The 12 May 2026 Federal Budget may end up changing not just how much tax investors pay, but how they behave in the sharemarket.

For decades, Australia’s capital gains tax system has encouraged a relatively simple strategy: buy quality assets, hold them for more than 12 months, and receive the 50% CGT discount when eventually selling. That framework has rewarded patience, long-term investing and low portfolio turnover.

The proposed changes announced in the Budget could alter those incentives significantly.

Under the new proposal, the existing flat 50% CGT discount would gradually be replaced with an inflation-indexed system from July 2027, alongside a proposed minimum tax rate on capital gains. Instead of receiving an automatic 50% reduction after one year, investors would only be taxed on gains above inflation.

The result is a meaningful shift in investor psychology.

The 12-Month Incentive Weakens

One of the most important behavioural effects of the current system is the “12-month hurdle”. Investors are often reluctant to sell before crossing the one-year threshold because the tax penalty can be substantial.

That dynamic has historically encouraged investors to:

• hold shares longer,
• avoid excessive trading,
• and focus more on long-term capital appreciation.

If the flat discount disappears, that cliff effect becomes far less important. Investors may become more willing to sell positions based on market conditions, valuation or portfolio rebalancing rather than simply waiting for a tax benefit to kick in.

For active investors and traders, the distinction between holding for 11 months or 13 months may no longer matter nearly as much.

Could Investors Trade More Frequently?

Potentially yes — particularly among tactical investors.

Without the strong tax incentive to hold for longer than a year, some investors may become more active:

• taking profits earlier,
• rotating between sectors more often,
• and responding faster to market opportunities.

Momentum strategies and shorter-term positioning could become relatively more attractive because the tax advantage of extended holding periods diminishes.

However, the effect is unlikely to be uniform across the market.

The “Lock-In Effect” Could Also Increase

Higher effective taxation on gains can also discourage selling altogether.

Investors sitting on large unrealised gains may choose to defer selling for longer periods in order to avoid crystallising a larger tax liability. Economists refer to this as the “lock-in effect”.

This is particularly relevant for:

• long-term holders of blue-chip shares,
• founders and business owners,
• and investors with large embedded gains accumulated over many years.

In practice, this means the market could see two opposing forces at work:

• shorter-term investors trading more actively,
• while long-term investors become even more reluctant to sell.

Greater Focus on Income and Tax Efficiency

The changes may also shift investor preferences away from pure capital growth strategies and toward income-producing assets.

Australian investors already place significant emphasis on:

• franked dividends,
• income stability,
• and tax-efficient structures such as superannuation.

If capital gains become less tax-advantaged, dividend-paying companies may become even more attractive on a relative basis.

This could favour:

• banks,
• infrastructure,
• utilities,
• REITs,
• and mature industrial companies with reliable distributions.

At the same time, speculative growth investing may become somewhat less attractive on an after-tax basis.

A Shift Away from Tax-Driven Investing

One of the broader implications of the Budget is that investment decisions may become less driven by tax rules and more driven by underlying fundamentals.

Under the old framework, many investors structured decisions around:

• maximising the CGT discount,
• timing disposals around the 12-month threshold,
• or prioritising tax outcomes over valuation.

The proposed changes reduce the importance of that strategy.

Instead, investors may increasingly focus on:

• real returns after inflation,
• quality of earnings,
• balance sheet strength,
• and sustainable cash flow generation.

The Bigger Picture

The overall impact on market turnover remains uncertain. Some parts of the market may become more active, while others may become more tightly held.

But the larger change is philosophical.

Australia’s existing CGT system has strongly rewarded long-duration capital appreciation. Last night’s Budget begins shifting the focus toward inflation-adjusted real returns rather than nominal gains alone.

For share investors, that could reshape portfolio construction, trading behaviour and investment strategy for years to come.

Lauren Hua is a private client adviser at Fairmont Equities.

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