What it means
The theory rests on where value actually comes from. A company is worth the cash its assets are expected to generate, and deciding to hand some of that cash over sooner rather than later does not change how much the assets will produce.
The mechanism is the homemade dividend. If a shareholder wants cash and the company pays none, they can sell a small slice of their holding; if the company pays a dividend they do not want, they can reinvest it, so the shareholder can manufacture whatever income pattern they prefer.
The assumptions are what makes the argument work, and they are strict. No taxes, no transaction costs, no difference in information between managers and investors, and an investment policy that is fixed regardless of how much is paid out.
Once you relax the assumptions, dividends start to matter again. Tax treatment can favour capital gains or dividends, dealing costs make homemade dividends imperfect, and in the real world a dividend announcement carries information about what management expects, which is the signalling effect.
The theory is still useful, though, precisely because it tells you where to look. If dividend policy seems to affect a company's value, the cause is one of the frictions the theory strips out, not the payment itself.
In practice
Real-world examples.
Example
A board debating whether to start paying a dividend is told by its adviser that, in theory, the decision does not change the company's value. The adviser then spends the rest of the meeting on the reasons it might in practice: the shareholder register is full of income funds that cannot hold non-payers.
Example
An investor holding a fast-growing company that pays nothing sells 2% of her position each year to fund living costs. She is deliberately creating a homemade dividend, and in a market with low dealing costs it works almost as well as a paid distribution.
Example
A finance lecturer illustrates the theory by pointing out that a share price typically falls by roughly the dividend amount on the ex-dividend date. Shareholders are not richer the day after payment, they simply hold less company and more cash.
Formula
Calculation
There is no formula as such; the argument is demonstrated by showing that a shareholder ends up with the same total wealth either way.
Meridian Tools has a total value of $100 million and 10 million shares outstanding, so each share is worth $100 million / 10 million = $10.00. An investor owns 100 shares, worth 100 x $10.00 = $1,000.
Case one: the company pays a dividend of $1.00 per share, distributing 10 million x $1.00 = $10 million of cash. Company value falls to $100 million - $10 million = $90 million, so each share is now worth $90 million / 10 million = $9.00. The investor holds 100 x $9.00 = $900 of shares plus $100 of cash, a total of $1,000.
Case two: the company pays no dividend and the investor wants $100 of income anyway. She sells 10 shares at $10.00 each for $100 of cash and keeps 90 shares worth 90 x $10.00 = $900, again a total of $1,000. Under the theory's assumptions the two outcomes are identical, which is the whole point.Case study
Seen in the real world.
Larkfield Components is a fictional company used for this illustrative case study of dividend irrelevance. In the scenario, Larkfield was valued at $100 million with 10 million shares at $10.00, and its board split over whether to begin a $1.00 per share annual dividend.
The chief financial officer walked the board through the arithmetic. Paying $10 million out would leave the company worth $90 million and the shares at $9.00, so a holder of 100 shares would have $900 of stock and $100 of cash, exactly the $1,000 they held beforehand. Any shareholder wanting income without a dividend could sell ten shares and reach the identical position.
The board approved the dividend anyway, and the illustrative reason is instructive. Two large income funds had told management they could not hold a non-paying share, and the board judged that the signal of a sustainable payout would broaden the register. In other words the theory was correct about the arithmetic, and the frictions it excludes were what actually drove the decision.
Watch out
Common mistakes.
- Reading the theory as advice that dividends do not matter at all. It says value is unaffected under a specific set of assumptions, and those assumptions do not fully hold in any real market.
- Forgetting that investment policy is held constant in the argument. If paying a dividend forces a company to skip a profitable project or raise expensive new capital, value genuinely does change.
- Assuming homemade dividends are free. Selling shares to create income incurs dealing costs and may trigger capital gains tax, which is one of the frictions the theory sets aside.
Questions
People also ask.
Who developed dividend irrelevance theory?
Merton Miller and Franco Modigliani set it out in the early 1960s, alongside their better-known work on capital structure.
If dividends are irrelevant, why do share prices react to dividend news?
Because of signalling. A cut or an unexpected rise tells the market something about management's view of future cash flows, and it is the information, not the cash, that moves the price.
Does the theory apply to share buybacks too?
Yes, in the same way. Returning cash by buying back shares reduces company value by the amount spent, so under the theory the choice between dividend and buyback is a matter of tax and preference rather than value.
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