What DRIP means
DRIP is short for dividend reinvestment plan. In a reinvested-dividend scenario, dividends are used to purchase more of the asset. Over time, that can increase the number of shares or fund units owned, which can increase future dividend income and total portfolio value if returns are positive.
This is why total-return data matters. Adjusted price history attempts to reflect dividends and splits, making it more appropriate for estimating the historical return of a reinvested-dividend path. Regular closing prices show the market price path without quietly folding dividends into the price series.
How the simulator treats the setting
When reinvest dividends is turned on, Portfolio Modeler uses adjusted historical price behavior for return assumptions. When reinvest dividends is turned off, it uses regular closing price behavior for the price-growth assumption and models dividends separately as cash income. That distinction is important because otherwise the model could double count dividends or assume reinvestment when the user meant to take cash.
Dividend taxes are applied to the dividend stream based on the selected tax rate. If dividends are reinvested, the after-tax dividend amount is added back into the portfolio. If dividends are not reinvested, the after-tax dividend amount is treated as income outside the growth path.
Why no-DRIP can be useful
No-DRIP modeling can be helpful for investors who plan to use dividends for spending or who want to estimate income separately from portfolio appreciation. It can also be useful when comparing income-oriented portfolios against total-return portfolios. The final-year dividend section is designed for that question: it estimates the annual dividend income run-rate near the end of the simulation.
A no-DRIP path may show a lower final portfolio value because cash is leaving the compounding engine. That does not automatically mean the portfolio is worse. If the goal is income generation, the tradeoff may be intentional.
Where taxes complicate the picture
Dividend taxes can reduce the amount available for reinvestment or spending. In taxable accounts, qualified dividends, ordinary dividends, fund distributions, and foreign withholding can receive different treatment. The simulator uses a simplified dividend-tax input so visitors can stress test the effect of taxes without trying to reproduce every detail of a personal tax return.
- Use DRIP on when studying accumulation and compounding.
- Use DRIP off when studying cash income or spending from dividends.
- Review the dividend tax setting before comparing income-heavy portfolios.
- Remember that dividend policies can change over time.