Dividend Reinvestment Calculator
Project a holding forward with every dividend reinvested, showing the share count compounding and how much of the final value reinvestment alone contributed.
How to use this calculator
- 1Enter your current shares, the share price, and the annual dividend paid per share.
- 2Set how fast you expect the dividend per share to grow — for an established payer this is often in the low-to-mid single digits.
- 3Set expected price growth separately, since a rising price means each reinvested dividend buys fewer shares.
- 4Look at the income column rather than only the final value: the point of a reinvestment plan is usually the income it eventually produces.
How the calculation works
Each year: income = shares × dividend; shares = shares + income ÷ new price; dividend = dividend × (1 + growth)- shares
- The holding, which grows every year as dividends buy more
- dividend
- Annual dividend per share, itself rising at the growth rate entered
- new price
- The share price after that year's price growth — what the reinvestment pays
This compounds on two axes at once, which is what makes reinvestment powerful over long horizons: the dividend per share rises, and the number of shares receiving it also rises. Neither alone produces the curve; together they do.
Reinvestment is modelled annually and buys fractional shares. Real plans usually reinvest at each payment date — quarterly reinvestment compounds slightly faster than the annual figure shown here, so this is the conservative reading.
A rising share price is not unambiguously good for a reinvestment plan. It raises the value of what is held but means each dividend buys fewer new shares, which is why price growth and dividend growth are entered separately rather than as one number.
Worked example
500 shares at 50, reinvested for 20 years
- 1.Year one pays 500 × 2 = 1,000 in dividends. The price rises 5% to 52.50, so that 1,000 buys 19.05 more shares.
- 2.Year two starts with 519.05 shares and a dividend of 2.10 per share, paying 1,090 — more shares receiving a larger dividend.
- 3.Both compounding effects continue for twenty years, and the share count rises steadily without any further money being added.
Result: A materially larger holding and income, from reinvestment alone
Adding 3,000 a year alongside
- 1.Each year the dividends are reinvested as before, and a further 3,000 of new money buys shares at that year's price.
- 2.Over twenty years that adds 60,000 of contributions, each tranche then earning dividends that are themselves reinvested.
- 3.The final income figure rises substantially, because every added share pays a dividend for every remaining year.
Result: Far higher income, from 60,000 of contributions plus compounding
What reinvestment actually changes
A dividend reinvestment plan does one simple thing: instead of paying the dividend into a bank account, it buys more shares of the same company. Most brokers and many companies offer this automatically, often with fractional shares so no cash is left idle.
The consequence is that a holding starts compounding on two axes rather than one. The dividend per share may grow, as an established payer raises it over time. And the number of shares receiving that dividend also grows, because each payment buys more. Either effect alone produces steady growth; together they produce a curve that bends upward, and over a multi-decade horizon the share count can grow substantially without a single additional deposit.
Why price growth cuts both ways
It is natural to assume a rising share price is straightforwardly good news for a reinvestment plan. It is not, and the reason is worth understanding.
A rising price increases the value of the shares already held, which is welcome. But it also means every reinvested dividend buys fewer new shares than it would have at a lower price. For someone still accumulating — years away from wanting the income — a long stretch of flat or falling prices with a maintained dividend actually builds a larger share count, and therefore a larger eventual income, than the same dividend reinvested into a rising market. This is the same logic that makes rupee-cost averaging work, applied to dividends rather than to contributions, and it is why this calculator asks for dividend growth and price growth as separate inputs rather than folding them into a single total-return figure.
The assumptions that matter most
A twenty- or thirty-year projection is extremely sensitive to inputs that are easy to enter carelessly. Three deserve particular scrutiny.
- Dividend growth — the single most influential figure over long horizons. Established payers commonly raise dividends in the low-to-mid single digits; assuming a high rate sustained for decades is a strong claim that few companies have ever met.
- That the dividend survives at all — the projection assumes uninterrupted payment for the whole period. Dividends are declared payment by payment and are cut in recessions, sometimes across entire sectors at once. A thirty-year projection quietly assumes thirty years without a suspension.
- Tax treatment — in a taxable account, reinvested dividends are usually taxed on receipt even though no cash was taken. That drag is not modelled here and materially reduces real-world compounding outside a tax-sheltered account.
Concentration, and the case for the boring alternative
Reinvesting into the same company steadily increases how much of a portfolio depends on that one holding. A position that started at 5% can become the dominant one over a couple of decades, purely through automatic reinvestment and without any deliberate decision to concentrate. That is a real risk that the growing income figure obscures.
It is also worth saying plainly that a dividend reinvestment plan is not inherently superior to reinvesting into a diversified fund. The compounding mechanism is the same in both; what differs is the concentration. The genuine advantages of a single-company plan are its automation and the absence of the temptation to spend the cash — behavioural, not mathematical.
What this assumes, and where it stops
Assumptions
- Dividends are reinvested once a year at that year's share price, and fractional shares are available.
- The dividend per share grows at a constant rate and is never cut or suspended.
- The share price grows at a constant rate, which no real share does.
- No tax is deducted. In a taxable account reinvested dividends are typically taxed on receipt, which reduces compounding.
Limitations
- Constant growth rates are a modelling convenience. Real dividends are cut in downturns, and real prices move in sequences that change the outcome.
- Annual reinvestment is modelled; real plans usually reinvest quarterly, which compounds slightly faster than shown.
- Tax drag on reinvested dividends is not deducted and is significant outside a tax-sheltered account.
- Reinvesting into one company concentrates the portfolio over time, a risk this projection does not quantify.
Common questions
Is reinvesting dividends better than taking the cash?
For long-horizon compounding, reinvesting builds a larger holding and a larger eventual income, because each payment buys shares that themselves pay dividends. But the comparison is not quite as one-sided as it looks: cash taken out is not destroyed, and could be invested elsewhere or spent on something valuable. The real advantages of automatic reinvestment are that it happens without a decision and removes the temptation to spend — behavioural rather than mathematical.
Does a rising share price help or hurt a reinvestment plan?
Both, and which dominates depends on where you are. A higher price raises the value of shares already held, but every reinvested dividend then buys fewer new shares. For someone still accumulating and years from needing income, a long flat or falling stretch with the dividend maintained actually builds a larger share count and a larger eventual income. That is why dividend growth and price growth are entered separately here rather than combined.
Are reinvested dividends taxed?
In a taxable account, usually yes — most jurisdictions tax a dividend when it is paid, regardless of whether the cash was taken or automatically used to buy more shares. This creates a tax bill with no cash received to pay it, and the drag compounds over decades. Inside a tax-sheltered account the issue disappears. This calculator shows gross figures, so a taxable-account projection should be read as an upper bound.
What dividend growth rate should I assume?
Be conservative. Established dividend payers have historically raised payments in the low-to-mid single digits per year on average, and a rate sustained across decades is a strong claim — the companies that have managed it for thirty years or more are a small and well-known group. Because the projection compounds, an over-optimistic growth rate produces a wildly overstated final figure. Try a lower rate as well and see how much the conclusion depends on the assumption.
Sources
- Dividend Reinvestment Plans — US Securities and Exchange Commission (Investor.gov)
- Compound Interest and Investing — US Securities and Exchange Commission (Investor.gov)
Formula and content last reviewed on .
Results are estimates for information only, not professional advice.
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