UK Capital Gains Tax Calculator
2026/27: £3,000 annual exempt amount, then 18% (basic-rate slice) or 24% (higher-rate slice) on most assets including residential property.
Updated May 2026, using HMRC 2026/27 rates and current ONS / gov.uk figures.
2026/27 CGT framework after the 2024 reforms:
- Annual exempt amount: £3,000 (was £6,000 in 2023/24, halved in 2024).
- Rates on most assets: 18% basic, 24% higher.
- Rates on Business Asset Disposal Relief: 14% (rising to 18% from April 2027).
The calculator stacks the gain on top of your other income to determine which band the slices fall in.
How it works. Gain − £3,000 AEA. Slice on top of income; basic-rate room at 18%, higher-rate slice at 24%. 2026/27.
Worked examples
£20,000 gain + £30,000 salary → ~£3,060 CGT (mostly basic-rate slice).
£50,000 gain + £60,000 salary → ~£11,280 CGT (all higher-rate).
£100,000 second-property gain at higher rate: £24,000 minus £720 = £23,280 CGT.
Sources:
HMRC Capital Gains Tax
· retrieved 2026-05-12.
Frequently asked questions
What about my main home?
Private Residence Relief usually exempts your main home from CGT entirely. Lettings relief, periods of absence and home offices can complicate things — speak to a qualified accountant or tax adviser.
How is CGT different from income tax?
Different rates, separate annual exempt amount, separate calculation. But the band you fall in (basic / higher) depends on your other income.
How do I report CGT on a property?
UK residential property gains must be reported and tax paid within 60 days of completion via the «UK Property Account» on gov.uk. Other gains: via self-assessment.