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.' When we think about how risky a company is, we always like to look at its use of debt, since debt overload can lead to ruin. Importantly, Advanced Drainage Systems, Inc. (NYSE:WMS) does carry debt. But is this debt a concern to shareholders?

Why Does Debt Bring Risk?

Debt assists a business until the business has trouble paying it off, either with new capital or with free cash flow. In the worst case scenario, a company can go bankrupt if it cannot pay its creditors. 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. Of course, the upside of debt is that it often represents cheap capital, especially when it replaces dilution in a company with the ability to reinvest at high rates of return. When we examine debt levels, we first consider both cash and debt levels, together.

What Is Advanced Drainage Systems's Net Debt?

The chart below, which you can click on for greater detail, shows that Advanced Drainage Systems had US$1.27b in debt in June 2024; about the same as the year before. However, because it has a cash reserve of US$541.6m, its net debt is less, at about US$727.2m.

How Healthy Is Advanced Drainage Systems' Balance Sheet?

We can see from the most recent balance sheet that Advanced Drainage Systems had liabilities of US$492.9m falling due within a year, and liabilities of US$1.67b due beyond that. On the other hand, it had cash of US$541.6m and US$369.3m worth of receivables due within a year. So its liabilities outweigh the sum of its cash and (near-term) receivables by US$1.26b.

Since publicly traded Advanced Drainage Systems shares are worth a very impressive total of US$11.8b, it seems unlikely that this level of liabilities would be a major threat. Having said that, it's clear that we should continue to monitor its balance sheet, lest it change for the worse.

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). Thus we consider debt relative to earnings both with and without depreciation and amortization expenses.

Advanced Drainage Systems's net debt is only 0.85 times its EBITDA. And its EBIT covers its interest expense a whopping 11.1 times over. So you could argue it is no more threatened by its debt than an elephant is by a mouse. Advanced Drainage Systems's EBIT was pretty flat over the last year, but that shouldn't be an issue given the it doesn't have a lot of debt. When analysing debt levels, the balance sheet is the obvious place to start. But ultimately the future profitability of the business will decide if Advanced Drainage Systems 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 business needs free cash flow to pay off debt; accounting profits just don't cut it. So we always check how much of that EBIT is translated into free cash flow. Over the most recent three years, Advanced Drainage Systems recorded free cash flow worth 62% of its EBIT, which is around normal, given free cash flow excludes interest and tax. This free cash flow puts the company in a good position to pay down debt, when appropriate.

Our View

Advanced Drainage Systems's interest cover suggests it can handle its debt as easily as Cristiano Ronaldo could score a goal against an under 14's goalkeeper. And that's just the beginning of the good news since its net debt to EBITDA is also very heartening. Taking all this data into account, it seems to us that Advanced Drainage Systems takes a pretty sensible approach to debt. While that brings some risk, it can also enhance returns for shareholders. The balance sheet is clearly the area to focus on when you are analysing debt. But ultimately, every company can contain risks that exist outside of the balance sheet. Case in point: We've spotted 1 warning sign for Advanced Drainage Systems you should be aware of.

If, after all that, you're more interested in a fast growing company with a rock-solid balance sheet, then check out our list of net cash growth stocks without delay.

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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.