Is Signature Aviation plc (LON:SIG) a good dividend stock? How can we tell? Dividend paying companies with growing earnings can be highly rewarding in the long term. If you are hoping to live on your dividends, it's important to be more stringent with your investments than the average punter. Regular readers know we like to apply the same approach to each dividend stock, and we hope you'll find our analysis useful.

With Signature Aviation yielding 8.1% and having paid a dividend for over 10 years, many investors likely find the company quite interesting. It would not be a surprise to discover that many investors buy it for the dividends. Remember that the recent share price drop will make Signature Aviation's yield look higher, even though recent events might have impacted the company's prospects. When buying stocks for their dividends, you should always run through the checks below, to see if the dividend looks sustainable.

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Payout ratios

Companies (usually) pay dividends out of their earnings. If a company is paying more than it earns, the dividend might have to be cut. As a result, we should always investigate whether a company can afford its dividend, measured as a percentage of a company's net income after tax. In the last year, Signature Aviation paid out 126% of its profit as dividends. A payout ratio above 100% is definitely an item of concern, unless there are some other circumstances that would justify it.

We also measure dividends paid against a company's levered free cash flow, to see if enough cash was generated to cover the dividend. Signature Aviation paid out a conservative 38% of its free cash flow as dividends last year. It's disappointing to see that the dividend was not covered by profits, but cash is more important from a dividend sustainability perspective, and Signature Aviation fortunately did generate enough cash to fund its dividend. If executives were to continue paying more in dividends than the company reported in profits, we'd view this as a warning sign. Extraordinarily few companies are capable of persistently paying a dividend that is greater than their profits.

Is Signature Aviation's Balance Sheet Risky?

As Signature Aviation's dividend was not well covered by earnings, we need to check its balance sheet for signs of financial distress. A rough way to check this is with these two simple ratios: a) net debt divided by EBITDA (earnings before interest, tax, depreciation and amortisation), and b) net interest cover. Net debt to EBITDA measures total debt load relative to company earnings (lower = less debt), while net interest cover measures the ability to pay interest on the debt (higher = greater ability to pay interest costs). With net debt of 2.53 times its EBITDA, Signature Aviation has a noticeable amount of debt, although if business stays steady, this may not be overly concerning.

We calculated its interest cover by measuring its earnings before interest and tax (EBIT), and dividing this by the company's net interest expense. With EBIT of 1.78 times its interest expense, Signature Aviation's interest cover is starting to look a bit thin.

Remember, you can always get a snapshot of Signature Aviation's latest financial position, by checking our visualisation of its financial health.

Dividend Volatility

Before buying a stock for its income, we want to see if the dividends have been stable in the past, and if the company has a track record of maintaining its dividend. Signature Aviation has been paying dividends for a long time, but for the purpose of this analysis, we only examine the past 10 years of payments. Its dividend payments have declined on at least one occasion over the past ten years. During the past ten-year period, the first annual payment was US$0.14 in 2010, compared to US$0.16 last year. Dividends per share have grown at approximately 1.1% per year over this time. The growth in dividends has not been linear, but the CAGR is a decent approximation of the rate of change over this time frame.

Modest growth in the dividend is good to see, but we think this is offset by historical cuts to the payments. It is hard to live on a dividend income if the company's earnings are not consistent.

Dividend Growth Potential

Given that the dividend has been cut in the past, we need to check if earnings are growing and if that might lead to stronger dividends in the future. Signature Aviation's earnings per share have shrunk at 16% a year over the past five years. A sharp decline in earnings per share is not great from from a dividend perspective, as even conservative payout ratios can come under pressure if earnings fall far enough.

Conclusion

To summarise, shareholders should always check that Signature Aviation's dividends are affordable, that its dividend payments are relatively stable, and that it has decent prospects for growing its earnings and dividend. We're not keen on the fact that Signature Aviation paid out such a high percentage of its income, although its cashflow is in better shape. Earnings per share are down, and Signature Aviation's dividend has been cut at least once in the past, which is disappointing. With this information in mind, we think Signature Aviation may not be an ideal dividend stock.

Investors generally tend to favour companies with a consistent, stable dividend policy as opposed to those operating an irregular one. Meanwhile, despite the importance of dividend payments, they are not the only factors our readers should know when assessing a company. For example, we've identified 5 warning signs for Signature Aviation (1 is a bit unpleasant!) that you should be aware of before investing.

Looking for more high-yielding dividend ideas? Try our curated list of dividend stocks with a yield above 3%.

If you spot an error that warrants correction, please contact the editor at editorial-team@simplywallst.com. This article by Simply Wall St is general in nature. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. Simply Wall St has no position in the stocks mentioned.

We aim to bring you long-term focused research analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Thank you for reading.