Federal Budget 2026: Should You Sell ASX Shares Before Tuesday Night’s CGT Changes?

Federal Budget 2026 CGT Changes for ASX Investors

The Federal Budget drops at 7:30 pm on Tuesday, 12 May. And one question is on every long-term ASX investor’s mind this weekend: should you sell some shares before Treasurer Jim Chalmers stands up to speak? The 50% capital gains tax discount has been part of the system since 1999, and it cuts your tax bill in half when you sell shares you have held for more than a year. Treasury has been actively modelling 33% and 25% scenarios, and a Senate inquiry on the discount called for reform in March. Recent reporting suggests the changes may apply to shares, not just property.

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What Could Actually Change on Tuesday Night

Two main options are on the table.

The first is a straight cut to the discount, from 50% down to 33% or even 25%. Simple, but more painful at tax time.

The second, which is the leading idea, is to bring back the pre-1999 system. Under that model, you only pay tax on the part of your profit that beats inflation. So if your shares went up 50% over five years but inflation was 20%, you would only pay tax on the 30% that was real growth.

Historical precedent points to existing gains being protected. When CGT was introduced in 1985, all assets held before that date were grandfathered and remain tax-free today. Recent reports suggest something similar this time: keep the 50% discount on gains built up under current rules, and apply the new rules only to growth from here on.

Which ASX Investors Should Be Most Worried

This is not a market-wide problem. Some investors are far more exposed than others.

If you are sitting on big paper profits in stocks like DroneShield (ASX:DRO), Northern Star (ASX:NST) or Lynas (ASX:LYC), this is the conversation you should be having this weekend. Years of growth mean a large dollar gain, and indexation often takes more from you than the 50% discount does.

If you are a dividend investor who rarely sells, you are mostly safe. If you have only just bought shares, your gains are small so far and unlikely to be hit by the change.

The Investor’s Takeaway: Sell or Hold?

For most readers, we believe selling in a hurry on Monday is the wrong move. If gains made before Tuesday night are protected, the rush disappears. Selling a good business just to dodge tax usually costs more in missed future returns than the tax you save.

That said, the budget is a good moment to clean up. If you have been meaning to sell a stock for months and just keep putting it off, this weekend is the time to do it. One practical note: for ASX shares, the CGT event triggers on the trade date, not the settlement date two business days later. A Monday sale locks in today’s rules even if the cash clears on Wednesday after the budget.

What to watch on Tuesday night: how existing gains are treated, whether the start date is budget night or 1 July, and whether indexation is officially the chosen path.