Today we'll take a closer look at Equinor ASA (OB:EQNR) from a dividend investor's perspective. Owning a strong business and reinvesting the dividends is widely seen as an attractive way of growing your wealth. Yet sometimes, investors buy a stock for its dividend and lose money because the share price falls by more than they earned in dividend payments.

With Equinor yielding 5.1% and having paid a dividend for over 10 years, many investors likely find the company quite interesting. We'd guess that plenty of investors have purchased it for the income. When buying stocks for their dividends, you should always run through the checks below, to see if the dividend looks sustainable.

Click the interactive chart for our full dividend analysis

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. Comparing dividend payments to a company's net profit after tax is a simple way of reality-checking whether a dividend is sustainable. In the last year, Equinor paid out 64% of its profit as dividends. A payout ratio above 50% generally implies a business is reaching maturity, although it is still possible to reinvest in the business or increase the dividend over time.

Another important check we do is to see if the free cash flow generated is sufficient to pay the dividend. Equinor paid out 57% of its free cash flow last year, which is acceptable, but is starting to limit the amount of earnings that can be reinvested into the business. It's positive to see that Equinor'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 Equinor's latest financial position, by checking our visualisation of its financial health.

Dividend Volatility

From the perspective of an income investor who wants to earn dividends for many years, there is not much point buying a stock if its dividend is regularly cut or is not reliable. Equinor has been paying dividends for a long time, but for the purpose of this analysis, we only examine the past 10 years of payments. This dividend has been unstable, which we define as having fallen by at least 20% one or more times over this time. During the past ten-year period, the first annual payment was US$1.10 in 2010, compared to US$1.04 last year. The dividend has shrunk at a rate of less than 1% a year over this period.