Tax
Estimate simplified 2026/27 CGT after the annual exempt amount and remaining basic-rate band.
Calculator currency
This rule-sensitive calculator is fixed to GBP (UK 2026/27) for United Kingdom.
FinTrex result
UK Capital Gains Estimate
Estimated Capital Gains Tax
£3,618
Taxable gain after annual exempt amount
£17,000
Annual exempt amount used
£3,000
What changes this most?
Taxable gains can use two CGT rates when taxable income leaves part of the basic-rate band unused.
Sensitivity check
A roughly 10% move in net capital gain after allowable losses changes the modeled headline result by up to £480 in this setup.
Simplified 2026/27 estimate only. Reliefs, losses from other years, residence status and asset type can change the tax.
Use the number fields, sliders, or a quick preset. You can fully clear a field while editing.
Formula
The 2026/27 annual exempt amount is deducted from net gains, then taxable gains use remaining basic-rate band at 18% and the balance at 24%.
Rule context
Reviewed against: GOV.UK Capital Gains Tax rates and allowances (verified 21 Aug 2026)
Adjust one assumption at a time to understand which inputs have the greatest effect. Compare several realistic scenarios rather than relying on a single projection.
Default assumptions are maintained by FinTrex and may not reflect current products or rates available to you. Review every input before using the estimate.
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