How is CGT calculated in this calculator?
It calculates cost base, works out your capital gain, applies losses first, then applies the 50% discount when eligible. The net gain is added to income to estimate extra tax.
Estimate your CGT from sale price, costs, losses, and holding period.
Source values reviewed on 21 February 2026.
50% CGT discount applied after capital losses, based on 12+ month holding period.
| Step | Method |
|---|---|
| 1 | Work out cost base (purchase price + eligible costs) |
| 2 | Gross gain = sale price - cost base |
| 3 | Apply capital losses first |
| 4 | Apply 50% CGT discount if held for 12+ months and eligible |
| 5 | Add net capital gain to taxable income and estimate extra tax |
It calculates cost base, works out your capital gain, applies losses first, then applies the 50% discount when eligible. The net gain is added to income to estimate extra tax.
For eligible assets held for at least 12 months by individuals and trusts. This calculator applies the discount based on your holding period input.
No. It is a strong estimate for common individual scenarios. Special rules, exemptions and asset-specific treatment can change final tax.