Current annual dividend income / cost basis
You can use either the total dividend income and cost basis or the per-share amounts for this formula.
For example, say you invested $7,500 into a dividend-paying stock over the past several years that now produces $528 of dividend income each year. To determine the yield on cost for this investment, you’d divide 528 into 7,500 and get 0.07 or 7%.
Looking at this formula on a per-share basis, let’s say you bought 100 shares of a stock at an average price of $75 per share. That company has increased its dividend payment over the years and now pays $5.28 per share in dividends each year. To determine the yield on cost, you’d divide $5.28 into $75, which would give you that same 7% yield.