UK Capital Gains Tax calculator 2026/27
Estimate CGT after losses and the annual exempt amount, split across the 18% and 24% rates.
Example figures Change them to match your circumstances.
How the Capital Gains Tax estimate works
This broad Capital Gains Tax estimate starts with disposal proceeds, deducts entered acquisition and allowable transaction costs, then applies current-year losses and the annual exempt amount before the 18% and 24% rates.
Rules checked
Read the checking method
What the result includes
- Gain before and after current-year losses
- The £3,000 annual exempt amount
- Rate-band interaction with other taxable income
What to have ready
- Acquisition cost and disposal proceeds
- Allowable buying, selling and enhancement costs
- Current and brought-forward losses, checked separately
Questions about Capital Gains Tax
Is the sale price itself taxed?
No. CGT generally starts from the gain after allowable acquisition and disposal costs, not the whole proceeds.
Does the calculator cover every relief?
No. Private Residence Relief, Business Asset Disposal Relief, share matching, non-residence and special asset rules need a transaction-specific calculation.
About this estimate
Private Residence Relief, Business Asset Disposal Relief and carried-forward losses can materially change the result.