The Share Scheme Tax Trap in Ireland: What Employees and Employers Are Getting Wrong

For years, the conventional wisdom on employee share schemes in Ireland ran along the lines of “you only pay tax when you sell”. It was never true, but it was a forgiveable mistake while Revenue’s attention was elsewhere. It is not a forgiveable mistake any more. Revenue’s share scheme compliance project yielded €22.8 million in 2025 and the same project is still working through 2021 to 2023 option exercises. If you exercised options in those years, or if you operate a share scheme for staff, the chances of a Revenue letter landing have risen sharply.

Layer on top of that the rule change in Finance (No. 2) Act 2023 that moved share option gains into PAYE from 1 January 2024, and you have a tax landscape that punishes the old “leave it until I file my return” approach. Share-based pay is a powerful incentive and a useful financial benefit for staff, but it only works when both the employer and the employee understand what they owe and when. This article unpacks where the trap sits, who is most exposed, and what employees and employers should be doing now.

What Is the Share Scheme Tax Trap and Why It Is Catching So Many People

The “share scheme tax trap” is the gap between what employees and employers think will happen tax-wise and what actually happens. The usual misunderstandings sound like this:

• “It’s only taxed when I sell the shares.”
• “It’s a capital gains tax issue, not income tax.”
• “My employer will handle the whole thing through payroll.”
• “It’s a Revenue-approved share scheme, so there’s no real tax to worry about.”

Each of those statements is wrong, or at best only partly right. Most share-related rewards in Ireland are employment-related securities, which means the gain is treated as employment income and attracts income tax, USC and (in many cases) PRSI, not just capital gains tax on a later sale. The trap closes when the cash bill arrives long before the shares are sold, or when an old exercise from 2021 or 2022 lands in a Revenue follow-up letter with interest and penalties attached.

The people most exposed right now are: employees who exercised options between 2021 and 2023, employers running unapproved option plans, payroll and finance teams that have not yet operationalised the PAYE change, and senior executives sitting on long-tail share awards.

What Changed for Share Options and PAYE After Finance (No. 2) Act 2023

Until the end of 2023, gains on unapproved share options were collected through the Relevant Tax on Share Options (RTSO) system. The employee was personally responsible for filing an RTSO1 form and paying the tax within 30 days of exercise. Finance (No. 2) Act 2023 changed that. From 1 January 2024, gains on unapproved share options are taxable under PAYE, and the employer is responsible for operating the PAYE withholding through payroll on exercise.

What “taxable under PAYE” means in practice:

• The employer must deduct income tax, USC and (where applicable) PRSI through payroll at the date of exercise, just as it would for a cash bonus of the same gain. Employees pay income tax at their marginal rate on the exercise gain via the payroll deduction.
• The cash to fund the deduction must come from somewhere. Either the employee provides the cash, the employer organises a sell-to-cover via the broker, or the gross gain is grossed-up appropriately.
• The employee no longer files an RTSO1; the charge is captured through the employer’s regular PAYE submission.

This is a process change as much as a tax change. Plenty of employers have the right intent but no clean data flow from the broker or scheme administrator into payroll, which is where exercises in 2024 and 2025 are quietly going wrong.

Which Irish Share Plans Are Most Likely to Trigger Unexpected Tax?

Not every employee share scheme is equally risky. The trap is concentrated in a few plan types.

• Unapproved share options / unapproved share schemes: the bread-and-butter share option arrangement at most Irish start-ups and scale-ups. Gains are now collected under PAYE. The full charge to income tax, USC and PRSI lands on exercise.
• KEEP options (Key Employee Engagement Programme): intended to provide a more favourable tax outcome for qualifying SMEs and key employees. The relief is conditional and easy to lose. If the conditions are not met, the option falls back to unapproved treatment with all the usual exposures.
• Approved share schemes (APSS, SAYE, ESOT): more favourable tax treatment by design, but not “tax-free by default”. Holding periods, eligibility rules and reporting requirements still apply, and the relief can be clawed back where conditions are breached.
• Restricted Share Units (RSUs) and share awards: commonly used by multinationals operating in Ireland. The taxable event is generally on vest, when restrictions lift, with the employer required to operate PAYE on the value of the shares delivered.

The number of options granted at the start of a plan is rarely the issue; the trap forms later, at exercise or vest, when the employer must approve the operational steps to bring the gain into PAYE. KEEP and APSS in particular sit alongside ordinary employer pension contribution arrangements, and the interaction between these reward elements deserves a proper joined-up review rather than scheme-by-scheme treatment.

