Capital Gains Tax Calculator UK
Use our Capital Gains Tax Calculator UK to quickly estimate how much tax you need to pay when selling assets like property, shares, or investments. Whether you’re an investor, landlord, or business owner, this tool helps you calculate your capital gains tax (CGT) accurately and instantly.
No complex formulas. Just clear results.
What is Capital Gains Tax?
Capital Gains Tax (CGT) is the tax you pay on the profit (gain) when you sell or dispose of an asset that has increased in value.
You only pay tax on the gain, not the total sale price.
How to Use the Capital Gains Tax Calculator UK
Using the calculator is simple:
- Enter the purchase price of the asset
- Enter the selling price
- Add any allowable costs (fees, improvements, etc.)
- Select your income tax band
- Click calculate
You’ll instantly see:
- Your total gain
- Tax-free allowance applied
- CGT payable
How Capital Gains Tax Is Calculated
Step 1: Calculate Your Gain
Gain = Selling Price – Purchase Price – Costs
Step 2: Deduct Annual Allowance
Each individual gets a tax-free CGT allowance (Annual Exempt Amount)
Step 3: Apply CGT Rates
For Most Assets:
- 10% (Basic rate taxpayers)
- 20% (Higher rate taxpayers)
For Residential Property:
- 18% (Basic rate)
- 24% (Higher rate) (updated rates)
Who Should Use This Tool?
This calculator is ideal for:
- Property investors and landlords
- Stock market investors
- Business owners selling assets
- Individuals selling second homes
- Anyone disposing of valuable assets
Example Calculation
Let’s say:
- You bought an asset for £100,000
- Sold it for £180,000
- Costs = £5,000
Gain = £75,000
After allowance, CGT is calculated based on your tax band and asset type.
What Costs Can You Deduct?
You can reduce your taxable gain by including:
- Legal fees
- Stamp duty
- Estate agent fees
- Improvement costs (not maintenance)
Common Capital Gains Tax Mistakes
- Forgetting to apply the tax-free allowance
- Not including allowable costs
- Using the wrong CGT rate
- Confusing income tax with CGT
Our Capital Gains Tax Calculator UK helps you avoid these errors.
FAQs – Capital Gains Tax Calculator UK
How much is Capital Gains Tax in the UK?
It depends on your income and the type of asset. Rates range from 10% to 24%.
Do I pay CGT on my main home?
Usually no, due to Private Residence Relief (with some exceptions).
What is the CGT allowance?
You get a tax-free allowance each year (Annual Exempt Amount), which reduces your taxable gain.
Can I reduce my capital gains tax?
Yes, by using allowances, deducting costs, and offsetting losses.
Is this calculator accurate?
Yes, it provides a reliable estimate based on current UK CGT rules.
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