CGT Impact Calculator | Sonas Wealth

CGT Impact Calculator

Estimate how the CGT reforms under the Treasury Laws Amendment (Tax Reform No. 1) Act 2026 — replacing the 50% CGT discount with cost-base indexation and a 30% minimum tax rate from 1 July 2027 — could affect the after-tax proceeds from selling an asset.

Your Investment

Type of asset

Date purchased

Estimated sale date

Purchase price ($)

Expected sale price ($)

Purchase costs / brokerage and transaction costs ($)

Selling costs / brokerage and transaction costs ($)

Your Tax Situation

Your income (before this sale)

Capital losses available ($)

Your share of this investment (%)

Include Medicare levy?

Adds 2% to each marginal rate shown above.

Assumptions

Valuation method

Annual inflation rate: 2.5%

Key Results

Difference in after-tax proceeds

After-tax return p.a. — current rules

0.0%

After-tax return p.a. — new rules

0.0%

Return impact

0.0 pp

Current rules vs new rules

Current rules (50% discount)

Taxable gain $0

Estimated tax payable $0

Amount kept after tax $0

New rules (indexation + 30% floor)

Taxable gain $0

Estimated tax payable $0

Amount kept after tax $0

Gain summary

Capital gain before tax (net of costs & losses) $0

Holding period –

12-month discount test –

Pre-transition portion (before 1 Jul 2027)

Portion of gain $0

Taxable amount (after discount if eligible) $0

Post-transition portion (from 1 Jul 2027)

Portion of gain (nominal) $0

Inflation adjustment applied $0

Taxable amount (real, after indexation) $0

Tax comparison

Tax payable — current rules $0

Tax payable — new rules $0

Inflation sensitivity

Inflation	Kept after tax (new rules)	Difference vs current rules

Important: This calculator provides estimates only and general information — it is not financial, tax or legal advice and does not take into account your personal objectives, financial situation or needs. It does not account for multiple parcels of the same investment, loss-offsetting rules across other assets, the main residence exemption, small business CGT concessions, company or trust structures, negative gearing, rental income, depreciation, carried-forward losses, employee share scheme rules, or foreign tax offsets. Actual outcomes may differ materially from these estimates depending on final ATO guidance. Please speak with your financial adviser before making a decision based on these figures.