register as a self-employed person once net profit passes this point |
|
File a Form 11 each year |
Non-PAYE income over €5,000 net or €30,000 gross |
You become a chargeable person and file an annual tax return by 31 October |
|
Class S PRSI |
4.2% since 1 October 2025 |
Paid on side profits; it builds your own social insurance record |
|
VAT registration |
€42,500 services or €85,000 goods since 1 January 2025 |
You must register for VAT once turnover is likely to pass the threshold |
One nuance worth knowing: register on time rather than at the deadline. Revenue treats a sole trade as starting when you begin trading, not when you get around to the paperwork. Keep receipts for everything, claim your allowable expenses, and the side income often costs less in tax than people fear. Our guide to how much a sole trader can earn before paying tax walks through the numbers.
What happens to your pension and employee benefits?
This is the knock-on most people miss. Your workplace pension, sick pay and paid leave come from your employment only. Side profits earn none of those automatically, so as the sole trade grows, you are gradually swapping insured income for uninsured income.
You can plug some of the gap yourself. Personal pension contributions attract tax relief within age-related limits, and that relief applies across your combined earnings, which catches out people who already max their contributions through payroll. Class S PRSI does keep your State Pension record ticking over. And if a mortgage is on the horizon, remember that lenders will want certified accounts for the self-employment, usually covering two or more years.
When does the side income justify going full-time?
There is no magic number, but some signals repeat across the people we work with. The side business consistently nets half or more of your salary. You are turning down work for lack of hours. Repeat clients and referrals keep arriving without marketing spend. You have six months of living costs saved as a buffer.
The decision is rarely just financial. Walking away from employer pension contributions, paid holidays and predictable income deserves honest weighing, not optimism. It is also the natural moment to revisit your structure, because a limited company can become more tax-efficient once profits outgrow what you need to live on. We compare the two in what's better, a sole trader or a company.
What else do people ask about running a business alongside a job?
Do I need a separate business bank account as a sole trader?
Not legally, but practically yes. A dedicated account gives you a clean audit trail, makes bookkeeping faster and stops you missing expense claims buried in personal statements.
What if my side income stays under €5,000 net?
You still need to declare it to Revenue, but you can usually do so through myAccount rather than registering for self-assessment. Keep records anyway, because if the income grows you will want evidence of when things changed.
Can I claim expenses against my side income?
Yes, anything spent wholly and exclusively for the trade: materials, software, insurance, a reasonable share of home utilities if you work from home. Our guide to claiming household expenses as a sole trader covers the apportionment rules.
Will my PAYE tax credits change?
Your tax credits stay with your employment by default, and the side profits are simply taxed on top through your return. Some people ask Revenue to reduce their credits to spread the cost through the year, but that is a choice, not a requirement.
Do I need an accountant for a small side business?
Not legally. In practice, the first Form 11 with mixed PAYE and trading income is where most people make expensive mistakes, so even a once-a-year review pays for itself.
Ready to put your side business on a proper footing?
Running a job and a sole trade together is completely doable; thousands of people in Ireland manage both every year. The ones who do it well keep clean records, respect their contract, and get the registration done before Revenue comes asking. If you would rather hand the tax side to someone who does this daily, our tax return service handles registration, bookkeeping setup and Form 11 filing for employed sole traders. Get in touch today and book a consultation.
Disclaimer: This guide is for general information purposes only and does not constitute professional advice. Speak to a qualified accountant about your specific circumstances before acting on anything covered here.