PEG Ratio 2025: How Australian Investors Are Using It to Value Shares

When it comes to picking winning stocks, savvy Australian investors know that looking at just the price-to-earnings (P/E) ratio doesn’t cut it anymore. In 2025, as the ASX navigates a landscape shaped by persistent inflation, rising tech disruption, and fresh regulatory changes, the Price/Earnings-to-Growth (PEG) ratio is emerging as the sharper tool for evaluating whether a share is truly undervalued—or just cheap for a reason.

Why the PEG Ratio Matters More Than Ever

The PEG ratio takes the classic P/E and adjusts it for a company’s expected earnings growth. In simple terms, it tells you how much you’re paying for each percentage point of future earnings growth. The formula is:

• PEG Ratio = (P/E Ratio) / Annual EPS Growth (%)

This extra layer of insight is critical in 2025, as many ASX-listed companies are reporting strong earnings rebounds post-pandemic, but not all are growing at the same pace. For example, a tech stock with a P/E of 30 might look expensive, but if it’s growing earnings at 40% a year, its PEG is just 0.75—a potential bargain compared to a slow-growth utility with a P/E of 15 and 3% growth (PEG = 5).

How 2025 Policy Changes Are Shaping Growth Expectations

Australian investors in 2025 are facing a unique mix of macroeconomic and regulatory developments:

• APRA’s updated prudential standards are prompting banks to hold more capital, likely dampening their near-term earnings growth compared to the fintech upstarts.

• Federal tax incentives for renewable energy and tech R&D are turbocharging certain sectors, leading to double-digit EPS growth projections for solar, green hydrogen, and AI-driven companies.

• Persistent inflation and a slower-than-expected RBA rate-cutting cycle are squeezing margins in consumer staples, but boosting pricing power for select commodities and miners.

All of this means the old habit of chasing low P/E stocks can lead investors into value traps, while ignoring high P/E stocks with rapid growth may mean missing the next Afterpay or Wisetech Global.

PEG in Action: Real-World Examples on the ASX

Let’s look at how PEG separates the wheat from the chaff among ASX leaders in 2025:

• CSL Limited (CSL): With a P/E of 36 and consensus EPS growth of 18%, CSL’s PEG sits at 2.0—suggesting it’s not cheap, but not outrageously priced for its robust pipeline.

• Pilbara Minerals (PLS): Trading at a P/E of 12 but with projected EPS growth of just 5% (due to soft lithium prices), its PEG is 2.4—actually pricier than the headline P/E suggests.

• Xero (XRO): A P/E of 90 looks nosebleed-high, but with 40% expected earnings growth, PEG = 2.25. Still rich, but less so than the P/E alone implies, especially if global expansion accelerates.

In contrast, some ASX200 retailers have P/Es under 15 but shrinking earnings, pushing their PEG ratios above 3—an alarm bell for value investors.

How to Use PEG Wisely in 2025

• Compare within sectors: PEG is most useful when comparing companies in the same industry, as growth rates and capital intensity vary widely.

• Scrutinise the growth estimate: The ‘G’ in PEG is based on consensus analyst forecasts, which can swing wildly. Always check the assumptions behind those numbers.

• Look for PEG < 1 for bargains: A PEG under 1 often signals undervaluation, but only if the growth is sustainable and not a one-off spike.

• Balance with quality metrics: Combine PEG with debt levels, cash flow, and return on equity for a full picture—especially as rate volatility continues in 2025.

The Bottom Line: PEG Ratio Is a Must-Have Tool for 2025

The PEG ratio isn’t a silver bullet, but it gives Australians a sharper lens on value than the old P/E shortcut. With economic conditions and company fortunes diverging rapidly in 2025, smart investors are using PEG to cut through the noise and spot genuine growth at a fair price. Whether you’re scanning for blue-chip bargains or the next breakout tech star, PEG helps you avoid the most common traps—and seize the best opportunities.