| Key Takeaways ✅ A share option gives you the right to buy company shares at a fixed price, and you don’t own the shares until you exercise. ✅ For a typical unapproved option, the gain on exercise is treated as employment income and taxed through payroll with Income Tax, USC and PRSI. ✅ Since January 2024 your employer handles that tax through payroll, but you may still need to provide the cash. ✅ Selling later is a separate event, and growth after exercise may face Capital Gains Tax at 33% ✅ A cashless exercise or sell to cover arrangement can fund the bill, but each route has its own trade-offs |
Share options have become a common part of pay packages across Ireland, especially in multinational, technology, pharmaceutical and financial companies. And at Money Maximising Advisors Limited, one thing comes up in our conversations again and again. An employee looks at a statement showing a €300,000 gain and quietly assumes that’s the money. It rarely is,1 The tax on share options catches out more smart people than almost anything else in personal finance, so let’s walk through it together, step by step, in language that makes sense.
First things first: what is a share option?
A share option gives you the right, but usually not the obligation, to buy a set number of your company’s shares at a fixed price, known as the strike price or exercise price, within a certain period. The important bit is this. You don’t actually own the shares until you exercise the option. Before that moment you hold a right, nothing more, and rights come with conditions and expiry dates attached.
Say you’re granted options over 10,000 shares at €20 each. A few years later the shares are trading at €50. You can now buy €500,000 worth of shares for €200,000. That €300,000 difference is your gain on exercise, and it looks wonderful on paper. The catch is what happens next.
A little vocabulary helps here too, because the plan documents throw these words around freely. The grant date is when the company awards you the options. The vesting period is the time over which you earn the right to use them, usually by staying employed or hitting performance targets. A vested option is one where those conditions have been met, though you still don’t own the shares. The exercise date is the day you actually use the option to buy them, and for tax purposes it’s the date that matters most. Finally, the expiry date is the last day the option can be used, and as we’ll see in a moment, leaving your job can replace it with a much earlier one.
The tax when you exercise
For most ordinary unapproved share options, that gain on exercise is treated as employment income. It’s not a tax-free bonus, and Revenue doesn’t see it as investment profit. It faces Income Tax, USC and employee PRSI, just like salary, and for someone on the higher rate the total deduction can be more than half of the gain. On our €300,000 example above, that could mean over €150,000 leaving before you’ve decided whether to sell a single share. You can read Revenue’s own overview of employment related shares if you want the technical detail.
Who actually pays it?
Since 1 January 2024, your employer handles the tax through payroll when you exercise. That’s a genuine improvement on the old system, where employees had to calculate and pay Relevant Tax on Share Options themselves within 30 days and file a separate return, a process plenty of people discovered only after missing the deadline. But be careful with the word handles. Payroll being the collection method doesn’t mean the money appears from nowhere. A large option gain can easily exceed your monthly net pay, so the practical question becomes where the cash comes from.
How people fund the tax bill
There are five main routes, and your plan rules decide which are open to you. The first is simply salary or bonus, where the deduction comes out of your pay, though for a big gain your net pay often can’t absorb it. The second is a cashless exercise, where all the shares are sold immediately on the day and the proceeds cover the purchase price, the tax and the fees, leaving you with the balance in cash. The third is sell to cover, where just enough shares are sold to pay the costs and you keep the rest invested. The fourth is share withholding, where the employer keeps back enough shares to cover everything and delivers the net number to you. And the fifth is personal funds, where you pay the exercise price and tax from your own cash so you can hold on to every single share.
There’s no single right answer here. A cashless exercise removes the risk of the price falling after you exercise, but it also ends your upside. Keeping everything means concentration risk, which we’ll come back to. If your scheme allows partial exercises, phasing them over more than one tax year can spread the gain and ease the cash flow, though it doesn’t defer tax that’s already due. And where the employer initially funds a shortfall, Revenue expects you to make that amount good, so agree the repayment terms in writing before you press the button.
Selling later: a second, separate tax
Exercise and sale are two different events, and this is where people get muddled. The exercise gain is an income tax matter. Once you own the shares, any further growth belongs to the Capital Gains Tax world. If your shares were worth €50 at exercise and you sell at €70, that extra €20 per share may face CGT at the standard rate of 33%, less your €1,270 annual personal exemption. That small exemption applies to capital gains only. It can’t shelter any part of the employment income gain, and a disposal generally needs to be reported to Revenue even when no CGT ends up being due.
And if the share price falls?
This is the painful one. Your exercise tax is based on the market value on the day you exercised. If the price falls afterwards, that tax doesn’t shrink with it. The loss sits in the CGT world instead, where it can only be used against capital gains, subject to the normal rules. This timing mismatch is the single biggest risk of exercising and holding a large position, and it’s exactly why the exercise decision, the funding decision and the investment decision should be made together rather than one at a time.
