UK Capital Gains Tax
Calculator 2025/26
Calculate exactly how much CGT you owe on property, shares, crypto, or business assets. Unlike most calculators, this one correctly handles band-stretching — where a large gain pushes you from basic into higher-rate tax — and includes BADR for business disposals.
CGT rates for 2025/26 — what changed
The October 2024 Autumn Budget made the biggest single-year change to CGT in decades. From 30 October 2024, the rates on shares, crypto, and most other assets were raised from 10%/20% to 18%/24%, aligning them with residential property rates. The separate property premium is gone — all assets now use the same two rates.
| Asset type | Basic rate taxpayer | Higher rate taxpayer | Notes |
|---|---|---|---|
| Residential property | 18% | 24% | 60-day rule |
| Shares, funds, ETFs | 18% | 24% | Unified since Oct 2024 |
| Crypto assets | 18% | 24% | Each swap is a disposal |
| Business assets (BADR) | 14% flat rate | Rising to 18% Apr 2026 | |
| Annual Exempt Amount | £3,000 | Down from £12,300 in 2022/23 | |
Band-stretching — the calculation most calculators get wrong
CGT is not calculated in isolation. Your gains are added on top of your taxable income to determine which rate applies. This means a basic-rate taxpayer with a large gain may pay 18% on the portion that keeps them within the basic-rate band, and 24% on the portion that spills into the higher-rate band.
Sarah earns £38,000 per year. Her taxable income after the £12,570 personal allowance is £25,430. She sells shares and makes a gain of £30,000. After the £3,000 annual exemption, her taxable gain is £27,000.
The basic-rate band runs to £37,700 of taxable income. She’s already used £25,430 of it, leaving £12,270 of basic-rate band for her gains. So £12,270 of the gain is taxed at 18% (= £2,208.60), and the remaining £14,730 at 24% (= £3,535.20). Total CGT: £5,743.80.
A calculator that simply asked “are you a basic or higher-rate taxpayer?” would have got this wrong.
The £3,000 annual exempt amount
Every individual can make up to £3,000 of capital gains each tax year completely free of CGT. This is applied after losses and before rates are applied. It cannot be carried forward — if you don’t use it, you lose it. If you own assets jointly with a spouse or civil partner, you each get your own £3,000 allowance, effectively doubling it to £6,000.
The AEA has fallen sharply: it was £12,300 in 2022/23, £6,000 in 2023/24, and £3,000 from 2024/25 onwards. This means far more disposals now result in a tax liability than before.
Property: the 60-day reporting deadline
If you sell UK residential property and owe CGT, you must report and pay within 60 days of completion using HMRC’s online Real Time Capital Gains Tax Service. This applies to buy-to-let properties, second homes, and inherited property — not your main home (which is covered by Private Residence Relief).
Missing the 60-day deadline results in an automatic £100 penalty, with further penalties for delays beyond 6 and 12 months. The 60-day clock starts from the completion date, not exchange. For other assets (shares, crypto), you report through Self Assessment by 31 January after the tax year ends.
You can deduct: the original purchase price, Stamp Duty Land Tax paid on purchase, legal and conveyancing fees (both purchase and sale), estate agent fees on sale, and the cost of capital improvements (extensions, loft conversions, new kitchens/bathrooms that add value — not repairs or maintenance). You cannot deduct mortgage interest, contents, or normal maintenance costs.
Business Asset Disposal Relief (BADR)
BADR — formerly Entrepreneurs’ Relief — allows qualifying business owners to pay a reduced CGT rate on the first £1 million of lifetime gains from business disposals. The rate is currently 14% (from 6 April 2025), rising to 18% from April 2026.
To qualify you must, for at least 2 years up to the disposal date: hold at least 5% of the shares and voting rights in a trading company, and be an employee or director of that company. The business must be a trading company (not primarily an investment company). BADR is claimed on your Self Assessment tax return.
Private Residence Relief — selling your home
Your main home is exempt from CGT in most circumstances through Private Residence Relief (PRR). The full relief applies if you’ve lived in the property as your main home for the entire period of ownership. If you’ve had periods of non-occupation (e.g. you let it out, worked away, or it was empty), only a proportion of the gain is exempt.
The final 9 months of ownership always qualify for relief regardless of occupation — reduced from 18 months before April 2020. If you have two properties, you can elect which one is your main home, but the election must be made within 2 years of acquiring the second property.
Frequently asked questions
From take-home pay to redundancy rights — all the numbers you actually need.