Understanding the deemed disposal rule in theory is one thing. Knowing what it means for your specific investment, with real numbers, is what actually helps you plan.
This article works through four practical scenarios: a standard 8-year trigger, what happens when you eventually sell after a deemed disposal, what happens if the market falls after the deemed disposal event, and what happens when you hold multiple purchase lots with different clocks. Each scenario uses illustrative figures.
For the full background on the rule, how the 2026 rate change works, and the broader planning context, see our main guide to This article assumes you already know what the rule is and focuses on how the numbers work in practice. The starting point: what the rule does
Revenue treats your ETF as if you sold it on the 8th anniversary of your purchase date, whether you sold anything or not. If the fund has grown, you owe exit tax at 38% on the gain, even though the money is still invested and you have received nothing.
Your cost basis then resets to the market value at the deemed disposal date. The 8-year clock starts again from that point.
You must declare and pay this tax yourself through self-assessment. Your investment platform does not handle it. Tax is due by 31 October of the year following the year in which the deemed disposal occurs. So if your 8-year anniversary falls in March 2026, the tax is due by 31 October 2027.
Example 1: The standard 8-year trigger
Setup:
•January 2018: you invest €20,000 in an accumulating Irish-domiciled ETF
•January 2026 (8 years later): the ETF is worth €34,000
The calculation:
•Gain: €34,000 minus €20,000 = €14,000
•Exit tax at 38%: €14,000 × 0.38 = €5,320 due
•Payment deadline: 31 October 2027
•New cost basis from January 2026: €34,000
•Next deemed disposal date: January 2034
What you need to have ready:
The €5,320 has to be paid whether or not you sell anything. If the ETF is your only liquid asset, you may need to sell roughly 15% of the holding to fund the bill, which itself triggers additional exit tax on those units. Planning ahead from around year 6 means setting aside cash gradually rather than facing a forced sale at the 8-year date.
Example 2: What happens when you eventually sell
Continuing from Example 1. Your cost basis after the deemed disposal in January 2026 is €34,000.
Setup:
•January 2028: you sell the entire ETF holding
The calculation:
•Gain since deemed disposal: €38,000 minus €34,000 = €4,000
•Exit tax on that gain: €4,000 × 0.38 = €1,520
•Total exit tax paid across both events: €5,320 + €1,520 = €6,840
The credit mechanism in action:
The €5,320 paid at the deemed disposal stage is credited against your liability when you eventually sell. You are not taxed twice on the same gain. The total tax across both events works out the same as if you had sold the entire holding at €38,000 in one go:
€38,000 minus €20,000 = €18,000 total gain × 38% = €6,840
The credit mechanism prevents double taxation. What it does not prevent is the cash flow impact: the €5,320 leaves your pocket in 2027, reducing the amount compounding in your portfolio for the next two years before you sell.
Example 3: The falling market scenario
The deemed disposal creates a tax bill based on the value at the 8-year date. If the market subsequently falls and you sell below that value, you can submit a claim to Revenue for overpaid tax due to the deemed disposal.
Setup:
•January 2026 deemed disposal: ETF value €34,000, exit tax of €5,320 paid, cost basis resets to €34,000
•March 2027: market falls, you sell the ETF at €28,000
The calculation:
•Your actual overall gain from original cost: €28,000 minus €20,000 = €8,000
•Exit tax on actual overall gain: €8,000 × 0.38 = €3,040
•You already paid: €5,320
•Refund due: €5,320 minus €3,040 = €2,280
The refund is claimed via your annual Form 11 return in the year of sale. You are never taxed on gains that did not ultimately materialise. The wrinkle is timing: you only get that money back when you finally sell. Until then, the tax you paid on a paper profit has been out the door for years, sitting on Revenue’s books and not in your portfolio compounding.
Example 4: Multiple purchase lots with separate clocks
This is where the administration becomes genuinely complex for regular investors.
If you invest a fixed amount every month, you create a separate 8-year clock for each purchase. After 8 years of monthly investing, you have up to 96 separate deemed disposal dates arriving one per month for the rest of your investing life. Each purchase lot has its own cost basis and its own 8th anniversary. You cannot average them out — each lot must be tracked separately.
