Dividend paying stocks like Wärtsilä Oyj Abp (HEL:WRT1V) tend to be popular with investors, and for good reason - some research suggests a significant amount of all stock market returns come from reinvested dividends. Yet sometimes, investors buy a popular dividend stock because of its yield, and then lose money if the company's dividend doesn't live up to expectations.

With Wärtsilä Oyj Abp yielding 4.3% 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. There are a few simple ways to reduce the risks of buying Wärtsilä Oyj Abp for its dividend, and we'll go through these below.

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Payout ratios

Dividends are usually paid out of company earnings. If a company is paying more than it earns, then the dividend might become unsustainable - hardly an ideal situation. So we need to form a view on if a company's dividend is sustainable, relative to its net profit after tax. Wärtsilä Oyj Abp paid out 76% of its profit as dividends, over the trailing twelve month period. Paying out a majority of its earnings limits the amount that can be reinvested in the business. This may indicate a commitment to paying a dividend, or a dearth of investment opportunities.

Another important check we do is to see if the free cash flow generated is sufficient to pay the dividend. The company paid out 78% of its free cash flow as dividends last year, which is adequate, but reduces the wriggle room in the event of a downturn. It's positive to see that Wärtsilä Oyj Abp's dividend is covered by both profits and cash flow, since this is generally a sign that the dividend is sustainable, and a lower payout ratio usually suggests a greater margin of safety before the dividend gets cut.

Remember, you can always get a snapshot of Wärtsilä Oyj Abp'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. Wärtsilä Oyj Abp has been paying dividends for a long time, but for the purpose of this analysis, we only examine the past 10 years of payments. During this period the dividend has been stable, which could imply the business could have relatively consistent earnings power. During the past ten-year period, the first annual payment was €0.25 in 2009, compared to €0.48 last year. Dividends per share have grown at approximately 6.7% per year over this time.