Calculate∑ What your result means
Capital Gains Tax is charged on the profit from selling an asset above your annual tax-free allowance, at rates that were aligned for property and other chargeable assets from the October 2024 Budget.
Capital Gains Tax (CGT) Calculator
Estimate CGT payable on a gain above your annual tax-free allowance.
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Verified for 2026-27Methodology 2026-27.1 · reviewed 2026-08-08 · review by 2027-03-01
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Change purchase price to see the effect on your result.
Understand your result
Clear context for the values above.
Purchase price
Purchase price is included so you can interpret this estimate and make a better-informed comparison.
Sale price
Sale price is included so you can interpret this estimate and make a better-informed comparison.
Your other taxable income
Your other taxable income is included so you can interpret this estimate and make a better-informed comparison.
Gain exempt through Private Residence Relief
Gain exempt through Private Residence Relief is included so you can interpret this estimate and make a better-informed comparison.
How to use this calculator
- 1Enter your current purchase price, sale price, your other taxable income (salary etc., for rate blending), gain exempt through private residence relief.
- 2Review the headline estimated cgt payable and the supporting figures beside it.
- 3Change one input at a time to see which assumption has the biggest effect.
- 4Confirm current UK rates and thresholds with an official source before acting.
Explore this calculator
What your result means →The headline estimated cgt payable is based on the inputs currently shown above.Key terms explained →Review the assumptions, applicable rules, timing and real-world fees before making a decision.How to use this calculator →Enter your figures, review the live result, compare scenarios, then save or print your estimate.The calculation formula →The calculation follows the standard relationship between the displayed inputs. Results update whenever an input changes.Worked example →Using the current values produces £17,864.Assumptions and limitations →Review the assumptions, applicable rules, timing and real-world fees before making a decision.Costs or factors not included →Review the assumptions, applicable rules, timing and real-world fees before making a decision.Frequently asked questions →How accurate is this estimate? What should I check before relying on it? Can I save or share the result?
▦ How this calculator works
The gain is the sale price minus the purchase price, less the £3,000 annual exempt amount. That taxable gain is stacked on top of your other taxable income: whatever falls inside your remaining basic-rate band (income up to £50,270 in total) is charged at 18%, and the rest is charged at 24% — so the two rates blend automatically if the gain straddles the boundary rather than one flat rate applying to the whole gain.
◇ Assumptions and what's not included
This ignores buying and selling costs (legal fees, agent fees), any improvement costs added to the cost base, the Personal Allowance taper above £100,000, and the Private Residence Relief that exempts gains on your main home for the period it was your only or main residence.
▤ What to do next
Add your allowable costs to the purchase price and check whether Private Residence Relief applies before relying on this figure, and report any taxable property gain to HMRC within 60 days of completion.
UK-specific contextFigures use GBP and current published rates and thresholds.
Reviewed for clarityUpdated 3 August 2026.
ImportantFor planning and educational use — not tax, legal or financial advice.
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Frequently asked questions
Is my main home's sale taxed under CGT?+
Usually not — Private Residence Relief exempts gains on a property that has been your only or main home for the whole period of ownership, which this calculator doesn't model.
Why are property and share CGT rates now the same?+
The October 2024 Budget aligned the rates for residential property and other chargeable assets like shares at 18%/24%, having previously been lower for non-property assets.
What is the annual exempt amount?+
It's currently £3,000 per person per tax year — gains up to that amount are tax-free, and any unused amount can't be carried forward.
Do I need to report a property gain quickly?+
Yes, UK residents generally must report and pay CGT on residential property gains within 60 days of completion, separately from your annual Self Assessment return.
Official references
Rules and thresholds used by this calculator are labelled for 2026–27 or formula-labelled period. Review the primary guidance before making a filing, borrowing, benefit or investment decision.
Last source review: 3 August 2026. Calculator results are estimates and may exclude circumstances described in the methodology.