Isla HendersonAustralian shares are trading within striking distance of their all-time peak this July 2026, and thousands of investors are now asking the same question: should I lock in my gains? The S&P/ASX 200 climbed to 8,872 points during the week of 20 July 2026, according to market data compiled by Trading Economics, sitting just below the record 9,198.6 it set back in February 2026. After a run like this, the temptation to sell and bank the profit is strong — but the tax bill that follows can quietly erase a chunk of that windfall.
Why the record matters for your tax return
A rising index is good news on paper, but paper gains and pocketed gains are taxed very differently. In Australia, you only trigger capital gains tax (CGT) when you actually sell an asset — this is called a "CGT event". Hold your shares and the gain stays untaxed, no matter how high the ASX 200 climbs. Sell them, and the profit is added to your assessable income for the 2025–26 financial year.
That distinction is why timing matters. An investor who bought a parcel of bank or mining shares two years ago and sells near the July peak could be looking at a substantial capital gain. Because Australia taxes that gain at your marginal rate, a large sale can push you into a higher tax bracket for the year, meaning you pay more not just on the shares but on the way the profit stacks on top of your salary.
The 12-month rule that halves your bill
The single most important detail for anyone tempted to sell during this rally is the CGT discount. If you are an Australian resident individual and you have held the shares for at least 12 months before selling, you are generally entitled to a 50% discount on the capital gain, according to the Australian Taxation Office. In plain terms, only half the profit is taxed.
Sell one day short of that 12-month mark and the discount vanishes — the entire gain is taxable. For investors who bought in during the volatility of March 2026, that anniversary may still be months away. Selling now to chase the record could cost far more in tax than waiting a few weeks would. This is exactly the kind of calculation where the date on your original contract note becomes worth real money.
Gains, losses and the art of offsetting
A near-record market also creates an opportunity that many investors overlook: pairing winners with losers. Capital losses — from shares that never recovered, or from other assets sold at a loss — can be used to offset capital gains in the same financial year. If you have an underperforming holding you have been meaning to exit, selling it in the same year as a big winner can reduce the taxable gain.
Losses that exceed your gains are not wasted either; they can be carried forward to future years. But the rules on what can offset what, and in which order, are precise. Applying the discount before or after offsetting losses changes the final number, and getting the sequence wrong is a common and expensive mistake.
When a phone call pays for itself
None of this means you should avoid selling. Rebalancing a portfolio that has become overweight in a handful of soaring stocks is often the sensible move, especially with the index sitting well above its long-term average. The point is that the decision is rarely just about the share price on the screen.
A qualified financial adviser or tax agent can model the difference between selling now and selling after the 12-month threshold, factor in your other income for the year, and identify whether staging sales across two financial years could keep you in a lower bracket. For a portfolio of any size, that advice frequently saves more than it costs. On Expert Zoom you can connect with a wealth management specialist or registered tax professional who understands the Australian CGT regime and can run the numbers on your specific holdings before you place the sell order.
What to check before you sell
Three things are worth confirming before you act on the July rally. First, the exact purchase date of each parcel of shares — the 12-month clock is unforgiving. Second, whether you hold any assets sitting at a loss that could be sold in the same year to offset the gain. Third, how a large gain interacts with your total income for 2025–26, including salary, rental income and any other investments.
The ASX 200 may push back toward its February record in the months ahead, or it may not — no one can reliably predict the next move. What you can control is how much of any gain you actually keep. For most Australian investors, the smartest response to a record-breaking market is not to react to the headline number, but to understand the tax consequences of every sale first.
This article is general information only and does not constitute financial or tax advice. Your circumstances are unique — consult a licensed financial adviser or registered tax agent before making investment decisions. Full guidance on capital gains tax is available from the Australian Taxation Office.
For related reading, see our analysis of Dow Jones and ASX 200 volatility for Australian investors and Australia's real estate market in 2026.
