Capital Gains Tax UK Calculator
Print| Total Net Capital Gain | £0.00 |
| Taxable Gain (after £3,000 allowance) | £0.00 |
The Capital Gains Tax UK Calculator helps UK taxpayers, property investors, share traders, and business owners calculate their exact Capital Gains Tax (CGT) liability owed to HM Revenue & Customs (HMRC). Capital Gains Tax is levied on the profit (“gain”) realized when selling or disposing of an asset that has increased in value.
Whether you sold a second residential property, disposed of stocks/shares outside an ISA, or realized cryptocurrency gains, this calculator incorporates current UK tax bands, annual exempt amounts, and property rates.
The UK Capital Gains Tax Formula
Capital Gains Tax in the UK is calculated by determining the net taxable gain after allowable deductions and multiplying by the taxpayer’s applicable HMRC CGT tax rate:
1. Net Taxable Gain
Net Taxable Gain = Sale Price - Original Purchase Price - Allowable Expenses - Annual Exemption Allowance
2. CGT Tax Liability
Capital Gains Tax Owed = Net Taxable Gain * Applicable CGT Tax Rate (%)
Where:
- Sale Price: Gross Proceeds received from selling or disposing of the asset.
- Allowable Expenses: Stamp Duty (SDLT), legal costs, estate agent fees, and capital improvement expenditures.
- Annual Exemption Allowance: The HMRC tax-free CGT allowance for individuals (£3,000 for the 2024/25 tax year).
- Applicable CGT Rate: Determined by your taxable income band and asset type (General Assets vs. Residential Property).
UK CGT Tax Rates & Allowances Benchmark (2024/25)
The table below summarizes official HMRC Capital Gains Tax rates based on income tax bands and asset category:
| Income Tax Band | Annual CGT Allowance | CGT Rate: Shares & Other Assets | CGT Rate: Residential Property | HMRC Tax Treatment |
|---|---|---|---|---|
| Basic Rate Taxpayer (£12,571 to £50,270) | £3,000 | 10.00% | 18.00% | Lower tax rates apply within unused basic income band. |
| Higher Rate Taxpayer (£50,271 to £125,140) | £3,000 | 20.00% | 24.00% | Standard higher rate tax tier (Property rate reduced from 28% in 2024). |
| Additional Rate Taxpayer (Over £125,140) | £3,000 | 20.00% | 24.00% | Top tax bracket for high earners. |
Step-by-Step UK Property CGT Calculation Example
A higher-rate taxpayer sells a second residential buy-to-let property for £350,000 that was purchased for £250,000. Legal fees and estate agent commissions total £10,000, and structural home improvements cost £15,000.
Step 1: Calculate Gross Profit (Gain)
Gross Gain = £350,000 - £250,000 = £100,000
Step 2: Deduct Allowable Expenses
Deductible Expenses = £10,000 (Fees) + £15,000 (Improvements) = £25,000
Gain After Expenses = £100,000 - £25,000 = £75,000
Step 3: Apply HMRC Annual CGT Allowance
Net Taxable Gain = £75,000 - £3,000 (Allowance) = £72,000
Step 4: Calculate CGT Owed at Higher Residential Property Rate (24%)
Capital Gains Tax Owed = £72,000 * 0.24 = £17,280
Conclusion: The seller owes £17,280 in Capital Gains Tax to HMRC, payable within 60 days of completion via the HMRC online UK Property CGT service.
Frequently Asked Questions
Do I pay Capital Gains Tax when selling my main home in the UK?
In most cases, no. If the property is your primary home and you satisfy all conditions for Private Residence Relief (PRR), you are 100% exempt from paying Capital Gains Tax on the sale.
What is the reporting deadline for residential property sales in the UK?
If you sell a UK residential property that incurs Capital Gains Tax, you must report the gain and pay the tax owed to HMRC within 60 days of completion using HMRC’s Capital Gains Tax on UK property service.
Can spouses transfer assets tax-free to reduce Capital Gains Tax?
Yes. Transfers of assets between married couples or civil partners living together are treated as occurring on a “no gain / no loss” basis. This allows couples to utilize two annual tax allowances (£6,000 total) and leverage lower tax bands.
Are assets held inside an ISA or SIPP subject to Capital Gains Tax?
No. Stocks, shares, funds, and corporate bonds held within an Individual Savings Account (ISA) or a Self-Invested Personal Pension (SIPP) are completely exempt from UK Capital Gains Tax.