What DRIP actually does, with real numbers
DRIP — dividend reinvestment — means every dividend payment immediately buys more shares. Those shares pay their own dividends, which buy more shares. It's compounding's most concrete form, and it's easy to underestimate because each individual reinvestment looks tiny.
A real example: Coca-Cola, 2011–2026
We backtested $10,000 of KO from August 2011 through July 2026 twice — identical except for one switch:
| DRIP on | DRIP off | |
|---|---|---|
| End value (incl. cash) | $37,265 | $30,128 |
| Dividends as cash | $0 (reinvested) | $6,573 |
| Return / yr | 9.2% | 7.7% |
Same stock, same window, same dividends declared — but reinvesting them produced about 24% more total wealth. The gap comes entirely from the reinvested payments buying shares that then paid and grew themselves. And the longer the window, the wider that gap gets: this effect is roughly exponential in time.
When taking the cash makes sense
DRIP isn't a law. Taking dividends as cash is reasonable when you're living off the income, when you'd rather steer the cash to whichever holding is cheap (a form of manual rebalancing), or when reinvesting would keep piling into an overweight position. The mistake isn't choosing cash — it's choosing cash while assuming you're still getting the compounded outcome.