Work out indexed cost of acquisition instantly with clear inputs, formula shown and shareable results.
Indexation restates the original cost in current money using the official cost inflation index, so only the real gain is taxed. The uplift is the purchase cost multiplied by the ratio of the sale-year index to the purchase-year index.
Indexed cost
Indexed cost = cost × (index in sale year / index in purchase year)
Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.
Typically long-term holdings of property, unlisted shares and certain debt instruments — rules vary and have been narrowing.
Each improvement is indexed separately from the year it was incurred.