Australia's capital gains tax rules are changing from 1 July 2027, and for owners of private businesses, 30 June 2027 could become an important valuation date. The changes are now law. The reforms passed both Houses of Parliament and received royal assent in June 2026 (Treasury Laws Amendment (Tax Reform No. 1) Act 2026 and the related Income Tax Rates Amendment Act). From 1 July 2027, the existing 50% CGT discount will generally be replaced with cost base indexation, togethe