How the DRIP vs. Cash Formula Works
Our calculator runs two parallel projections using the exact same starting capital, contributions, growth rates, and tax rate:
- Without DRIP (Cash Payouts): Your share count only rises when you add new cash contributions. Dividends are paid out to you and do not buy new shares.
- With DRIP Enabled: At the end of each payment period, your after-tax dividend buys additional shares at the current share price:
After-Tax Dividend = Shares × Period Dividend Per Share × (1 - Tax Rate)
New DRIP Shares = After-Tax Dividend ÷ Current Share PriceWorked Example: $25,000 Invested Over 20 Years
Suppose you invest **$25,000** today and add **$200 per month** into a dividend ETF yielding **3.5%**, with **6% annual dividend growth**, **6% annual share price growth**, quarterly payouts, and a **15% tax rate**.
Over 20 years, you put in **$73,000** out of pocket in both cases. Here is how the two paths finish at Year 20:
| Year 20 Outcome | Without DRIP (Cash) | With DRIP (Reinvested) | DRIP Advantage |
|---|---|---|---|
| Out-of-Pocket Contributions | $73,000 | $73,000 | $0 |
| Ending Share Portfolio Value | $174,606 | $258,284 | +$83,678 |
| Year 20 Annual Dividend Income | $5,890 / yr | $8,653 / yr | +$2,763 / yr |
| Total Gross Dividends Earned | $68,546 | $91,711 | +$23,165 |
By leaving DRIP turned on during your working years, you finish with **$83,678 more in share value** and collect **$2,763 more per year** in dividend income when you are ready to retire. To see a full chart of a single DRIP plan, visit our dedicated DRIP calculator.
Common Mistakes With Dividend Reinvestment
- Leaving DRIP on when a stock becomes overvalued or troubled: Automatic reinvestment buys shares at whatever price the market sets on payday. If a company’s business is declining, you may prefer taking the cash and investing it elsewhere.
- Not tracking cost basis lots in taxable accounts: Every quarterly DRIP purchase creates a separate tax lot with its own purchase date and price. Modern US brokers track this automatically, but you should check your cost basis method before selling shares.
- Forgetting to turn DRIP off in retirement: When you are ready to pay bills with your dividends, switch your brokerage setting from "Reinvest" to "Deposit to Core Cash" a few weeks before the next ex-dividend date. Read our complete guide to DRIP investing for more tips.