Capital Gains Tax Calculator
Work out how much tax you'll pay on capital gains - Updated for 2026/27
Paying Capital Gains Tax
You might need to pay Capital Gains Tax (CGT) if you make a profit from investments or selling valuable assets. These can include things like money you make from trading cryptocurrency, selling shares, or the sale of a property which isn’t your main home, such as a buy-to-let property or a second home.
You’ll only pay tax on the gain you make from the asset’s increase in value, not the full amount you get for it, so working out the gain is very important!
It means you can subtract what it cost you to acquire the asset, as well as other costs for things like improvements you made to it, or selling expenses such as advertising or agent fees. There’s also a £3,000 tax-free allowance called the annual exempt amount which will be deducted from your capital gains.
Working out Capital Gains Tax
There are different rates of Capital Gains Tax – 18% and 24%. The amount of Capital Gains Tax you owe depends on the total amount you earn, and what type of asset you need to pay it on. We explain this in more detail in our article about CGT.
For example, there is a separate rate of CGT payable on gains you make from disposing of property. Even though this is currently the same rate paid on other types of asset, the different rates and thresholds can change so it’s important to double-check before calculating anything.
FAQs
You might owe Capital Gains Tax if you sell, give away, or exchange assets which have increased in value, and the total amount of gains you make in a tax year is over the £3,000 tax free allowance.
The kind of tax you need to pay on crypto depends on how you earn it. You’ll usually pay Capital Gains Tax on money you get from trading crypto, or income tax if you’re involved in mining and staking. We have a separate crypto tax calculator which deals with both types of tax.
Capital Gains Tax tends to crop up because you’ve sold an asset for more than you paid for it, but it’s actually based on an asset’s disposal. This can mean that you sold it, but a disposal can also mean you swapped it for something else, gave it away to someone other than your spouse. It can even apply if you were compensated for it in some way – such as with an insurance payout.
This varies depending on whether you need to tell HMRC about capital gains you make on property or other types of asset.
You’ll need to tell HMRC about Capital Gains on property within 60 days of the completion date.
Other types of gains must be reported by 31st January following the end of the tax year in which they happen. They can be reported through Self Assessment if you’re registered, or with the real time reporting service if you’re not.
You’ll be able to deduct the cost of any expenses which relate to the asset or it’s disposal. For example, money you spent on repairs or improvements, or advertising and seller’s fees.
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