Yield on Cost: The Long-Term Investor's Secret Metric

Yield on cost (YOC) is a metric that dividend investors love to celebrate — and for good reason. It measures the current annual dividend you receive as a percentage of what you originally paid for a stock, rather than its current market price. A high yield on cost is the tangible reward for patience, showing that years of dividend increases have turned a modest starting yield into something remarkable. But YOC also has important limitations that every investor should understand.

This article covers the formula, walks through a real-world example, explains when YOC is a useful metric, and warns against the common mistake of using it to justify holding a deteriorating position.

The Yield on Cost Formula

The calculation is simple:

Compare this with the standard dividend yield formula, which uses the current market price in the denominator instead of your purchase price. The difference between these two numbers grows wider as time passes and dividends increase, which is precisely the point.

The Coca-Cola Example

No discussion of yield on cost is complete without Coca-Cola (KO), the stock Warren Buffett famously bought in 1988. Buffett's Berkshire Hathaway purchased 400 million shares (split-adjusted) at an average cost of roughly $3.25 per share — a total investment of about $1.3 billion. At the time, KO's dividend was around $0.075 per share annually, giving Buffett an initial yield of approximately 2.3%.

Fast forward to today. Coca-Cola pays an annual dividend of $1.94 per share. On Buffett's $3.25 cost basis, his yield on cost is an astounding 59.7%. Berkshire Hathaway now collects roughly $776 million per year in dividends from a $1.3 billion investment — meaning the dividends alone have repaid the original investment many times over. This is the ultimate illustration of what dividend growth investing can achieve over decades.

Why YOC Matters for Income Investors

Yield on cost serves as a powerful motivational and tracking tool. When you can see that a stock you bought at a 2.5% yield is now yielding 8% on your original cost, it validates the dividend growth approach and encourages you to stay the course. It is also useful for comparing the income productivity of different positions in your portfolio — which holdings have rewarded you most over time?

YOC also helps frame retirement income planning. If you know that your positions have historically grown their YOC by 7-10% per year, you can project what your portfolio's income will look like in 5, 10, or 20 years. This is particularly relevant for investors in the accumulation phase who want to estimate when their portfolio will generate enough income to cover living expenses. See our guide on retirement dividend income for detailed calculations.

The Limitations of Yield on Cost

Here is where YOC becomes dangerous if misused. The most common mistake is using a high yield on cost to justify holding a stock that has deteriorated. Suppose you bought a stock at $30 with a $1.50 dividend (5% yield). The company raises dividends for five years, and your YOC reaches 7%. Then the company's fundamentals deteriorate: earnings decline, debt rises, and the stock drops to $15. Your YOC is still 7% — but the stock now has a market yield of 14%, signaling serious distress. The right question is not "what is my YOC?" but "would I buy this stock today at the current price and yield?"

YOC is a backward-looking metric. It tells you about the past relationship between your purchase price and current dividends. It says nothing about whether the company will maintain or grow its dividend going forward. For forward-looking decisions — whether to buy, hold, or sell — current market yield, payout ratio, and earnings trends are far more relevant. Consult our when to sell a dividend stock guide for proper sell discipline.

Yield on Cost With DRIP Reinvestment

When you reinvest dividends through a DRIP, calculating YOC becomes more complex. Each reinvested dividend buys new shares at different prices, altering your effective cost basis. Most investors handle this by calculating a blended YOC using their total cost basis (original investment plus all reinvested dividends) divided by total shares owned. The result is still instructive, but it will be lower than the simple YOC on the original shares because reinvested dividends tend to buy shares at higher prices over time as the stock appreciates.

Despite this complexity, DRIP reinvestment remains the most powerful way to accelerate your income growth. The additional shares purchased through reinvestment generate their own dividends, creating a compounding cycle that amplifies the benefits of dividend growth over time. For more on this topic, see our article on reinvesting vs. taking cash.