Treasury estimates that Australia’s capital gains tax and negative-gearing reforms will add an average A$88.4 million a year in regulatory costs. For investors, one practical challenge will be establishing what their assets were worth when the new capital gains rules began.
The change itself has been settled since the May budget. Starting in July 2027, the 50 percent discount that had been in place will be no more. Instead, sellers will subtract inflation from the gain and pay at least 30 percent on what is left, and only on the part of the gain that builds up after that date.
The 2027 valuation
The harder job lands a day earlier, on 30 June 2027. Assets held on that date are deemed to have been sold and reacquired at market value. The valuation fixes the boundary between the pre-transition gain, which keeps the 50 percent discount, and everything after it, which is indexed and exposed to the minimum rate. PwC reads the date as a valuation and planning reference point rather than a transaction deadline, and advises holders to secure defensible valuation evidence dated as close to it as practicable.
Taxpayers may instead elect an apportioning method. Treasury released a draft apportionment method in August 2026 for real property and certain assets without readily ascertainable market values. It estimates the transition value using a constant compound growth rate across the ownership period.
For listed parcels a closing price settles the question. Family company shares, unlisted interests and pre-CGT holdings are harder. A range of defensible values will usually exist for the same asset, and the choice between market value and the formula can be left until the return for the year of the actual sale is lodged. Shareholders holding pre-CGT interests in unlisted companies face a further calculation to establish whether a latent gain exists at the transition date.
When deferral stops paying
Australian investors have long chosen the year of a disposal to suit their own marginal rate, taking the gain when other income was low. The 30 percent floor is built to blunt that: the gain is assessed as the last portion of income a taxpayer receives, against the highest relevant marginal rates, which strips out much of the benefit of holding on until a cheaper tax year arrives.
The effect concentrates on holders whose wealth sits in a single appreciated position, and that is a large group. Australian households held A$1.71 trillion in shares and other equity at March 2026, against total net worth of A$19.2 trillion. MinterEllison estimates effective rates on significant gains earned over a short horizon could rise from roughly 23.5 percent to 47 percent, and expects assets to migrate into companies and superannuation, alongside a pivot toward dividend-paying stocks as income becomes relatively more attractive.
Credit against the position
Valuations make the timing awkward. Mining and banking prices have left few bargains on the local market, with BHP and Rio Tinto up about 45 percent in the year to July 2026 and Sandfire Resources up 65 percent. The ASX 20 now accounts for roughly two-thirds of ASX 200 market capitalisation, with banks looking increasingly expensive and better value sitting further down the index. Strong gains before the transition make the allocation between the old and new tax regimes especially consequential.
Financing raised against an existing equity position could become a more prevalent strategy against this backdrop. Borrowing against listed shares is not a disposal, so it raises cash without crystallising a gain or resetting a cost base.
The years in between
The Reserve Bank's March review found a little over 1 percent of variable-rate owner-occupier borrowers running a cash flow shortfall at the end of 2025, with company insolvencies stabilised near their long-run average and bank capital at 12.3 percent.
Non-bank lenders account for about 6 percent of financial system assets and private credit for less than 2 percent, and the Reserve Bank put Australian private credit at about A$50 billion outstanding in December 2025 against an industry estimate of A$224 billion under management, a spread it attributes to notable data gaps in the sector.
June 2027 asks every holder for a defensible number: a market valuation for each parcel still held on the 30th. After that, the timing option Australian shareholders have worked with for a quarter of a century is gone. Holders of concentrated, appreciated positions are left with a second question alongside what to own through 2027, which is how to fund the years in which they own it.
