If you’re selling a property or cashing in investments, the tax bill can sneak up on you. But knowing how to calculate capital gains tax ahead of time puts you in control. In Ireland, the standard rate is 33%; in the UK, residential property gains are taxed at 18% or 28% depending on your income. This guide walks through the formulas, exemptions, and rules for both jurisdictions so you can estimate your liability before you file.

4 related posts

Ireland CGT rate (most gains): 33% ·
UK CGT rate on residential property: 18% (basic rate) / 28% (higher rate) ·
UK annual CGT exemption (2024/25): £6,000 ·
Ireland annual CGT exemption: €1,270 ·
Ireland CGT rate for venture capital: 12.5% or 15%

Quick snapshot

1Confirmed facts
2What’s unclear
  • The 7 year rule for CGT in Ireland is often confused with CAT rules (Citizens Information)
  • Indexation relief for pre-2003 assets in Ireland requires asset-specific calculation (Citizens Information)
3Timeline signal
  • Ireland CGT due 15 December (Jan–Nov disposals) or 31 January (December disposals) (Citizens Information)
  • UK reporting required if total sale proceeds exceed £50,000 from 2023/24 (GOV.UK)
4What’s next
Rule Ireland UK
Standard CGT rate 33% (Citizens Information) 10%–20% (other assets) / 18%–28% (residential property) (GOV.UK)
Annual exemption €1,270 (Citizens Information) £6,000 (2024/25) (GOV.UK)
PPR relief Full exemption if lived in throughout ownership (Citizens Information) Final 6 years deemed occupied (if ever main home) (GOV.UK)
Filing deadline 15 Dec / 31 Jan (Citizens Information) Self-assessment by 31 January after tax year (GOV.UK)
Special rates 40% on certain foreign life policies; 80% windfall gains (Citizens Information) 10% for Business Asset Disposal Relief (pre-30 Oct 2024) (Ross Martin Tax Service)
Capital tax receipts (2024) €1.7 billion (35.4% of capital tax) (Irish tax authority via Revenue) Not specified
Bottom line: The pattern: Ireland applies a flat 33% rate with a small exemption; the UK uses a progressive system that can favour basic-rate taxpayers.

How to calculate capital gains tax with an example?

Step-by-step calculation for Ireland

To compute CGT in Ireland, start with the sale price, subtract the purchase price and allowable costs, then deduct the annual exemption (€1,270) and apply the 33% rate. For example: you buy shares for €10,000, sell for €25,000, with €500 in allowable costs. Gain = €25,000 – €10,000 – €500 = €14,500. Exemption = €14,500 – €1,270 = €13,230. Tax = 33% × €13,230 = €4,365.90. (official Irish guidance via Citizens Information)

Step-by-step calculation for the UK

For UK residential property, first deduct the annual exemption (£6,000) from the gain. Then apply the rate based on your income tax band. Example: gain of £50,000, exemption leaves £44,000 taxable. If you’re a basic-rate taxpayer, pay 18% on the residential property gain: £44,000 × 18% = £7,920. If you’re a higher-rate taxpayer, pay 28%: £44,000 × 28% = £12,320. (UK tax authority via GOV.UK)

Common adjustments and allowable costs

Both countries allow you to deduct costs directly related to buying and selling the asset: broker fees, legal fees, stamp duty, and improvement costs (not maintenance). In Ireland, indexation relief may apply for assets held before 2003, reducing the gain by an inflation factor. (Citizens Information)

Bottom line: The core formula is the same – gain less exemption times rate – but the rate and exemption values differ sharply between Ireland and the UK. For Irish investors with pre-2003 assets, indexation relief can significantly lower the bill.

What is the 7 year rule for capital gains tax in Ireland?

