Open the ASX heat map for 2026 and the pattern jumps out: the big banks have rallied while the tech names have struggled. CBA, Westpac, and NAB are up meaningfully on the year. WiseTech, Xero, and CSL are well off their 2024 highs. This isn’t an accident — it’s exactly what a rising-rate regime does to share markets, and understanding why helps you position the rest of your portfolio sensibly. Here’s the plain-English explanation for Australian traders.
The pattern in 2026
The Reserve Bank of Australia has lifted the cash rate three times in 2026, taking it to 4.35%. That’s the third rate hike in a row and a full reversal of the easing cycle that markets had assumed was coming. Sectors haven’t responded uniformly — and the divergence between banks and tech is one of the clearest signals you’ll see this year.
The four big banks are collectively well up on the year. Telstra has held its ground. Resources have been mixed — gold miners have flown, iron ore exporters have lagged on softer Chinese demand. Tech and growth healthcare have been the clear underperformers.
Why banks benefit from higher rates
Banks make money on the spread between what they pay to borrow money and what they charge to lend it out. That spread is called the net interest margin. When the RBA lifts the cash rate, banks pass most of the increase through to mortgages and business loans within days. Deposit rates lift too, but more slowly. The lag between the two is what fattens the margin.
There’s a second factor. Banks have huge balance sheets, and large pools of customer deposits sit in transaction accounts paying close to zero interest regardless of where the cash rate sits. As the rate rises, the bank’s earnings on those “free” deposits rise too. It’s an enormous tailwind.
The catch: higher rates also mean slower loan growth and rising bad debts. Borrowers struggle, mortgage applications drop, and provisions for credit losses tick up. In a mild tightening cycle, the margin gain outweighs the volume loss. In a sharp one, the maths can flip. So far in 2026 we’re firmly in the first scenario.
Why tech and growth stocks suffer
Tech and high-growth companies are valued on earnings they’re expected to generate in the future, often years from now. The way investors translate “future earnings” into “what’s it worth today” is by discounting them back using a rate. When the discount rate rises — which it does whenever the RBA hikes — those future earnings are worth less in present-value terms.
That’s why high-P/E names get hit hardest. A stock trading at 50 times earnings is essentially priced on expectations five or ten years out. Move the discount rate up by a couple of percentage points and the present-value calculation drops meaningfully.
WiseTech and Xero are good local examples. Both have strong businesses, but both trade on high multiples that bake in years of growth. In a 4.35% cash rate environment, those multiples compress whether the underlying business is healthy or not.
The sector rotation explained
When you hear traders talk about “sector rotation,” this is what they mean. Capital flows out of one part of the market and into another, in response to a shift in the underlying economic regime. Rate cycles drive these rotations more reliably than almost any other factor.
The typical pattern when rates rise: out of growth, into value. Out of long-duration assets (tech, biotech, REITs), into short-duration ones (banks, energy, staples). Out of speculation, into income. The reverse pattern plays out when rates fall.
Australia’s market in 2026 is a textbook example. Materials are mixed because they trade on commodities and Chinese demand more than the local rate. Defensives like Woolworths and Coles tick along regardless. Gold miners benefit because gold is the classic inflation hedge.
What this means for your portfolio
Five practical takeaways.
- Check your sector tilt. If you bought heavily into tech and growth during the low-rate era, your portfolio probably has a hidden concentration to higher-duration assets. Diversifying across sectors helps even out the rate cycle.
- Banks aren’t a free lunch. The rally has happened. Forward returns depend on rates staying higher for longer and bad debts staying manageable. Both could surprise to the downside.
- Tech weakness isn’t permanent. Beaten-down growth names can deliver strongly when the rate cycle eventually turns. The challenge is timing that turn — and the RBA’s path is data-dependent.
- Defensives earn their keep. In choppy markets, supermarkets and utilities don’t lead the charge but they don’t dig holes either. They smooth the ride.
- Watch the RBA forecasts, not the rate. The cash rate is where it is. What matters is where the RBA signals it’s going. Forward guidance often moves the market more than the actual decision.
Reading the rotation in real time
Sector rotations don’t announce themselves. By the time the financial press has labelled one, capital has already moved. The ASX 200 sector indices are the cleanest way to see what’s happening — XFJ for financials, XIJ for tech, XEJ for energy, XMJ for materials. Watching the relative performance of these against the broader index is more useful than tracking individual stocks.
For traders using AI tools, sector rotation is exactly the kind of signal a well-designed platform spots faster than a human can. When the underlying relative-strength trend shifts, the AI flags it. You decide whether to act on the signal — but at least you see it as it happens, not three weeks after the broker reports.
The bigger picture for 2026
Three forces are shaping ASX sector performance in 2026: the RBA path, Chinese demand for Australian resources, and the global appetite for risk. The first explains the banks-up-tech-down pattern. The second drives materials. The third decides whether speculative growth gets a second wind.
None of these is predictable in detail. What’s reasonable is to have a portfolio that doesn’t depend on getting any one of them right. Diversification across sectors, exposure across durations, and a sensible cash buffer all help. So does a trading platform that adapts to the regime rather than fighting it.
For more on the rate environment driving this rotation, see our companion piece on the RBA at 4.35%. To learn how Impulse Cashholm’s AI engine reads market signals across sectors and timeframes, visit How It Works or the FAQ.
Market commentary reflects conditions at time of writing and may change rapidly. Trading and investing involve risk, including the possible loss of capital. Past performance is not a reliable indicator of future results. Information on this page is general in nature and does not constitute financial advice.