Dividend Reinvestment Plan (DRIP) Calculator
Estimate how your portfolio can grow when dividends are reinvested into additional shares.
What this dividend reinvestment calculator does
A dividend reinvestment plan (DRIP) automatically uses cash dividends to buy more shares. This calculator models that process over time, including contributions, dividend growth, share price growth, and taxes on dividends.
The key idea is simple: each new share can produce future dividends, and those dividends can buy even more shares. Over long periods, this can create a compounding effect that is easy to underestimate.
How the model works
1) Starting shares
Your initial investment is converted into shares using the initial share price. Example: $10,000 at $50/share starts with 200 shares.
2) Monthly simulation
The calculator runs month by month. It applies your monthly contribution, checks whether a dividend payment occurs (monthly, quarterly, etc.), and then updates share price and dividend-per-share growth assumptions.
3) Dividends and reinvestment
- Gross dividend: shares owned × annual dividend per share ÷ payment frequency.
- After-tax dividend: gross dividend × (1 - tax rate).
- If DRIP is on: after-tax dividend buys additional shares at the current price.
- If DRIP is off: dividends are accumulated as cash instead of buying shares.
Inputs that matter most
Dividend yield
A higher starting yield means larger early cash payouts. But very high yields can signal higher risk in real markets, so keep assumptions realistic.
Dividend growth rate
Dividend growth is often the most powerful long-term driver for income-focused investors. A modest increase sustained for decades can materially change final outcomes.
Share price growth
Price growth impacts the value of your holdings. It can also change how many shares your dividends and contributions can buy in future years.
Contribution level and time horizon
Consistency beats intensity. A steady monthly contribution over 20 to 30 years can have more impact than trying to time the market.
How to interpret your results
- Ending Portfolio Value: market value of shares plus dividend cash (if not reinvested).
- Total Contributions: your initial investment plus all monthly additions.
- Total Dividends (Net): dividends after the selected tax rate.
- Estimated Annual Dividend Income: projected one-year dividend cash flow at the end of the period.
- Inflation-Adjusted Value: a rough estimate of purchasing power in today’s dollars.
Important caveats
This is an educational projection, not a guarantee. Real investing includes volatility, dividend cuts, valuation changes, taxes, fees, and behavioral decisions. Use this as a planning tool and compare multiple scenarios (conservative, base, and optimistic) before making decisions.