UK CGT Allowance Checker 2025-26
Every UK taxpayer gets a £3,000 annual exempt amount for capital gains in 2025-26. This means the first £3,000 of net gains in the tax year is completely tax-free. Use this checker to see where you stand.
Enter your total gains and losses so far this tax year to see how much of your exemption remains and your estimated CGT liability.
Are you a basic or higher rate taxpayer?
About the Annual Exempt Amount
Every UK individual receives a Capital Gains Tax annual exempt amount — currently £3,000 for the 2025-26 tax year (6 April 2025 to 5 April 2026). This is the amount of net capital gains you can realise each year without paying any CGT. The exemption resets every 6 April and cannot be carried forward— if you don't use it, you lose it.
Each person has their own exemption, so a married couple or civil partners have a combined £6,000 between them. Transferring assets between spouses before sale is a legitimate way to utilise both exemptions. Note that even if your gains fall within the exempt amount and no tax is due, you must still report to HMRC if your total disposal proceeds for the year exceed £12,000. Failing to report can result in penalties. For the full breakdown of rates and bands, see our full CGT rates guide.
What to Do If You're Over the Limit
If your net gains exceed £3,000, there are several strategies to consider before 5 April. Tax-loss harvesting involves selling positions currently at a loss to offset your gains — the loss reduces your net gain and can bring you back within the exempt amount. You could also consider a bed-and-ISA strategy, where you sell shares in your taxable account and repurchase them within your ISA to shelter future growth — see our guide on bed and breakfast alternatives. Another option is to split disposals across tax years — sell some shares before 5 April and the rest after, giving you two annual exemptions. Use our Section 104 pool calculator to model different disposal scenarios.
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