What creates the trap across these plan types is misunderstanding the chargeable event, assuming “Revenue approved” equals “no payroll work required”, and ignoring USC and PRSI exposure on top of income tax.

When Do You Actually Pay Tax on Shares and Share Options in Ireland?

The taxable event depends on the type of plan, not on when the employee feels the gain.

• Share options: the charge to income tax, USC and PRSI arises on exercise, when the employee acquires the underlying shares at the agreed price. From 1 January 2024 this is collected through PAYE.
• Share awards and RSUs: typically chargeable on vest, when the shares are delivered and restrictions lift. PAYE applies on the market value of the shares at that point.
• Approved schemes: the charging point can be deferred or reduced where the plan rules and statutory conditions are met. Where conditions fail, the deferral collapses and the gain becomes taxable as employment income.
• Disposal: when the shares are eventually sold, capital gains tax can apply to the further increase in value between acquisition and sale. The annual CGT exemption and standard rate apply.

This is where the “dry tax” problem bites. An employee can exercise options, hold the shares, watch the market drop, and still owe income tax on the exercise gain calculated by reference to the higher market price on the original exercise date. The same tax bill that looked manageable when the shares were worth €10 still applies when they are worth €4, and the employee has no liquid gain to pay it from.

Why 2021 to 2023 Option Exercises Are Still in Revenue’s Spotlight

Revenue’s 2025 compliance project focused on share scheme activity in the years immediately before the PAYE switch. The project yielded €22.8 million and is still running. Letters continue to land about exercises in 2021, 2022 and 2023, particularly where:

• The employee filed an RTSO1 late or not at all.
• The gain on exercise was treated as a capital gain rather than employment income.
• USC and PRSI exposure was missed alongside income tax.
• The employer’s share scheme return (the annual Form RSS1 or related filings) does not match the individual’s own filings.

Common red flags that prompt Revenue follow-up include large option gains relative to salary, repeated exercises across multiple tax years, and obvious inconsistencies between the employer’s RSS1 return and what the individual declared. For an employee, a Revenue letter is rarely a fishing expedition; it usually means Revenue already has a data point that does not add up.

The Most Common Mistakes Employees Make

The mistakes that drive most of the exposure are surprisingly consistent year after year.

• Assuming the employer “handled it” without checking the payslip and confirming income tax, USC and PRSI were deducted on the gain.
• Treating an option gain as capital gains tax on the eventual sale, missing the employment-income charge on exercise entirely.
• Forgetting USC and PRSI on top of income tax. The combined rate for a higher-rate taxpayer can sit above 50%, not the 40% mentally pencilled in.
• Exercising options without selling enough shares (or setting cash aside) to fund the resulting tax liability.
• Assuming KEEP relief applies automatically. KEEP has strict conditions on company size, qualifying trade, employee status and holding periods; missing any of them flips the option back to unapproved treatment.

The practical fix is not complicated. Keep the option agreement, the grant date, the exercise notice and the payroll evidence in one folder. Get a tax calculation before exercising, especially where there is no same-day sale to fund the cash bill. Save the broker confirmations for any subsequent disposal so the CGT base cost is easy to evidence later.

What Employers Are Getting Wrong

On the employer side, the move to PAYE has exposed weaknesses that did not matter under the old RTSO regime, when the employee carried the filing burden.

• Broken data flow: exercises happen through a broker or share plan administrator, but the data does not reach payroll cleanly or on time, so the PAYE deduction is missed or made late.
• Inconsistent treatment: two employees exercising the same plan in the same month receive different tax treatment because one was treated as PRSI-exempt and the other was not, with no clear rationale on file.
• Poor employee communication: employees are not told what their cash needs will be on exercise and end up with a payroll deduction they did not expect.
• Reporting gaps: the annual employer share scheme return (RSS1, KEEP1 and related) is incomplete or inconsistent with payroll, which is exactly the kind of mismatch Revenue’s data analytics now picks up automatically.

The compliance actions that fix this are not glamorous, but they work:

1. Confirm the classification of every active plan: unapproved, approved (APSS / SAYE / ESOT) or KEEP. Tax treatment flows from classification.
2. Build an operating process for option exercises: data flow from broker or administrator into payroll, with a target turnaround that lets PAYE be operated on time.
3. Review USC and PRSI treatment case by case, particularly for non-resident or internationally mobile employees.
4. Reconcile the annual share scheme return to payroll and to the broker records before filing. Mismatches are the single biggest trigger for Revenue contact.
5. Document board approvals, plan rules, valuations and exercise records so the audit trail is ready if Revenue asks.

