If you're an investor, property owner, or expat with assets in either the United Kingdom or Ireland, understanding the differences in capital gains tax (CGT) between these two neighbouring nations is essential. The United Kingdom vs Ireland capital gains tax comparison for 2025/2026 reveals important distinctions in rates, exemptions, reliefs, and filing requirements that can significantly affect your net returns when you sell an asset.

Whether you're a UK resident considering Irish investments, an Irish national with UK property, or a dual resident navigating both systems, this comprehensive tax comparison United Kingdom Ireland guide will give you the clarity you need to plan effectively.

What Is Capital Gains Tax and Why Does This Comparison Matter?

Capital gains tax is a tax levied on the profit you make when you sell or dispose of an asset that has increased in value. Both the United Kingdom and Ireland impose CGT on a wide range of assets, including shares, investment properties, business assets, and certain personal possessions.

However, the two countries differ in several critical areas:

  • Tax rates applied to gains
  • Annual tax-free allowances (exemptions)
  • Available reliefs for entrepreneurs, business owners, and homeowners
  • Filing deadlines and payment schedules
  • Treatment of non-residents

Given the close economic ties between the UK and Ireland—and the significant number of people who live, work, or invest across both jurisdictions—a thorough capital gains tax comparison is invaluable for tax planning in 2025/2026.

CGT Rates: United Kingdom vs Ireland in 2025/2026

One of the most significant differences between the two countries lies in the headline CGT rates.

United Kingdom CGT Rates (2025/2026)

Following changes announced in the Autumn Budget 2024, the UK's CGT rates for 2025/2026 are as follows:

  • Basic rate taxpayers: 18% on most assets (including shares and other non-property assets); 18% on residential property gains
  • Higher and additional rate taxpayers: 24% on most assets; 24% on residential property gains

The key change from previous years is the alignment of rates. From 30 October 2024, the lower rate for non-property assets was raised from 10% to 18%, and the higher rate was raised from 20% to 24%. Residential property rates remain at 18% and 24%, so the system is now unified across asset types.

Business Asset Disposal Relief (BADR): The rate for qualifying disposals under BADR is 14% in 2025/2026, rising to 18% from April 2026. The lifetime limit remains £1 million.

Ireland CGT Rates (2025/2026)

Ireland applies a simpler, flat-rate structure:

  • Standard CGT rate: 33% on most chargeable gains
  • Entrepreneur Relief rate: 16% on qualifying gains up to a lifetime limit of €3 million (increased from €1 million as of Budget 2024)

The 33% rate applies regardless of income level, making Ireland's CGT system less progressive but more straightforward than the UK's.

Rate Comparison at a Glance

Feature United Kingdom (2025/2026) Ireland (2025/2026)
Standard CGT rate (lower) 18% 33%
Standard CGT rate (higher) 24% 33%
Residential property rate 18% / 24% 33%
Entrepreneur/Business relief rate 14% (rising to 18% from April 2026) 16%
Entrepreneur relief lifetime limit £1,000,000 €3,000,000

As this table clearly shows, the UK generally offers lower CGT rates than Ireland, particularly for individuals who are basic rate taxpayers. Ireland's flat 33% rate is among the higher CGT rates in Europe.

Use our United Kingdom Capital gains tax Calculator or Ireland Capital gains tax Calculator to model the exact impact on your specific gains.

Annual Exemptions and Tax-Free Allowances

Both countries offer an annual tax-free amount, but the difference in generosity is stark.

UK Annual Exempt Amount (AEA)

For the 2025/2026 tax year, the UK's Annual Exempt Amount is:

  • Individuals: £3,000
  • Trusts: £1,500

This is a significant reduction from previous years. The AEA was £12,300 as recently as 2022/2023, then cut to £6,000 in 2023/2024, and further reduced to £3,000 from 2024/2025 onwards. This erosion of the tax-free allowance means more individuals now face CGT liabilities on relatively modest gains.

Ireland Annual Personal Exemption

Ireland provides:

  • Individuals: €1,270 per year

Ireland's annual exemption has remained at €1,270 for many years and is notably lower than even the reduced UK allowance. In practical terms, the Irish exemption offers minimal shelter from CGT.

