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UK Capital Gains Tax Scenario Calculator — result sheet
Estimate UK-style capital gains tax by applying entered losses, annual exempt amount, unused basic-rate band, and two entered gain rates.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Net gain = max(0, gross gain − allowable losses); taxable gain = max(0, net gain − annual exempt amount); gain at basic rate = min(taxable gain, max(0, basic-rate band − taxable income)); gain at higher rate = taxable gain − gain at basic rate; estimated tax = basic-rate gain × basic rate + higher-rate gain × higher rate.
This calculator turns the structure described by HMRC into an editable planning scenario. Rates, allowances, reliefs, and the treatment of gains differ by tax year and asset, so every jurisdictional parameter is exposed rather than hidden in an unchangeable formula.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Gross chargeable gain — currency units; minimum 0; maximum 1000000000000000
- Allowable losses used — currency units; minimum 0; maximum 1000000000000000
- Annual exempt amount — currency units; minimum 0; maximum 1000000000000000
- Taxable income before gains — currency units; minimum 0; maximum 1000000000000000
- Basic-rate band remaining before gains — currency units; minimum 0; maximum 1000000000000000
- Basic CGT rate — %; minimum 0; maximum 100
- Higher CGT rate — %; minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Gross chargeable gain | 20000 |
| Allowable losses used | 0 |
| Annual exempt amount | 3000 |
| Taxable income before gains | 20000 |
| Basic-rate band remaining before gains | 37700 |
| Basic CGT rate | 18 |
| Higher CGT rate | 24 |
The taxable gain is 17,000; 17,700 of basic band remains, so the full gain is modelled at 18% and the estimated tax is 3,060.
Assumptions and limits
- The entered gross gain is chargeable under the visitor’s chosen scenario.
- Entered losses are applied against the gain before the annual exempt amount.
- The annual exempt amount is entered for the relevant tax year and taxpayer type.
- Taxable income is entered in the same tax-year and currency context as the band.
- The basic-rate band input is the portion available to gains before the gain is added.
- Two entered rates are used for a simple split between the unused basic band and the remainder.
- Residential property, carried interest, business reliefs, trusts, and special regimes are not inferred.
- The calculator does not determine residence, filing status, or whether an asset is chargeable.
- Transaction costs, pooling rules, valuations, and record-keeping adjustments are outside the arithmetic.
- HMRC guidance and the current tax year must be checked before a return or payment decision.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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