How Approved Schemes Differ and Whether They Still Carry a Trap

“Revenue approved” is not the same as “tax-free”. Approved schemes give a more favourable treatment in specific conditions but still demand careful operation.

1. APSS (Approved Profit-Sharing Scheme): the employer gives you shares from a trust and, subject to holding the shares for a minimum period, the appropriation can be free of income tax. USC and PRSI typically still apply at appropriation. Early withdrawal or breaches of the holding period trigger an income tax charge.
2. ESOT (Employee Share Ownership Trust): a trust structure that can work alongside APSS. The structural reliefs sit at trust level; personal tax treatment for the employee still depends on the underlying APSS appropriation and holding rules.
3. SAYE (Save As You Earn): employees save monthly contributions over a fixed period and use the savings to acquire company shares at a pre-set price. The exercise itself is often free of income tax where the scheme rules and conditions are met, but USC and PRSI can still apply and any subsequent sale falls under CGT.
4. KEEP: aimed at qualifying SMEs to give key employees option-based rewards taxed as a capital gain on sale rather than as employment income on exercise. The conditions are strict: company size, qualifying trade, employee working time, and holding period. Miss any of them and the option falls back to unapproved treatment.

Scheme	Main charge point	Key risk if conditions fail
Unapproved options	Exercise, with income tax, USC, PRSI under PAYE	Dry tax bill where shares are held, not sold
KEEP options	Sale, with CGT only (if all conditions met)	Falls back to unapproved treatment if eligibility breaks
APSS / ESOT	Appropriation, often free of income tax (USC/PRSI may apply)	Early withdrawal triggers income tax charge
SAYE	Exercise, often free of income tax	USC/PRSI still in scope, CGT on later sale
RSUs / share awards	Vest, with income tax, USC, PRSI under PAYE	Late payroll capture, mismatch with overseas payroll

FAQs About the Share Scheme Tax Trap in Ireland

Are share options in Ireland taxed under PAYE now?

Yes, for gains arising from 1 January 2024 onwards. Under Finance (No. 2) Act 2023, gains on unapproved share options are collected through the employer’s PAYE payroll, including income tax, USC and PRSI where applicable. The old RTSO1 self-assessment route no longer applies to current exercises.

If I exercise options but don’t sell the shares, do I still owe tax immediately?

Yes. The taxable event is the exercise, not the sale. You owe income tax, USC and PRSI on the difference between the market value of the shares at exercise and the exercise price, even if you hold the shares and never sell them. Plan for the cash impact before exercising.

Is KEEP automatically tax-free, and what happens if I don’t meet the conditions?

KEEP is not automatic. The favourable CGT-only treatment applies only where the company, the employee and the option all meet the statutory conditions, including company size, qualifying trade and minimum holding period. If the conditions fail, the option is treated as an unapproved option and the gain on exercise is subject to income tax, USC and PRSI under PAYE.

Do USC and PRSI apply to share option gains and share awards?

USC almost always applies. PRSI generally applies for Class A employees, with some specific exceptions depending on social insurance class and residence. The combined effective rate for a higher-rate taxpayer can comfortably exceed 50%, so it is worth modelling the full position before exercising.

Why is Revenue contacting people about 2021 to 2023 option exercises now?

Revenue’s share scheme compliance project has been working through the years immediately before the PAYE change, where mistakes were most likely. The data sources include employer share scheme returns (RSS1, KEEP1), payroll records and individual filings. Mismatches between those sources are what trigger most of the follow-up letters.

Get Share Scheme Tax Right Before Revenue Contacts You

Share schemes are one of the best tools an Irish company has to reward and retain key staff. They are also one of the easiest places to walk into a six-figure tax problem that nobody saw coming. The combination of the PAYE switch in 2024 and Revenue’s active compliance work on 2021 to 2023 exercises means the cost of getting it wrong is real and rising.

At Kinore, our team supports both employees and employers on share scheme tax. For employees, we review past exercises, estimate exposure on open years, and plan future exercises so there is no cash tax shock. For employers, we run a payroll and compliance review of share plans, confirm PAYE readiness, and tighten the data flow from broker to payroll to share scheme return. Senior-led, with dedicated client management. Speak with our team to book a share option exercise check or an employer share scheme compliance review before Revenue makes the next move.