Should I Sell My ASX Shares Before July 2027? What the New CGT Rules Really Mean

ASX Investors Face New CGT Rules in 2027

From 1 July 2027, Australia’s 50% capital gains tax discount disappears for good. In its place comes a system based on inflation indexation, plus a 30% minimum tax rate on real gains. For ASX investors sitting on profitable positions, this raises a question worth thinking through carefully: sell now and lock in the discount, or hold and bet the new system treats you better?

There is no single right answer. But there is a clear way to work it out, and most investors have not yet run the numbers on their own holdings.

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The New CGT Rules Explained

Following the 2026-27 Federal Budget handed down this week, the Government has confirmed the biggest overhaul of capital gains tax in more than 25 years. The 50% discount has been in place since 1999. If you held a share for more than 12 months, you only paid tax on half the gain. That ends on 1 July 2027.

The replacement system has two parts. First, your cost base gets indexed for inflation, so you only pay tax on the real gain above inflation. Second, a 30% minimum tax rate applies to that real gain, regardless of your marginal tax bracket. Age Pensioners and income support recipients are exempt from the 30% floor and continue to pay at their marginal rate.

Importantly, shares you already own get a transitional treatment. The growth that built up before 1 July 2027 still qualifies for the 50% discount. Only the growth from that date forward falls under the new indexation and 30% rules. To handle the transition, the ATO will let investors either use the market value of their shares on 1 July 2027 to reset their cost base, or apply a simplified apportionment formula based on the share’s growth over the holding period. This makes the decision more nuanced than a simple “sell now or sell later” choice.

Long-term holders of pre-1985 ASX shares face an even bigger change: their previously permanent CGT exemption ends from 1 July 2027 too. For everyone else, the question is whether to sell now or hold through the transition. In our view, this is not a tweak. It is the biggest CGT change since the discount was introduced, and it will reshape how Australians think about long-term investing.

When Selling Before 2027 Makes Sense

The maths favours selling before 30 June 2027 in three situations.

The first is high-growth ASX shares delivering real returns above roughly 5% per year. Treasury’s own modelling shows that at these growth rates, the new indexation method produces less of a discount than the existing 50% rule, so locking in the 50% discount usually wins.

The second is investors on the top marginal tax rate of 47%. Combining the 50% discount with a high tax bracket produces a much lower effective rate than the new 30% floor, which kicks in regardless of how you structure your income.

The third is investors who would have sold within the next two to three years anyway. Bringing the sale forward to capture the 50% discount on the full gain is, in our view, almost always cheaper than waiting and paying tax under the new rules on the post-2027 portion.

When Holding Through 2027 Wins

Selling is not always the right move. Holding makes more sense in three cases.

If your shares track inflation closely with modest real growth below about 2.5% per year, indexation can wipe out most or all of your taxable gain on the post-2027 portion. Long-held dividend stocks and slow-growing industrials often fall into this group.

If you are a retiree on the Age Pension, the 30% floor does not apply to you. Your gains continue to be taxed at marginal rates, which could be very low.

And if selling now would crystallise a massive immediate tax bill, the answer is not always to take that hit. Remember, your pre-2027 growth keeps the 50% discount even if you hold past the deadline. Sometimes deferring through indexation costs less over time, especially for assets with low expected real growth.

Our view: forced selling to “beat the deadline” is one of the most expensive mistakes investors make under tax reform. Run the numbers on each holding separately.

The Investor’s Takeaway

The right answer depends on three variables: how fast your share is growing in real terms, your marginal tax rate, and how soon you would have sold anyway.

High-growth winners on high marginal rates lean toward selling before 30 June 2027. Slow-growth income holdings, pensioner-held portfolios, and shares with large embedded gains often lean toward holding and benefiting from the transitional treatment.

The 14-month window is enough time to plan, not panic. The change is announced but not yet law, so some detail will shift during consultation. Even so, this is the rare tax decision where the maths matters more than the gut feel, and every ASX investor with a meaningful portfolio should be doing the numbers now rather than next June.