Understanding the 7 year rule in Irish tax law

The “7 year rule” is a common point of confusion. It actually applies to Capital Acquisitions Tax (CAT) – gift and inheritance tax – not CGT. Under CAT, gifts made more than 7 years before death may escape inheritance tax. For CGT, Revenue.ie does not list any standard 7 year rule. The holding period can affect indexation relief for assets acquired before 2003, but that is not a flat 7-year exemption. (official Irish guidance via Citizens Information)

Difference between CGT and Capital Acquisitions Tax (CAT)

CGT is triggered by a disposal (sale, gift, exchange) of an asset. CAT is triggered by receipt of a gift or inheritance. The 7 year rule is a CAT concept: if you give an asset and survive 7 years, the recipient may owe less CAT. For CGT, giving an asset is still a disposal and may trigger CGT based on the market value. (Citizens Information)

The catch

Many Irish property owners mistakenly think holding a property for 7 years eliminates CGT. It doesn’t. The only way to avoid CGT entirely is through Principal Private Residence relief or by using the annual exemption.

What is the 6 year rule for capital gains tax?

The 6 year rule for UK Principal Private Residence (PPR) relief

In the UK, if you sell a property that was your main home at any point, you may qualify for PPR relief. The final 6 years of ownership are automatically treated as if you lived there, even if you moved out – provided the property was your main home at some point. This can reduce or eliminate the CGT on the gain attributable to those 6 years. (UK tax authority via GOV.UK)

How the 6 year rule affects CGT on property

If you lived in a property for 2 years and then rented it out for 10 years, the final 6 years of ownership are still counted as deemed occupation. So only 4 years of the rental period would be chargeable to CGT (assuming no other reliefs). Other periods of absence (e.g., up to 4 years for work) may also qualify. (GOV.UK)

Why this matters

A UK landlord who moves out but keeps the property for 6+ years can sell without CGT on the last 6 years’ gain. Timing the sale after the 6-year deemed occupation window could save thousands.

How to avoid capital gains tax in Ireland on property?

Using the Principal Private Residence (PPR) exemption

If you live in your home throughout the entire period of ownership, the gain is fully exempt from CGT. Partial relief applies if the property was not your main home for part of the time. The exemption is automatic – you don’t need to claim it, but you must ensure the property was your sole or main residence. (official Irish guidance via Citizens Information)

Gifting property and the 7 year rule (CAT connection)

Gifting property to a child triggers CGT based on the market value (unless it’s a spouse). The 7 year rule does not apply to CGT – it affects CAT if the giver dies within 7 years. For CGT, the annual exemption (€1,270) can offset small gains, but for larger gifts, tax is due immediately. (Citizens Information)

Other exemptions and reliefs in Ireland

  • Transfer between spouses or civil partners – CGT-free.
  • No CGT on gains from certain government securities.
  • Retirement relief for business assets if you are 55+ and meet conditions.

Always check the latest Revenue guidance, as rules change. (Citizens Information)

Bottom line: For Irish homeowners, PPR relief is the most powerful tool. Spousal transfers and retirement relief offer additional paths, but gifting property still triggers CGT immediately.

Do I pay 18% or 28% CGT?

UK CGT rates on residential property

For residential property sold between 6 April 2024 and 29 October 2024, the rates were 18% for basic-rate taxpayers and 28% for higher-rate taxpayers. From 30 October 2024, the lower rate increased to 18% (was 10% for other assets) and the higher rate to 24% (was 20%). (UK tax authority via GOV.UK)

UK CGT rates on other assets

For assets like shares, business assets, and personal possessions (above £6,000), the rates are 10% for basic-rate and 20% for higher-rate taxpayers (before the October 2024 changes). After 30 October 2024, those rates rose to 18% and 24% respectively. Business Asset Disposal Relief remains at 10% for qualifying gains up to a lifetime limit. (tax advisory via Ross Martin Tax Service)

How to determine which rate applies

Your total income (including the gain) determines your tax band. If your income plus gain stays within the basic-rate band (£37,700 for 2024/25), you pay the lower rate. If it pushes you into the higher band, you pay the higher rate on the excess. The annual exemption (£6,000) is deducted first. (GOV.UK)

Bottom line: The rate you pay depends on your total taxable income. For a basic-rate taxpayer, a residential property gain of £50,000 after exemption costs £7,920; for a higher-rate taxpayer, the same gain costs £12,320.

Comparison: Ireland vs UK capital gains tax

Five key differences, one pattern: Ireland’s rate is flat and higher, while the UK uses a progressive system with lower rates for basic-rate taxpayers but a smaller exemption.

