Reintroduced indexation · Federal Budget update
Enter your asset details and we apply the reintroduced indexation method — uplifting your cost base by the ABS Consumer Price Index — then compare it against the 50% CGT discount and your marginal income tax to show the real capital gains tax payable on disposal.
Add every asset you've sold this tax year. Each one rolls into the portfolio total on the right.
Add an asset class to your calculation
1 asset currently included.
FIFO matches units sold against oldest parcels first.
Sold another asset? Add it to the total.
CGT is added to your other taxable income in the tax year you sell. Enter what you earned (or expect to earn) in the relevant tax year — the financial year of your latest sale date.
Calculating for a future sale? Use your hypothetical income for that year (e.g. expected salary, business profit, rental income). The calculator uses 2024-25 marginal brackets as a stable proxy until future brackets are legislated.
Pre-1 Jul 2027 gains: choose discount or indexation (or auto). Post-1 Jul 2027 gains are always indexation-only with a 30% minimum tax floor.
No matched parcels.
Capital losses on any asset offset gains across the portfolio before the discount/indexation step. FIFO is applied within each share/ETF holding. Lines tagged post-2027 use 1 Jul 2027 market value as their new cost base and are indexed by CPI from that date; a 30% minimum tax is applied to the post-2027 slice if your marginal rate would otherwise be lower.
FAQ
The indexation method uplifts the cost base of a CGT asset by the movement in the ABS Consumer Price Index between the quarter of acquisition and the quarter of disposal. Only the gain above the indexed cost base is taxed. It has been reintroduced for assets held over 12 months under the latest federal budget.
Multiply your original cost base (purchase price plus acquisition and disposal costs) by the CPI ratio (CPI at disposal quarter divided by CPI at acquisition quarter). Subtract the indexed cost base from the sale proceeds. The result is the indexed capital gain, which is added to your taxable income at your marginal rate.
The ATO lets you choose whichever produces the lower tax. The 50% CGT discount usually wins when inflation has been low or the asset has appreciated a lot. Indexation tends to win for long-held assets in higher-inflation periods. This calculator runs both methods and shows you the cheaper one automatically.
Yes. Australian resident individuals can still apply the 50% CGT discount on assets held longer than 12 months, but you cannot combine it with indexation on the same asset. You pick the method that gives the lower assessable gain.
Net capital gains are added to your assessable income and taxed at your marginal income tax rate. This calculator applies the FY 2024–25 resident brackets after working out the gain using FIFO parcel matching, so you see the actual extra tax payable on disposal.
Calculations use the legislated CPI series (ABS 6401.0, weighted average of eight capital cities) and ATO marginal rates. It is accurate for standard share, ETF and investment-property disposals but does not model the main-residence exemption, prior-year losses, Medicare levy surcharge, or non-resident status. Always confirm with a registered tax agent before lodging.