cgtcalc: UK capital gains tax calculator
Run a capital gains calculation from your transaction input, then inspect a drill-down of the matching and gain/loss math.
Disclaimer: I am not a financial professional and cannot give tax advice. This calculator is intended for sample purposes only. Always do your own calculations for your self assessment. I accept no responsibility for any errors this calculator produces.
- This uses the cgtcalc Swift project to perform calculations. You can also run that project directly.
- No data entered into this website is logged or stored on the server.
For supported input rows and exact field formats, use the cgtcalc input format documentation. Input parsing is strict (for example, exact field counts and zero-padded YYYY-MM-DD dates).
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Output
Interactive Report
Tax Year Summary
Showing all tax years
| Tax Year | Disposals | Proceeds | Total Gain | Total Loss | Net Gain/Loss | Taxable Gain |
|---|
Disposal Explorer
| Date | Tax Year | Asset | Proceeds | Gain/Loss | Matches |
|---|
Calculation Drill In
Select a disposal row to view a detailed cost breakdown.
Holdings
| Asset | Quantity | Cost Basis | Average Cost |
|---|
Spouse Transfers Out
| Date | Asset | Quantity | Transferred Cost Basis | Average Cost |
|---|