Dividend reinvestment uses a cash distribution to buy additional shares. Those shares can receive later distributions, which may then buy still more shares. This is the compounding mechanism. The outcome still depends on actual prices, actual distributions, costs and tax.
Model it: use the Dividend Reinvestment Calculator to compare reinvesting each modeled payment with holding the same payments as cash. For a current income estimate without a growth projection, use the Dividend Income Calculator.
Each reinvestment changes the next share count
For each payment period, the basic steps are:
- Calculate the distribution: shares before payment × dividend per share.
- Calculate shares purchased: distribution ÷ reinvestment price.
- Add those shares to the holding before the next payment.
A calculator must state the timing convention because using the start-of-period price, end-of-period price or an actual plan execution price can produce different results.
A one-year example with a constant price
Assume an initial €10,000 holding at €50 per share, a quarterly dividend of €0.50 per share, no dividend growth, no price change, fractional shares and no tax or fees.
| Payment | Starting shares | Dividend | Shares bought at €50 | Ending shares |
|---|---|---|---|---|
| 1 | 200.0000 | €100.00 | 2.0000 | 202.0000 |
| 2 | 202.0000 | €101.00 | 2.0200 | 204.0200 |
| 3 | 204.0200 | €102.01 | 2.0402 | 206.0602 |
| 4 | 206.0602 | €103.03 | 2.0606 | 208.1208 |
The reinvested holding ends with about 208.1208 shares. Holding the four payments as cash would leave the original 200 shares and €400 cash. At the unchanged €50 share price, reinvestment ends slightly ahead because later dividends were paid on the added shares.
Price changes affect how many shares are purchased
A fixed cash distribution buys more shares at a lower reinvestment price and fewer at a higher price. That does not make a price decline automatically beneficial: the existing holding also loses market value, and the dividend itself may change.
A smooth projection that applies one annual price-growth rate cannot reproduce market volatility or the actual price on each payment date. It is a scenario, not a backtest or forecast.
Dividend growth and dividend yield are not the same input
Dividend growth changes the payment per share. Dividend yield also depends on share price. A dividend can grow while current yield falls if price rises faster, or current yield can rise while the dividend is unchanged if price falls.
What a reinvestment projection commonly omits
- tax and withholding before cash is reinvested;
- brokerage fees, plan charges, spreads and fractional-share restrictions;
- foreign-exchange movements;
- dividend cuts, suspensions and special distributions;
- different reinvestment dates or prices; and
- the effect of later purchases, sales or withdrawals.
Related concept: dividend yield vs total return shows how income and price change fit together when evaluating an investment result.
Methodology and sources
The Finance Charts calculator compounds at each selected payment interval. Annual price and dividend-growth assumptions are converted to equivalent periodic rates. The cash comparison keeps the original share count and accumulates distributions without interest. Values are rounded only for display.
Important: reinvestment increases exposure to the same investment. It does not diversify the holding or guarantee a positive return.