Free calculator — deadline 30 June 2027
CGT Calculator 2027
Compare your capital gains tax under old rules (sell before 1 July 2027) vs new rules (sell after). See the exact dollar difference for your asset.
Sell before Jul 2027
Old 50% discount rules
$16,350
tax payable
You keep $183,650
Sell after Jul 2027
New indexation + 30% floor
$15,900
tax payable
You keep $184,100
After-2027 rules breakdown
New rules are similar for this asset
The CPI indexation method is competitive for assets purchased recently. The timing difference is minimal here.
Estimates only — not financial or tax advice. Consult a registered tax agent for your situation.
The 2027 CGT rules don't add tax in your situation
See how CGT fits your full investment and wealth plan over 20 years.
See my full plan →What changes on 1 July 2027?
The 50% CGT discount — which has been in place since 1999 — is being replaced from 1 July 2027. Under the old system, if you held an asset for more than 12 months, you only paid tax on half the gain regardless of how large it was. A $500,000 gain became a $250,000 taxable amount.
Under the new system, only the inflation component is removed from the gain (via CPI indexation of your cost base). The remaining gain is fully taxable, subject to a 30% minimum tax rate. For large gains on high-growth assets, the new rules will often result in significantly more tax.
The deadline is 30 June 2027. Assets with a contract of sale signed on or before that date are assessed under the old rules even if settlement occurs after. This distinction matters — the contract date, not the settlement date, determines which rules apply.
Frequently asked questions
What CGT changes are coming in 2027?
From 1 July 2027, the 50% CGT discount for assets held more than 12 months is replaced by a new system: CPI indexation of the cost base, with a 30% tax floor on the taxable gain. Assets bought before that date use a proportional split. The last day to sell under the old 50% discount rules is 30 June 2027.
Will I pay more CGT under the new rules?
Usually yes, for assets with large gains. The 50% discount was very generous — it halved the taxable gain regardless of inflation. The new indexation method only removes the inflation component, meaning a larger proportion of the real gain is taxed. The 30% floor also applies regardless of your marginal rate.
What if I bought an asset before 2027 but sell after?
For assets that straddle the 1 July 2027 date, Treasury uses a straight-line split. The portion of the gain earned before 2027 is taxed under old rules; the portion earned after is taxed under new rules. This calculator models that split accurately.
Does the CGT change affect property?
Yes, investment properties are subject to the same CGT changes. Your principal place of residence remains exempt. Negative gearing restrictions also take effect on 1 July 2027 — new investors in established properties will no longer be able to deduct rental losses against other income.
Does the CGT change affect super?
No. Capital gains inside superannuation are taxed at 15% (10% for assets held more than 12 months) — these rates are unchanged by the 2026 budget. The new CGT rules only apply to assets held personally (outside super).