Some say volatility, rather than debt, is the best way to think about risk as an investor, but Warren Buffett famously said that 'Volatility is far from synonymous with risk.' So it might be obvious that you need to consider debt, when you think about how risky any given stock is, because too much debt can sink a company. As with many other companies Corning Incorporated (NYSE:GLW) makes use of debt. But should shareholders be worried about its use of debt?

When Is Debt A Problem?

Generally speaking, debt only becomes a real problem when a company can't easily pay it off, either by raising capital or with its own cash flow. If things get really bad, the lenders can take control of the business. However, a more usual (but still expensive) situation is where a company must dilute shareholders at a cheap share price simply to get debt under control. By replacing dilution, though, debt can be an extremely good tool for businesses that need capital to invest in growth at high rates of return. The first step when considering a company's debt levels is to consider its cash and debt together.

What Is Corning's Net Debt?

You can click the graphic below for the historical numbers, but it shows that as of March 2024 Corning had US$7.37b of debt, an increase on US$6.85b, over one year. However, it also had US$1.37b in cash, and so its net debt is US$6.00b.

How Healthy Is Corning's Balance Sheet?

We can see from the most recent balance sheet that Corning had liabilities of US$4.18b falling due within a year, and liabilities of US$11.9b due beyond that. Offsetting these obligations, it had cash of US$1.37b as well as receivables valued at US$1.62b due within 12 months. So its liabilities outweigh the sum of its cash and (near-term) receivables by US$13.1b.

While this might seem like a lot, it is not so bad since Corning has a huge market capitalization of US$38.3b, and so it could probably strengthen its balance sheet by raising capital if it needed to. However, it is still worthwhile taking a close look at its ability to pay off debt.

We measure a company's debt load relative to its earnings power by looking at its net debt divided by its earnings before interest, tax, depreciation, and amortization (EBITDA) and by calculating how easily its earnings before interest and tax (EBIT) cover its interest expense (interest cover). The advantage of this approach is that we take into account both the absolute quantum of debt (with net debt to EBITDA) and the actual interest expenses associated with that debt (with its interest cover ratio).

Corning has net debt worth 2.3 times EBITDA, which isn't too much, but its interest cover looks a bit on the low side, with EBIT at only 4.4 times the interest expense. It seems that the business incurs large depreciation and amortisation charges, so maybe its debt load is heavier than it would first appear, since EBITDA is arguably a generous measure of earnings. Shareholders should be aware that Corning's EBIT was down 20% last year. If that earnings trend continues then paying off its debt will be about as easy as herding cats on to a roller coaster. When analysing debt levels, the balance sheet is the obvious place to start. But it is future earnings, more than anything, that will determine Corning's ability to maintain a healthy balance sheet going forward. So if you're focused on the future you can check out this free report showing analyst profit forecasts.

Finally, a business needs free cash flow to pay off debt; accounting profits just don't cut it. So it's worth checking how much of that EBIT is backed by free cash flow. Over the most recent three years, Corning recorded free cash flow worth 54% of its EBIT, which is around normal, given free cash flow excludes interest and tax. This cold hard cash means it can reduce its debt when it wants to.

Our View

Corning's EBIT growth rate was a real negative on this analysis, although the other factors we considered cast it in a significantly better light. For example, its conversion of EBIT to free cash flow is relatively strong. When we consider all the factors discussed, it seems to us that Corning is taking some risks with its use of debt. While that debt can boost returns, we think the company has enough leverage now. When analysing debt levels, the balance sheet is the obvious place to start. However, not all investment risk resides within the balance sheet - far from it. Case in point: We've spotted 4 warning signs for Corning you should be aware of, and 1 of them is potentially serious.

At the end of the day, it's often better to focus on companies that are free from net debt. You can access our special list of such companies (all with a track record of profit growth). It's free.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team@simplywallst.com