Estimate tax on a chargeable gain after costs and the annual exempt amount. Use this when you are selling an asset and want a planning figure before you decide whether to crystallise the gain.
INVESTMENT AND ASSET GAINS
Capital gains tax calculator
Estimated result
£6,960
- Gross gain
- £32,000
- Chargeable gain
- £29,000
- Tax rate used
- 24.0%
A simplified illustration. Your actual rate depends on the asset type, your income and whether reliefs or losses apply.
Estimate the tax on a chargeable gain after costs, reliefs and the annual exempt amount.
Estimate tax on a chargeable gain after costs and the annual exempt amount. Use this when you are selling an asset and want a planning figure before you decide whether to crystallise the gain.
A sale proceeds figure of £75,000 with £40,000 purchase and improvement cost and £3,000 in fees leaves a gross gain of £32,000 before allowances. If the annual exempt amount removes £3,000, the taxable gain is smaller and the tax bill falls accordingly.
- The actual rate depends on your income, the asset type and whether reliefs or losses apply.
- Different assets can qualify for different treatment.
- Reliefs, carry-forward losses and reporting rules can materially change the final figure.
SOURCES & REVIEW
Checked against official guidance
Last reviewed 19 October 2026 · Rule version GB-2026.27.1
Daily/weekly source monitoring. If a source changes, the affected rule set is reviewed before publication.
All source links are kept visible so you can verify the figures used on this page.
Source line: Capital gains assumptions are checked against GOV.UK’s current CGT guidance.
GOV.UK: Capital Gains Tax ↗Sources, methodology and update policy →Report an issue or correction →WHY RESULTS DIFFER
Why two users can see different results
Why the result can differ
Different tax codes, payroll periods, Scottish bands, pension methods or lender assumptions can change the outcome.
One-off bonuses, pay frequency, overpayments, allowances and reliefs can move the result away from a simple annual estimate.
Where a rule depends on eligibility or legal status, this page shows an estimate and links to official guidance.
This section is intentionally repeated on key tools so the explanation stays near the result instead of being hidden in a separate policy page.
COMMON QUESTIONS
Frequently asked questions
Does the calculator handle every relief?
No. It is a planning estimate and some reliefs need separate checks.
Do income and gains tax bands interact?
Yes. Your income can affect the rate applied to a taxable gain.
Should I use this for a formal return?
No. A formal return may need a tax professional or HMRC filing check.