Practical Example: Selling Shares

Let's say you realise a gain of £10,000 (approximately €11,800) from selling shares in 2025/2026.

In the UK (higher rate taxpayer):

  • Taxable gain: £10,000 − £3,000 = £7,000
  • CGT at 24%: £1,680

In Ireland:

  • Taxable gain: €11,800 − €1,270 = €10,530
  • CGT at 33%: €3,475

The difference is substantial. On an equivalent gain, you would pay roughly twice as much CGT in Ireland compared to the UK for a higher rate taxpayer, and the gap widens further for basic rate UK taxpayers.

Key Reliefs and Exemptions Compared

Both the UK and Ireland offer reliefs designed to reduce or eliminate CGT in specific circumstances. Understanding these can save you thousands.

Principal Private Residence Relief

United Kingdom: Your main home is generally exempt from CGT under Private Residence Relief (PRR). If you've lived in the property as your primary residence for the entire period of ownership, the full gain is exempt. Partial relief applies if the property was not your main home for part of the time, or if it was used partly for business.

Ireland: Similarly, Ireland exempts gains on the disposal of your principal private residence. The relief covers the home and up to one acre (0.405 hectares) of land. Like the UK, partial exemptions apply if the property was not always your main residence or was partially used for business purposes.

Entrepreneur and Business Reliefs

United Kingdom – Business Asset Disposal Relief (BADR):

  • Reduced rate of 14% in 2025/2026 (18% from April 2026)
  • Lifetime limit of £1 million in qualifying gains
  • Available on disposal of all or part of a business, shares in a personal trading company (minimum 5% holding for at least 2 years)

Ireland – Revised Entrepreneur Relief:

  • Reduced rate of 16%
  • Lifetime limit of €3 million in qualifying gains
  • Available on disposal of qualifying business assets, with specific conditions around the nature and duration of the business

Ireland's higher lifetime limit of €3 million is a notable advantage for successful entrepreneurs, even though the relief rate is slightly higher than the UK's 14%.

Retirement Relief

Ireland offers a particularly generous Retirement Relief that has no direct UK equivalent:

  • If you're aged 55 or over and dispose of qualifying business assets, gains may be fully exempt from CGT up to €750,000 (disposal to a third party) or up to €3 million (disposal to a child)
  • Reduced limits apply for those aged 66 and over

The UK does not have a comparable retirement-specific CGT relief, although pension contributions and other planning strategies can mitigate liabilities.

Transfer Between Spouses

Both countries allow transfers of assets between spouses or civil partners on a no-gain, no-loss basis, meaning no CGT arises at the point of transfer. This is a valuable planning tool in both jurisdictions.

Filing Deadlines and Payment Rules

The administrative requirements for CGT differ significantly between the UK and Ireland.

United Kingdom Filing and Payment

  • UK residential property disposals: A CGT return must be filed, and tax paid, within 60 days of the completion date of the sale
  • Other assets: Gains are reported on your Self Assessment tax return, due by 31 January following the end of the tax year (e.g., 31 January 2027 for gains in 2025/2026)
  • Payment for non-property gains is also due by 31 January

Ireland Filing and Payment

Ireland has a split payment and filing system:

  • Gains arising 1 January – 30 November 2025: CGT must be paid by 15 December 2025 (the "initial period")
  • Gains arising 1 December – 31 December 2025: CGT must be paid by 31 January 2026 (the "later period")
  • Annual CGT return (Form CG1 or included in Form 11): Must be filed by 31 October of the following year (or mid-November if filing via ROS)

This means Ireland effectively requires earlier payment of CGT during the tax year itself, while the UK allows most non-property gains to be settled after the tax year ends. Missing these deadlines in either jurisdiction can result in penalties and interest charges.

Non-Residents and Double Taxation

For individuals who have ties to both countries, the treatment of non-residents and the UK-Ireland Double Taxation Agreement (DTA) are critically important.

UK Non-Resident CGT

Since April 2019, non-residents are liable to UK CGT on disposals of:

  • UK residential property
  • UK commercial property
  • Shares deriving 75%+ of their value from UK land
  • Interests in property-rich entities

Non-residents must report and pay CGT on UK property disposals within 60 days.

