Sonic Automotive, Inc.'s (NYSE:SAH) price-to-earnings (or "P/E") ratio of 16.4x might make it look like a buy right now compared to the market in the United States, where around half of the companies have P/E ratios above 20x and even P/E's above 35x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's limited.

Sonic Automotive could be doing better as its earnings have been going backwards lately while most other companies have been seeing positive earnings growth. The P/E is probably low because investors think this poor earnings performance isn't going to get any better. If this is the case, then existing shareholders will probably struggle to get excited about the future direction of the share price.

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What Are Growth Metrics Telling Us About The Low P/E?

The only time you'd be truly comfortable seeing a P/E as low as Sonic Automotive's is when the company's growth is on track to lag the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 34%. This means it has also seen a slide in earnings over the longer-term as EPS is down 60% in total over the last three years. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Turning to the outlook, the next three years should generate growth of 33% per annum as estimated by the nine analysts watching the company. That's shaping up to be materially higher than the 12% per year growth forecast for the broader market.

In light of this, it's peculiar that Sonic Automotive's P/E sits below the majority of other companies. It looks like most investors are not convinced at all that the company can achieve future growth expectations.

The Key Takeaway

Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

We've established that Sonic Automotive currently trades on a much lower than expected P/E since its forecast growth is higher than the wider market. There could be some major unobserved threats to earnings preventing the P/E ratio from matching the positive outlook. At least price risks look to be very low, but investors seem to think future earnings could see a lot of volatility.

If you're unsure about the strength of Sonic Automotive's business, why not explore our interactive list of stocks with solid business fundamentals for some other companies you may have missed.

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.