Dimension Ireland UK
Standard rate 33% (flat) 18%–28% (residential), 10%–20% (other)
Annual exemption €1,270 £6,000
PPR relief Full exemption if lived in entire ownership Final 6 years deemed occupied
Filing method ROS/myAccount by 15 Dec / 31 Jan Self-assessment by 31 Jan
Special reliefs Indexation for pre-2003 assets; 40% on foreign policies Business Asset Disposal Relief at 10%

The implication: Irish taxpayers pay a higher flat rate but have a larger potential relief through indexation. UK taxpayers benefit from a much larger exemption and progressive rates, though the rates for higher earners are still significant.

Confirmed facts & what’s unclear

Confirmed facts

  • Ireland CGT rate is 33% for most gains (Citizens Information)
  • UK residential property CGT: 18% or 28% (pre-October 2024) (GOV.UK)
  • Annual exemption amounts: €1,270 (Ireland), £6,000 (UK) (Citizens Information, GOV.UK)
  • PPR relief exists in both jurisdictions (Citizens Information)
  • Ireland CGT contributed €1.7 billion in 2024 (Irish tax authority via Revenue)

What’s unclear

  • Whether the 7 year rule applies to CGT in Ireland – it does not, but confusion persists (Citizens Information)
  • How indexation relief for pre-2003 assets is calculated per asset in Ireland

Expert perspectives

“Capital Gains Tax is payable on the chargeable gain when you dispose of an asset. The standard rate is 33%.”

— Revenue (Irish tax authority), official CGT guidance

“The annual exempt amount for 2024 to 2025 is £3,000 for individuals. You only pay CGT on your overall gains above your tax-free allowance.”

— HMRC, via GOV.UK (UK tax authority)

“If you sell your home, you may not have to pay CGT if you have lived in it throughout your ownership. This is called Principal Private Residence relief.”

— Citizens Information (official Irish guidance)

The pattern: For Irish property owners, ensuring PPR qualification or using the annual exemption is the path to avoid a 33% bill. For UK investors, timing the sale to benefit from the 6-year rule and staying within the basic-rate band can save thousands.

Related reading: Capital Gains Tax rates and allowances

Additional sources

kpmg.com, gov.uk, assets.publishing.service.gov.uk, ii.co.uk, gov.uk

For those focused on the UK, our UK capital gains tax calculator provides a free 2024/25 guide tailored to British rates and allowances.

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Frequently asked questions

What is the capital gains tax calculator and how does it work?

A CGT calculator is a tool that estimates your tax liability using the formula: (sale price – purchase price – allowable costs – annual exemption) × tax rate. Enter your numbers and select your jurisdiction to get an estimate.

How do I find the purchase price of an asset for CGT calculation?

Use the original purchase receipt or contract. If you inherited the asset, use the market value at the date of death. For gifts, use the market value at the date of transfer.

Can I deduct renovation costs from my capital gain?

Yes, but only capital improvements that add value (e.g., extension, new roof) – not routine maintenance. Keep receipts and invoices.

What happens if I don’t report a capital gain?

HMRC and Revenue can charge penalties and interest on unpaid tax. In the UK, failure to notify can result in a penalty of up to 100% of the tax due.

Are there any capital gains tax exemptions for small business owners?

Yes, both countries offer relief: Ireland has retirement relief for business assets; the UK has Business Asset Disposal Relief (10% rate) and Investors’ Relief.

How does the annual exemption work for couples?

Each individual has their own exemption. In the UK, the allowance is £6,000 per person; in Ireland, €1,270 per person. Couples can transfer assets between themselves tax-free to utilise both exemptions.

What is the difference between short-term and long-term capital gains in the UK?

The UK does not differentiate by holding period; all gains are taxed at the same rates regardless of how long you held the asset. However, the annual exemption and PPR relief depend on ownership length.

How do I calculate capital gains tax on foreign property?

Both Ireland and the UK tax worldwide gains. You must report the gain in your home country and may be able to claim foreign tax credit for tax paid abroad. Consult a specialist.