UK Capital Gains Tax calculator
Estimate CGT exposure on shares, property, crypto, and other assets for 2026/27. Annual exempt amount and rates by band handled.
How is UK Capital Gains Tax calculated?
CGT is charged on the gain when you dispose of an asset that has increased in value. For 2026/27 the annual exempt amount is £3,000 — gains above that are taxable. For most assets and UK residential property the rates are 18% within the available basic-rate band and 24% above it. Qualifying Business Asset Disposal Relief gains are charged at 18% from 6 April 2026. This estimate uses the figures you enter; it does not calculate private residence relief, share or crypto pooling, or every relief.
Sources: GOV.UK CGT rates, Business Asset Disposal Relief, and CGT reporting and payment.
Practical guidance for real-world disposals and tax planning.
Tax Year & Asset Type
Disposal Details
Enter the main figures that affect your gain. Include allowable enhancement and disposal costs where relevant.
Tax Context
Income after your Personal Allowance and other Income Tax reliefs. Used to work out the available basic-rate band.
If you have other chargeable gains, the annual allowance may already be partially used.
The calculator applies the annual exempt amount configured for the selected tax year. Other gains can reduce the amount still available.
Reliefs & Special Circumstances
Select any applicable reliefs. Where relief is too nuanced to model precisely, the tool will flag for professional review.
Your estimate will appear here
Enter your asset and disposal details, then press "Calculate CGT" to see your estimated gain and tax exposure.
- Gain or loss on disposal
- Losses and allowance applied
- Estimated CGT and effective rate
- Net proceeds after tax
Disclaimer: This calculator provides general estimates for planning purposes only. Results depend on the assumptions entered and do not constitute tax advice. Actual CGT may vary depending on reliefs, asset history, pooling rules, and other factors.
What this calculator helps you understand
Gain vs Loss
See whether your disposal creates an estimated gain or loss.
Costs and Allowances
Understand how allowable costs, losses, and annual allowance can affect the result.
Asset Type Matters
Property, shares, crypto, and business assets can carry different CGT treatment.
Planning Context
Use the estimate as a planning tool before disposal or filing.
This tool provides a practical estimate based on selected assumptions. It does not calculate private residence relief, share or crypto pooling, or every relief. Actual outcomes depend on asset history, allowable costs, reliefs, losses, and your wider tax position.
Check the reporting route before you rely on an estimate
UK residential property
A taxable gain on most UK residential-property sales must be reported and paid within 60 days of completion. This calculator cannot decide whether private residence relief applies.
GOV.UK: property CGT reporting and paymentShares and cryptoassets
The estimate does not calculate share pooling, same-day or 30-day matching, or cryptoasset pooling. Check the records and calculations before reporting a gain or loss.
Other disposals
Other gains may be reported through Self Assessment, or eligible UK residents may be able to use HMRC’s real-time CGT service. The right route depends on the disposal and your filing position.
Need help with a disposal, gain, or CGT return?
RR Accountants helps taxpayers, landlords, investors, and business owners review disposals, calculate gains properly, handle self-assessment, and plan around CGT before mistakes become expensive.
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Frequently Asked Questions
Need help with CGT, self-assessment, or tax planning?
RR Accountants supports individuals and businesses with capital gains reporting, self-assessment, property tax, business disposals, and practical tax advice. For a UK residential-property disposal, reporting and payment may be due within 60 days of completion.