"DRIP" gets thrown around a lot on this site — it's in the name — but if nobody's ever walked you through what actually happens to your money on payout day, the word alone doesn't explain much. This page does that: what a DRIP is, what changes mechanically when you turn it on, and a real worked example so you can see the difference in dollars, not just theory.
DRIP is short for Dividend Reinvestment Plan. It's not a separate investment, a special account type, or a fund category — it's a setting. When a fund you own pays out cash (a dividend or distribution), you have exactly two choices for that cash: take it, or use it to automatically buy more of the same investment. DRIP is choosing the second option, every time, without having to manually reinvest it yourself.
Say you own units of an income fund that pays monthly. On the fund's payment date, it sends you cash proportional to how many units you hold — this is the distribution. With DRIP off, that cash lands in your account as spendable money and your position stays exactly the size it was. With DRIP on, that same cash is used to buy more units of the fund instead (often fractional units, since the payout rarely divides evenly into whole shares) — so next month, you own slightly more of the fund than you did before, which means next month's payout is calculated on a slightly bigger position. That's the entire mechanism. Nothing else changes: not the fund's payout rate, not its price, not any other rule. Just whether that one cash payment buys you more of the fund or stays as cash in your pocket.
The reason DRIP is worth understanding, not just enabling, is what happens when you repeat that mechanism over and over. Each reinvested payout doesn't just sit there — it becomes part of the position that generates the next payout. A slightly bigger position generates a slightly bigger dollar payout, which gets reinvested into an even bigger position, and so on. None of this requires the fund's price to go up or its payout rate to increase — it works from reinvestment alone, which is exactly why funds with little price growth (many of the monthly income funds this site is built around) still meaningfully compound when DRIP is left on.
Here's the actual math, not a rounded-off approximation — the same formula this site's calculators run. Say you put $10,000 into a fund paying 8% a year, distributed monthly, and you don't add another dollar to it. Five years later:
Same fund, same starting balance, same five years — the only difference is one setting, and it's a real $898.46 gap in final balance and a real $32.65/month gap in income, entirely from letting the payouts buy more of the fund instead of taking them as cash. You can plug your own numbers into the Single Fund Calculator and see this exact math run for a real starting balance, contribution, and payout rate.
It's worth being precise here: DRIP doesn't create extra money out of nowhere. Every dollar reinvested is a dollar you didn't take as cash that month. What it changes is when you receive the benefit — instead of a steady trickle of spendable cash starting immediately, you're letting the position grow so that the eventual income (and the balance behind it) is bigger. That's a completely reasonable trade while you're still building toward a goal. It's a much less obviously correct choice once you're actually relying on that monthly cash to live on — which is the honest answer to "should I turn DRIP off?"
The most common real reason to switch DRIP off isn't a market call — it's a life stage. If you've built a position specifically to generate spendable monthly income (which is what most of the income funds featured on this site are built for), the whole point of the exercise was to eventually take the cash. Turning DRIP off at that point isn't giving anything up; it's the plan working as intended. Some investors also turn it off temporarily to build up cash for an unrelated goal, or split the decision per holding — DRIP on for funds still in the growth phase, off for the ones already carrying their real income load. Machine-style multi-account trackers (and the account tools on this site) let you set DRIP per holding for exactly that reason — it's not an all-or-nothing switch across your whole portfolio.
Reinvesting a payout buys more units at whatever the fund's price happens to be that day — DRIP has no opinion on whether that's a good price or a bad one. If a fund's price has fallen well below what you originally paid, DRIP reinvestment is happening at that lower price, which means more units per dollar reinvested, but it doesn't undo or offset a real decline in the fund's value. DRIP is a mechanism for compounding a payout stream — it isn't a hedge, and it isn't a signal that the underlying fund is doing well. Worth keeping separate in your head, especially for a fund whose price trend you're unsure about — every fund page on this site has a Price Trend note for exactly that reason.
DRIP is one setting, with one mechanical effect: it turns a cash payout into more units of the same fund, which then generate their own payout next time. Whether that's the right setting for you depends entirely on whether you're still building toward a goal (DRIP on) or already living off the income (DRIP off, at least for that holding). Either way, now you know exactly what's happening under the hood instead of just flipping a switch labeled "DRIP" and hoping for the best.
This is general information, not personalized investment advice. The example above uses a fixed 8% payout rate held flat for five years for clarity — real funds' payout rates can and do change over time. See the glossary for other terms used on this page, or run your own numbers on the Single Fund Calculator.