Dividend Reinvestment Calculator

Why reinvesting changes the shape of the result

Taking dividends as cash gives you a return made of two separate parts: the income you spend, and whatever the share price does. Reinvesting merges them. Each payment buys more shares, those shares pay their own dividends, and the number of shares you own starts compounding alongside the price.

That second compounding is the whole effect. Over ten years it is modest. Over thirty it is usually the larger half of the total return on a high-yield holding, which is why long-run charts of index total return and index price return diverge so sharply.

This calculator runs both paths side by side on identical assumptions, so the gap you see is the reinvestment decision on its own and nothing else.

Yield on cost, and why it is not a yield

After a decade of dividend growth, the income you receive measured against what you originally paid can look extraordinary. Twelve percent, fifteen, twenty. That figure is yield on cost, and it describes your history rather than a property of the investment.

It matters because it gets used to justify holding something. The honest test is the current yield against the current price, because that is the choice actually in front of you: hold, or sell and buy something else. A 20% yield on cost tells you the past went well. It says nothing about the next decade.

The tool shows both, so the difference stays visible.

What this does not model

No tax. In a taxable account dividends are generally taxed on receipt whether or not you reinvest, which reduces the amount actually buying new shares. Inside a tax-sheltered account the untaxed figure is roughly right.

No dividend cuts. Growth is applied as a constant rate, and real companies suspend and cut. Checking payout ratio and cash coverage is the other half of this question.

No fractional-share limits and no trading costs. Most brokers support fractional reinvestment now, but if yours does not, small dividends will sit as cash until they buy a whole share.

What the compounding looks like year by year

Run the default figures and the useful thing is not the final balance, it is watching two separate quantities grow at once. The dividend per share rises because the company keeps raising it. The number of shares rises because each payment buys more. Income is the product of the two.

Starting from $10,000 at a 3% yield, with the dividend growing 6% a year and the share price 5%, the position develops like this.

Where the income growth actually comes from

The table above is worth decomposing, because the result is cleaner than most people expect. Over twenty years the annual income rises from $300 to $1,782, which is 5.9 times.

The dividend per share only grew 3.2 times, from $3.00 to $9.62. The share count grew 1.85 times, from 100 to 185.3. Multiply those two together and you get the 5.9. Roughly speaking, the company did half the work and reinvestment did the other half.

That is the entire argument for a DRIP in one line. You are not just holding an asset whose payout rises. You are holding a growing number of units of it, and the two effects multiply rather than add.

When not to reinvest

Reinvesting into the same holding makes it a larger share of your portfolio every year, automatically and without a decision being made. If the position is already your biggest, the dividend is the cheapest opportunity you have to rebalance, because directing it elsewhere costs nothing and triggers no sale.

There are three other cases where taking the cash is the better answer. If you need the income to live on, that is what it is for. If you think the holding is expensive, reinvesting is buying more at a price you would not choose. And if you hold it in a taxable account and the tax is due on receipt anyway, you may prefer to control where the after-tax money goes.

None of that argues against reinvestment as a default. It argues against reinvestment as an unexamined one.

Common questions

What is a DRIP?

A dividend reinvestment plan: an instruction that uses each dividend payment to buy more shares of the same holding instead of paying you cash. Most brokers and fund platforms offer it as a simple toggle.

Is reinvesting always better than taking the cash?

It produces a larger balance whenever the holding grows, so mathematically yes. Whether it is better depends on what else you would do with the money. Reinvesting also concentrates you further into one position, which is the argument for taking the cash and directing it elsewhere.

Do I pay tax on dividends I reinvest?

In a taxable account, usually. Reinvesting is treated as receiving the dividend and then buying shares, so the tax falls due even though no cash reached you. Inside a tax-sheltered account it generally does not.

What dividend growth rate should I use?

Use the actual five-year growth of the specific holding rather than a market average. A mature utility and a young dividend grower behave nothing alike, and the growth rate compounds harder than the starting yield does.

Why is the yield on cost so high after twenty years?

Because the dividend per share grew while your purchase price stayed fixed. It is arithmetic about the past. Use the current yield when deciding whether to keep holding.

Does this account for dividend cuts?

No, it applies a constant growth rate throughout. Check the payout ratio and free cash flow coverage of anything you model, because a dividend covered 1.1 times by cash is a very different proposition from one covered three times.

How much of the total return comes from reinvested dividends?

It depends entirely on the yield and the holding period. On the default figures here, reinvesting turns $37,569 into $49,154 over twenty years, so roughly 24% of the ending value exists only because the payments were reinvested. On a higher-yield holding over a longer period the share is larger; on a low-yield growth stock it is small.

Does the starting share price matter?

No. The tool uses a notional $100 share price internally and every figure it reports is a ratio, so the price cancels out. What matters is the yield, the two growth rates and the time.

Why does the share count grow more slowly over time?

Because each dividend buys shares at the prevailing price, and the price is rising. Later payments are larger in dollars but buy proportionally fewer shares. The income keeps accelerating anyway, because the dividend per share is growing at the same time.