Should you keep the shares at all?
Exercising is only the first decision. Holding the shares afterwards is an active investment choice, even though they arrived through your job. Think about how much of your life already depends on this one company. Your salary does. Your bonus probably does. Perhaps your pension holds employer stock too. Adding a large personal shareholding on top puts your wealth and your income on the same horse. A simple test is worth applying here. If someone handed you the same amount in cash today, would you buy your employer’s shares with it? If the answer is no, keeping every share after exercise deserves a harder look, and our savings and investments team can help you spread that money sensibly instead.
A quick word on foreign currency
If your options are in US dollars or Pound sterling, which is very common with multinational employers, the Irish gain must be worked out in Euro using the Central Bank of Ireland exchange rate on the exercise date. Your broker’s settlement rate and fees will usually differ from that official rate, so the cash landing in your account may not match the payroll figures exactly. That mismatch isn’t an error, it’s just two different conversions happening on the same day. Keep every statement. A later sale is measured in euro at the relevant dates too, so currency movement can change your CGT result even if the share price itself barely moves.
Could the payroll deduction be wrong?
Sometimes, yes. A big deduction isn’t automatically an error, but mistakes do happen with the share count, the market value, the exchange rate or an out-of-date Revenue Payroll Notification. Compare your exercise confirmation, your payslip and your broker statement side by side. If the underlying data is wrong, ask your employer’s payroll or share plan team to correct the submission, because an end-of-year return won’t fix inaccurate employer data by itself. If the data is right but you’ve simply overpaid across the year, you can reconcile it through your PAYE Income Tax Return in myAccount and request your Statement of Liability. PRSI refunds are handled separately by the Department of Social Protection. And one thing worth saying plainly. A fall in the share price after exercise is not an overpayment of tax, however unfair it feels.
Not every scheme is taxed this way
Everything above describes the ordinary unapproved option, which is what most employees of multinationals hold. But Ireland does have kinder regimes. Qualifying options under the Key Employee Engagement Programme, known as KEEP, can be exempt from Income Tax, USC and PRSI at exercise, with CGT arising only when the shares are eventually sold. Revenue approved schemes such as SAYE and approved profit sharing arrangements have their own rules again. The conditions are strict and the scheme name alone proves nothing, so the very first question to answer about any award is exactly what type of plan it is and whether every condition has actually been met. It’s always the first thing worth checking on any statement.
Frequently Asked Questions
Do I pay tax when share options are granted to me?
For a typical short unapproved option exercisable within seven years, no tax arises at grant. The tax event comes later, when you exercise. Different rules can apply to longer options, so check what type you hold.
How much tax will I pay when I exercise my options?
The gain faces Income Tax, USC and employee PRSI through payroll, so for a higher rate taxpayer the combined deduction can exceed half the gain. Your exact figure depends on your bands, credits and PRSI position.
What is a cashless exercise?
It’s an arrangement where your shares are sold immediately on exercise and the proceeds fund the purchase price, the tax and the fees. It solves the cash problem, though the sale itself is still a disposal for CGT reporting.
Is the KEEP scheme taxed differently?
Yes. Qualifying options under the Key Employee Engagement Programme can be exempt from Income Tax, USC and PRSI on exercise, with CGT arising when the shares are eventually sold. The conditions are strict, so confirm your scheme actually qualifies rather than going by its name.
Do I need to file a tax return after exercising?
For gains realised since January 2024, you generally don’t need to file solely because of the exercise, since your employer reports it through payroll. You may still need to file for other reasons, such as dividends or selling the shares.
What records should I keep?
Keep your grant documents, vesting statements, exercise confirmations, payslips, broker contract notes, fee schedules and the exchange rates used. You’ll need them for any later CGT calculation and for checking that payroll got the numbers right.
Final Thoughts
Share options can genuinely change your financial life, but only if the tax and timing are handled with the same care that earned you the award in the first place. Remember the shape of it. The exercise gain is taxed like income through payroll, the later growth is a CGT matter, the funding route changes your risk, and currency adds a wrinkle for anyone in a multinational. If you’re sitting on a material award and wondering what to do with it, that’s exactly the kind of decision we help with every week. Bring us your option statement and vesting schedule, and we’ll look at it as part of your whole financial picture rather than in isolation. The first consultation is free, and it could be the most valuable hour your options ever buy you.
Make the Most of Your Share Options
Free consultation with our financial planning and tax team
Money Maximising Advisors Limited is regulated by the Central Bank of Ireland (C154250). This article is for information purposes only and does not constitute financial or tax advice.
