The quiet power of reinvested dividends
Over long periods, a large share of the stock market’s total return has come from dividends, and much of that from reinvesting them. Each dividend buys more shares, those shares pay dividends of their own, and the number of shares you own grows year after year without any new money from you.
How the calculator works
The model assumes a constant dividend yield y, a share price growing at rate g each year and a tax rate t on dividends:
- With reinvestment: each year the value grows by (1 + g) from the price and by (1 + y × (1 − t)) from the new shares. After n years: V = V₀ × [(1 + g)(1 + y(1 − t))]ⁿ
- Without reinvestment: the shares grow only with the price, V₀(1 + g)ⁿ, and you collect cash dividends that grow with the price too, totaling V₀ × y(1 − t) × [(1 + g)ⁿ − 1] ÷ g.
Worked example
You invest $10,000 in a stock or fund yielding 3%, with the price growing 5% a year, for 20 years, and pay 15% tax on dividends in a taxable account:
- With dividends reinvested: $43,904.
- Without: shares worth $26,533 plus $8,432 of cash dividends collected = $34,965.
- Reinvesting adds about $8,939.
- Your number of shares grows 1.65 times, and the dividends paid in year 20 reach about $1,120 after tax.
- The annual total return with reinvestment is 7.68%.
Taxes
In a regular brokerage account, dividends are taxed in the year they are paid, even when reinvested. Qualified dividends are taxed at 0%, 15% or 20% depending on your income, and ordinary dividends at your income tax rate. In a 401(k), IRA or Roth IRA, there is no tax on dividends along the way, so set the tax rate to 0%. Keep records of each reinvestment: it adds to your cost basis and reduces the capital gain when you sell.
How to reinvest
- Brokerage DRIP settings: most brokers let you reinvest dividends automatically, often in fractional shares and without commission.
- Company DRIPs: some companies run their own plans, occasionally at a small discount.
- Funds: mutual funds can reinvest distributions automatically; many ETFs can be set to reinvest through your broker.
When taking the cash makes sense
In retirement, dividends can cover spending without selling shares. Investors who rebalance can direct dividends to the asset classes that are below target. And a single stock’s dividend reinvested for decades can leave a portfolio dangerously concentrated.
Limits
Real yields and growth rates change from year to year, and companies can cut dividends. The model ignores fees and assumes dividends are reinvested at year-end prices. Use it to understand the size of the effect, not to forecast exact values.
This calculator gives estimates for education and planning. It is not investment, tax or legal advice; for decisions about your own situation, talk to a qualified financial professional.