The external fund manager backed by Berkshire Hathaway's Charlie Munger, Li Lu, makes no bones about it when he says 'The biggest investment risk is not the volatility of prices, but whether you will suffer a permanent loss of capital.' 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 Harmonic Inc. (NASDAQ:HLIT) makes use of debt. But the real question is whether this debt is making the company risky.

When Is Debt Dangerous?

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. In the worst case scenario, a company can go bankrupt if it cannot pay its creditors. While that is not too common, we often do see indebted companies permanently diluting shareholders because lenders force them to raise capital at a distressed price. Of course, debt can be an important tool in businesses, particularly capital heavy businesses. The first step when considering a company's debt levels is to consider its cash and debt together.

What Is Harmonic's Net Debt?

The chart below, which you can click on for greater detail, shows that Harmonic had US$128.3m in debt in June 2024; about the same as the year before. On the flip side, it has US$45.9m in cash leading to net debt of about US$82.5m.

How Strong Is Harmonic's Balance Sheet?

According to the last reported balance sheet, Harmonic had liabilities of US$151.9m due within 12 months, and liabilities of US$169.0m due beyond 12 months. Offsetting this, it had US$45.9m in cash and US$123.7m in receivables that were due within 12 months. So its liabilities total US$151.3m more than the combination of its cash and short-term receivables.

Since publicly traded Harmonic shares are worth a total of US$1.62b, it seems unlikely that this level of liabilities would be a major threat. But there are sufficient liabilities that we would certainly recommend shareholders continue to monitor the balance sheet, going forward.

In order to size up a company's debt relative to its earnings, we calculate its net debt divided by its earnings before interest, tax, depreciation, and amortization (EBITDA) and its earnings before interest and tax (EBIT) divided by its interest expense (its 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).

While Harmonic's debt to EBITDA ratio (4.5) suggests that it uses some debt, its interest cover is very weak, at 1.8, suggesting high leverage. In large part that's due to the company's significant depreciation and amortisation charges, which arguably mean its EBITDA is a very generous measure of earnings, and its debt may be more of a burden than it first appears. It seems clear that the cost of borrowing money is negatively impacting returns for shareholders, of late. Even worse, Harmonic saw its EBIT tank 88% over the last 12 months. If earnings keep going like that over the long term, it has a snowball's chance in hell of paying off that debt. There's no doubt that we learn most about debt from the balance sheet. But ultimately the future profitability of the business will decide if Harmonic can strengthen its balance sheet over time. So if you're focused on the future you can check out this free report showing analyst profit forecasts.

Finally, a company can only pay off debt with cold hard cash, not accounting profits. So we always check how much of that EBIT is translated into free cash flow. In the last three years, Harmonic created free cash flow amounting to 14% of its EBIT, an uninspiring performance. That limp level of cash conversion undermines its ability to manage and pay down debt.

Our View

On the face of it, Harmonic's interest cover left us tentative about the stock, and its EBIT growth rate was no more enticing than the one empty restaurant on the busiest night of the year. But at least it's pretty decent at staying on top of its total liabilities; that's encouraging. Overall, we think it's fair to say that Harmonic has enough debt that there are some real risks around the balance sheet. If everything goes well that may pay off but the downside of this debt is a greater risk of permanent losses. There's no doubt that we learn most about debt from the balance sheet. However, not all investment risk resides within the balance sheet - far from it. To that end, you should be aware of the 3 warning signs we've spotted with Harmonic .

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.