Irish Non-Resident CGT

Non-residents are generally liable to Irish CGT only on:

  • Irish land and buildings
  • Minerals and mining rights in Ireland
  • Shares deriving their value from Irish land, minerals, or exploration rights
  • Assets of an Irish branch or agency

The UK-Ireland Double Taxation Agreement

The UK and Ireland have a comprehensive double taxation agreement that prevents the same gain from being taxed twice. Key points include:

  • Immovable property (real estate): Taxed in the country where the property is located
  • Business profits and shares: Generally taxed in the country of residence, with credits available for tax paid in the other jurisdiction
  • Tax credits: If you are taxed on the same gain in both countries, you can typically claim a credit in your country of residence for CGT paid in the other country

If you have cross-border assets, professional advice is essential to ensure you are correctly applying the DTA and not overpaying tax. Understanding your UK income tax position and Irish income tax position is also important, as your overall tax profile can influence CGT planning.

Common Mistakes and Misconceptions

Navigating CGT across two jurisdictions is complex. Here are some of the most frequent errors people make:

  1. Assuming the same rules apply in both countries. Despite geographical proximity and shared language, the UK and Ireland have fundamentally different CGT systems. Don't assume a relief available in one country exists in the other.

  2. Forgetting the 60-day UK property reporting rule. UK property disposals must be reported within 60 days, regardless of whether you are resident or non-resident. Late filing attracts automatic penalties.

  3. Overlooking Ireland's split payment dates. Ireland's requirement to pay CGT in two instalments during and just after the tax year catches many taxpayers off guard.

  4. Ignoring currency conversion gains. If you hold assets denominated in a different currency (e.g., a UK resident holding Irish euro-denominated investments), currency fluctuations can create additional taxable gains or losses.

  5. Failing to claim the double taxation relief. If you are taxed in both jurisdictions on the same disposal, you must actively claim the credit—it is not applied automatically.

  6. Not considering entrepreneur or retirement reliefs. These reliefs can dramatically reduce your CGT bill, but they have specific qualifying conditions that must be met in advance of the disposal.

Frequently Asked Questions

Is capital gains tax higher in Ireland or the UK?

Yes, Ireland's standard CGT rate of 33% is significantly higher than the UK's rates of 18% (basic rate) and 24% (higher rate) for 2025/2026. However, Ireland's Entrepreneur Relief has a higher lifetime limit of €3 million compared to the UK's £1 million.

Do I have to pay CGT in both countries if I sell property?

If you are a resident of one country and sell property in the other, you may be liable to CGT in both jurisdictions. However, the UK-Ireland Double Taxation Agreement provides relief, typically through a tax credit in your country of residence for tax paid in the country where the property is located.

Can I use losses in one country to offset gains in the other?

Generally, no. Capital losses incurred in one jurisdiction can only be offset against gains in the same jurisdiction. UK losses offset UK gains; Irish losses offset Irish gains.

What happens if I move from the UK to Ireland (or vice versa)?

Changing your tax residency can have significant CGT implications. The UK has temporary non-residence rules that can "claw back" gains on assets disposed of during a period of non-residence if you return within five years. Ireland similarly has rules based on residency and domicile. Professional advice is strongly recommended before relocating.

Conclusion: Key Takeaways for 2025/2026

The United Kingdom vs Ireland capital gains tax landscape in 2025/2026 presents clear differences that can materially impact your investment returns and disposal planning:

  • The UK offers lower CGT rates (18%–24%) compared to Ireland's flat 33%, making it generally more favourable for standard asset disposals.
  • Ireland's annual exemption (€1,270) is lower than the UK's (£3,000), meaning Irish taxpayers have less shelter from CGT.
  • Ireland provides more generous entrepreneur and retirement reliefs, with a €3 million entrepreneur relief limit and unique retirement relief provisions.
  • Filing and payment deadlines differ significantly, with Ireland requiring in-year CGT payments and the UK imposing strict 60-day reporting for property disposals.
  • The UK-Ireland Double Taxation Agreement is critical for cross-border investors to avoid being taxed twice on the same gain.

For accurate, personalised calculations, use our United Kingdom Capital gains tax Calculator and Ireland Capital gains tax Calculator to model your specific situation.

This article is for informational purposes only and does not constitute tax advice. Tax laws change frequently; consult a qualified tax professional for advice specific to your situation.