The formula (and the one that matters more)
Dividend yield = annual dividend per share ÷ current share price. A $50 stock paying $2 a year yields 4%. It is a snapshot: when the price moves, the yield moves inversely, which is exactly why an unusually high yield deserves suspicion — it is often the mathematical echo of a price collapse.
Yield on cost replaces today's price with your average cost. Buy that stock at $35 years ago, and the same $2 payout is a 5.7% yield on cost — and every future dividend raise lifts it further, permanently, for you. It is the best single number for feeling what dividend growth investing actually does, even though it should never drive a buy/sell decision on its own (that job belongs to today's yield and the payout's safety).
Planning income with yield
The second panel turns yield into planning answers. At a 4% portfolio yield, $100,000 produces $4,000 a year; generating $40,000 a year takes $1 million. Small yield differences move required capital dramatically — at 3% that same income needs $1.33 million. That sensitivity is why income investors weigh yield against dividend safety so carefully: an extra point of yield is worthless if it comes with a payout cut in the next recession.
Spotting yield traps
- Yield far above the company's own five-year average.
- Payout ratio above ~80% of earnings (or of funds from operations for REITs).
- Falling revenue while the dividend keeps rising — payouts funded by debt.
- A dividend history with cuts in past downturns.