ATO Compliant

CGT Index Cost Base Calculator

Capital Gains Tax · Australian Taxation Office · Historical CPI Data

Discount / Indexation Method

Assets acquired on or after 21 Sept 1999 may use the 50% discount if held >12 months. Both methods are compared automatically below.

— Acquisition Details

Asset Name / Description

Asset Type

Purchase Date

Disposal Date

Purchase Price (Total)

Disposal Proceeds

— Incidental Costs (included in cost base)

Description

Amount

— Taxpayer Details

Marginal Tax Rate

Medicare Levy

Capital Gain Analysis

Gross Proceeds

—

Indexed Cost Base

—

Capital Gain (Gross)

—

Taxable Gain (After Concession)
—

Est. CGT Payable

—

Effective CGT Rate

—

Indexed Cost Base Breakdown

Component

Original $

CPI Factor

Indexed $

Method Comparison — Best Outcome

Method

Taxable Gain

CGT Payable

Saving

Tax Calculation Detail

▸ Show ATO CPI Indexation Reference Table

⚠ This calculator is for illustrative purposes only and does not constitute tax advice. CPI indexation figures are based on ATO published quarterly CPI data (September quarter). The indexation method is only available for assets acquired before 11:45am AEST on 21 September 1999, and is frozen at the September 1999 CPI index number (68.7). Always consult a registered tax agent or the ATO for your specific circumstances.