Capital Gains Tax Calculator

Start with your gain (what you sold the asset for, minus what you paid for it and allowable costs), deduct any losses, then deduct your tax-free Annual Exempt Amount (£3,000 for individuals in 2026/27). What's left is your taxable gain. For individuals, this is then taxed at 18% for whatever falls within your remaining basic rate Income Tax band, and 24% above that. Trustees and personal representatives pay a flat 24% instead, with no basic-rate portion.

The tax-free Annual Exempt Amount is £3,000 for individuals and £1,500 for most trusts in the 2026/27 tax year. You only pay Capital Gains Tax on gains above this amount, and it renews every tax year - unused allowance can't be carried forward.

Not any more. Since 30 October 2024, residential property and other chargeable assets (shares, crypto, business assets and so on) share the same rate structure: 18% within your basic rate band, 24% above it. Before that date, property was taxed at higher rates (18%/24%) than other assets (10%/20%), which is a common source of out-of-date advice online.

Usually not. Selling your only or main home is normally fully exempt from Capital Gains Tax under Private Residence Relief. Relief can be restricted if you let out part of the property, used part of it exclusively for business, or the grounds (including all buildings) are 5,000 square metres or more (just over an acre) - in those situations, check GOV.UK's Private Residence Relief guidance or speak to an accountant, since this calculator doesn't work out a restricted, partial relief figure.

Your taxable gain is added on top of your other taxable income to work out how much of it falls in your remaining basic rate Income Tax band (£37,700 for 2026/27) versus above it. If your other income already uses up your whole basic rate band, your entire taxable gain is charged at the higher 24% rate; if you have little other income, more of your gain can benefit from the lower 18% rate.

No. Capital Gains Tax is not a devolved tax, so it always uses the same UK-wide basic rate band width, regardless of whether you pay Scottish Income Tax on your salary. This is different from Income Tax itself, where Scotland has its own bands and rates.

It's a relief that lets you pay a flat 18% Capital Gains Tax rate (from 6 April 2026) on qualifying gains, instead of the standard 18%/24% split, when you sell all or part of a business you've owned for at least 2 years, or qualifying shares in a personal trading company. It has a £1 million lifetime limit across all your claims - this calculator can't track your cumulative use of that limit, so check your remaining allowance with HMRC or an accountant.

Broadly: what you paid for the asset, plus costs of buying and selling it (such as legal fees, Stamp Duty, or estate agent fees), plus the cost of any improvements that add lasting value (like an extension), but not routine repairs or maintenance. This calculator asks you to enter your total gain directly, already worked out using these rules - see GOV.UK's guidance on working out your gain for the full method.

Yes. Allowable losses, whether made in the same tax year or brought forward from an earlier year, are deducted from your gains before your tax-free Annual Exempt Amount is applied. If your losses are bigger than your gain for the year, the unused amount can normally be carried forward to set against gains in a future tax year.

For UK residential property (other than an exempt main home), you must report and pay within 60 days of completion, using HMRC's separate property Capital Gains Tax service. For most other assets, such as shares or business assets, you report the gain through Self Assessment, with tax due by 31 January following the end of the tax year - though you can also choose to report and pay earlier using HMRC's 'real time' service.

No, not on the same amount. Capital Gains Tax applies to the profit (gain) you make when you sell or dispose of an asset that's increased in value. Income Tax applies to income you receive, such as salary or rental profit. The two are separate taxes on separate things, though your other Income Tax position (specifically, how much of your basic rate band is used up) affects which Capital Gains Tax rate applies to your gain.

No. This calculator gives an illustrative estimate based on the rules described on this page, for a single, straightforward disposal. It doesn't cover non-UK residents, carried interest, Gift Hold-Over Relief, Investors' Relief, incorporation relief, EIS/SEIS deferral relief, mixed BADR and non-BADR gains in the same tax year, or a restricted (partial) Private Residence Relief calculation. For anything beyond a simple, single disposal, treat this figure as a starting point and confirm the exact amount with an accountant or HMRC.