How To Read an Income Statement: The 7 Questions Investors Need to Ask

Do you read you company’s income statement? And for the record, we don’t believe that simply looking at the company’s media release or presentation with the revenue and EBITDA/profit figures count as reading the income statement. You need to dig into them. And not just have a quick glance at the raw figures and compare them to last year, but think harder.

After all, the income statement is the part of the financials most vulnerable to accounting judgement. The challenge is learning to read it critically — as a narrative about how the business actually works.

7 Questions Investors Need to Ask When Reading an Income Statement

1. Is revenue growing for the right reasons?

The first question is deceptively simple: is revenue growing, and why? Investors often celebrate top‑line growth without interrogating its drivers. Yet revenue can grow for reasons that are either constructive or fragile. Constructive growth comes from volume expansion, pricing power, mix improvement, or new products. Fragile growth comes from acquisitions, aggressive discounting, or temporary demand spikes. Ask companies like Sonic Healthcare (ASX:SHL) that saw huge revenue booms during the pandemic from selling COVID test kits – that was never going to last forever.

That is an extreme example but to come back to a reality more common for investors to face. The question to ask is whether revenues are growing because the company is selling more of what it sells at the same price or is it selling goods at a higher price.

Investors should also ask whether revenue growth aligns with the business model. A software company should grow through subscriptions; a retailer should grow through throughput; a miner should grow through production. When revenue grows for reasons inconsistent with the model, the economics may be deteriorating. The income statement reveals the headline; the context reveals the truth.

2. Are gross margins stable, rising, or deteriorating?

In our view, gross margin (i.e. the money left after deducting cost of goods sold from revenues but before other expenses are deducted) is the most important line in the income statement after revenue. Yes, even more than the bottom line. Why? Because it reveals whether the business has pricing power, cost discipline, and operational leverage. A business with rising revenue but falling gross margin is not improving; it is stretching. A business with stable revenue but rising gross margin is improving; it is becoming more efficient.

Investors should ask why gross margin moved. Rising gross margin may reflect improved pricing, better procurement, automation, or mix shift toward higher‑margin products. Falling gross margin may reflect input inflation, discounting, supply chain issues, or competitive pressure. The income statement shows the number; the economics explain the movement.

The rhythm is important too. After all, a business with gross margin oscillating between 40–60% is unstable but a business with gross margin rising steadily from 45% to 55% is strengthening. Gross margin is the earliest indicator of competitive dynamics. It moves before NPAT does. It reveals whether the business is gaining or losing ground.

3. Are operating expenses scaling with discipline?

Operating expenses (R&D, sales and marketing, and general and administrative) reveal how management allocates resources. Investors often treat Opex as a cost centre, yet Opex is also an investment centre. R&D builds future products; sales and marketing build future revenue; G&A builds organisational capacity. The question is not whether Opex is rising, but whether it is rising for the right reasons.

Investors should ask whether Opex is scaling efficiently. A business with revenue rising 20% and Opex rising 40% is losing operating leverage. A business with revenue rising 20% and Opex rising 10% is gaining operating leverage. Rising R&D may reflect innovation; rising sales and marketing may reflect customer acquisition; rising G&A may reflect inefficiency. A business that invests heavily in R&D but keeps G&A stable is usually disciplined. A business that expands G&A faster than revenue is usually not.

Operating leverage is one of the most powerful drivers of long‑term profitability. The income statement shows whether the business is building it or eroding it.

4. Is EBITDA telling the truth or hiding the truth?

EBITDA is one of the most widely used metrics in finance, yet it is also one of the most misunderstood. Investors often treat EBITDA as a proxy for cash flow, yet EBITDA excludes depreciation, amortisation, interest, and tax — all of which are expenses even if not all are cash (although some are). EBITDA can hide capital intensity, mask debt burden, and obscure tax exposure.

Investors should ask whether EBITDA aligns with the business model. A software company with high EBITDA margins is expected; a mining company with high EBITDA margins may be masking capital intensity. A retailer with rising EBITDA but falling gross margin may be discounting aggressively. A telco with rising EBITDA but rising depreciation may be consuming capital.

The relationship between EBITDA and NPAT is important to observe. A business with A$200m EBITDA and A$180m NPAT is capital‑light. A business with A$200m EBITDA and A$20m NPAT is capital‑intensive. The income statement reveals whether EBITDA is a useful metric or a misleading one.

EBITDA is not inherently good or bad. It is only useful when interpreted in context. The income statement provides that context.

5. Are depreciation and amortisation telling you something management isn’t?

Again, depreciation and amortisation are often dismissed as non‑cash items, yet they reveal the capital intensity of the business. A business with rising depreciation is investing heavily in physical assets; a business with rising amortisation is investing heavily in intangible assets. The income statement shows these movements clearly.

Investors should ask whether depreciation and amortisation align with capex. A business with A$100m depreciation and A$50m capex is under‑investing. A business with A$100m depreciation and A$150m capex is expanding. The relationship reveals whether the business is sustaining itself or stretching itself.

Amortisation also reveals a company’s acquisition strategy. Rising amortisation may reflect increased acquisition activity. Investors should ask whether acquisitions are creating value or consuming it. The income statement shows the amortisation; the cash flow statement shows the acquisitions. Let’s take a minute to look at amortisation for software firms. Some amortisation is unavoidable but the question is whether or not the business is investing enough to remain ‘up to date’.

The bottom line is that depreciation and amortisation reveal whether the business is capital‑light or capital‑intensive, acquisitive or organic, disciplined or opportunistic.

6. Are interest and tax revealing hidden risks?

Interest and tax are often treated as mechanical items, yet they reveal structural risks. Rising interest expense may reflect rising debt, rising rates, or deteriorating credit quality. Rising tax expense may reflect reduced tax shields, increased profitability, or changes in jurisdictional mix.

Investors should ask whether interest expense aligns with the balance sheet. A business with stable debt but rising interest expense may be facing higher rates. A business with rising debt but stable interest expense may be refinancing favourably. The income statement reveals the cost of capital; the balance sheet reveals the structure of capital.

Tax also reveals strategic positioning. A business with a stable effective tax rate is predictable; a business with a volatile effective tax rate is exposed. Changes in tax rate may reflect geographic expansion, regulatory changes, or shifts in profitability. The income statement shows the tax burden; the notes show the drivers.

7. Does NPAT reflect economic reality or accounting reality?

The final question is the most important: does NPAT reflect the underlying economics of the business? NPAT is the most curated number in the income statement. It is shaped by revenue recognition, cost allocation, capitalisation policies, depreciation schedules, amortisation assumptions, and non‑cash adjustments. Investors should treat NPAT as a starting point, not an endpoint.

The question is whether NPAT aligns with cash flow. A business with rising NPAT but falling CFO is fragile. A business with rising NPAT but rising capex may be masking capital intensity. A business with rising NPAT but rising working capital may be stretching itself. The income statement shows NPAT; the cash flow statement reveals whether it is real.

Investors should also ask whether NPAT aligns with margins. A business with rising NPAT but falling gross margin may be discounting. A business with rising NPAT but rising Opex may be consuming operating leverage. The income statement reveals whether NPAT is supported or undermined by the underlying economics.

Conclusion

Everything in a business’ income statement reveals the economics beneath the accounting. They show whether a business is gaining or losing pricing power, building or eroding operating leverage, compounding or consuming capital. They show whether management is disciplined or opportunistic, and they show whether the business is real.