Example with three lump sum purchases:
Purchase date
Amount invested
8-year deemed disposal date
January 2018
€10,000
January 2026
January 2020
€10,000
January 2028
January 2022
€10,000
January 2030
Each of these is a separate tax event with its own gain calculation, its own tax bill, and its own payment deadline. If all three have grown at different rates (which they will have, given different entry points in the market), the tax bills will differ too.
For someone who invested €500 per month from 2018 onwards, the administrative picture is more demanding still. Each monthly investment is a separate lot with its own clock. Keeping accurate records of every purchase date and the market value at each 8-year anniversary is not optional. Revenue can and does ask for this detail.
What changes if you make a partial sale during the 8-year period
If you sell some of your units before the 8-year anniversary, you pay exit tax on those units at the point of sale. The remaining units continue their existing 8-year clock from the original purchase date.
So selling part of your holding does not reset the clock on the remainder. The 8-year deemed disposal still applies to whatever you have left, calculated from the original purchase date.
The practical checklist before your 8-year anniversary
Based on the scenarios above, the steps that matter most before a deemed disposal date:
Know your exact dates. The clock runs from the date of purchase, not the calendar year. A purchase in September 2018 triggers deemed disposal in September 2026, not January 2026.
Calculate the likely bill from year 6. You have two years to set aside the cash if you start at year 6. Forced selling near the deemed disposal date often compounds the problem.
Check whether your ETF is accumulating or distributing. Accumulating ETFs reinvest dividends inside the fund and avoid interim chargeable events. Distributing ETFs pay out dividends which are themselves chargeable events under the exit tax regime at 38%, creating additional tax obligations before the 8-year date arrives.
Declare it yourself. Investment platforms do not handle exit tax automatically. You must declare it via Form 11 or Form 12 through Revenue’s ROS portal. For a deemed disposal event in 2026, the declaration and payment is due by 31 October 2027.
Keep every purchase record. Date, amount, number of units, price per unit. These are needed to calculate the gain accurately at each deemed disposal event, and for every lot separately if you hold multiple purchase dates.
Frequently asked questions
Do I pay tax even if my ETF has not grown? No. The deemed disposal only creates a tax charge if the fund is worth more than you paid. If it is worth the same or less, there is no tax due at the 8-year date.
What if I cannot afford to pay the tax without selling units? You will need to sell enough units to cover the bill. The units sold are themselves a chargeable event, so the effective tax cost of funding the deemed disposal can be higher than the headline number. Setting aside cash in advance avoids this.
Does the deemed disposal apply to pension funds or PRSAs? No. Pension funds and PRSAs have their own separate tax treatment. The deemed disposal rule applies to ETFs held in taxable accounts.
Is there any way to avoid the deemed disposal entirely? The rule applies to Irish and EU/EEA-domiciled ETFs held by Irish tax residents. Some US-domiciled ETFs are taxed under CGT rules at 33% with no deemed disposal, but Revenue’s classification of these is fact-specific, reporting requirements are more complex, and the analysis needs professional input before investing.
When is the tax actually due? By 31 October of the year following the year in which the 8-year anniversary falls. If your deemed disposal date is March 2026, the tax is due by 31 October 2027.
The bottom line
The deemed disposal rule is predictable once you understand it. The 8-year date is fixed from the moment you invest. The gain is calculable from your records. The tax bill is the gain multiplied by 38%. The credit mechanism prevents double taxation when you eventually sell.
What catches people is the cash flow requirement, the administrative complexity of multiple purchase lots, and the self-reporting obligation that platforms do not handle for you.
If you are approaching an 8-year anniversary on an Irish ETF holding, or want to understand how the rule applies to your specific portfolio, and we will work through the numbers with you. Disclaimer
This article is for general informational purposes only and does not constitute tax or financial advice. The figures used are illustrative examples only. Tax treatment depends on your individual circumstances, the specific ETF held, and Revenue’s classification of that fund. Always take advice from a qualified tax professional before making investment or reporting decisions based on this content.
