How to stay invested when the market drops

By . Published 2026-10-17. Figures checked against Vanguard's 2023 cost-averaging paper and Morningstar's Mind the Gap 2026.

Part 1

Money waiting on the sidelines usually loses

  • Lump sum beat spreading it out about 68% of the time. Vanguard tested investing a pile of cash at once against feeding it in over months, across markets from 1976 to 2022 [1]. Markets go up more often than down, so waiting usually costs you.
  • Your paycheck is a small lump sum. Investing each one as it arrives follows the same rule. That's all "automating it" means.
  • Daily vs. per paycheck barely matters. Pick whatever your broker makes easiest. My original guide said daily because $20 a day felt smaller than $600 a month, and that's the only real reason.

Part 2

Drops are normal, and selling is what makes them permanent

Do this first

  1. Decide now what you'll do in a 30% drop: nothing.
  2. Turn off price alerts and delete the app from your home screen.
  3. Keep your emergency fund in cash, so you never have to sell to pay a bill.
  • Missing the 10 best days in 20 years cut returns almost in half, in J.P. Morgan's 2025 retirement guide [2]. Most of those days came within weeks of the worst ones, so the people who sold to wait it out missed them.
  • A 25% loss needs a 33% gain to get back. A 50% loss needs 100%. That's arithmetic, and it's why you don't want to sell at the bottom and buy back higher.
  • The market has always come back so far. The S&P 500 recovered from 2008 and from the 2020 crash. History doesn't promise it, but every long-term plan here assumes you hold.

Part 3

The average investor earns less than their own funds

  • 1.2 points a year, gone to timing. Funds returned 9.9% a year over the 10 years to 2025. The average dollar in them earned 8.7%, because people bought after gains and sold after losses [3].
  • The busiest traders did worst. In 66,465 brokerage households, the 20% who traded most earned 11.4% a year against 17.9% for the market [4].
  • Simple portfolios had the smallest gaps. Morningstar has found all-in-one funds close the gap more than anything else [3]. Fewer decisions, fewer mistakes.

Part 4

Check once a year, and let new money do the rebalancing

Do this first

  1. Pick a date, say your birthday, to look at your accounts.
  2. If a fund is more than 5 points off its target, point new contributions at whatever's under.
  3. Only sell to rebalance inside a retirement account, where it isn't taxed.
  • Once a year is enough. Rebalancing more often adds trades without adding return, in Vanguard's research. New contributions do most of the work for free.
  • A target-date fund does it for you. If your 401(k) offers one at a low cost, it rebalances itself.

Sources

  1. Megan Finlay and Josef Zorn, Vanguard, Cost averaging: Invest now or temporarily hold your cash?, 2023. Vanguard sells funds.
  2. J.P. Morgan Asset Management, 2025 Guide to Retirement.
  3. Morningstar, Mind the Gap 2026, 10 years to 2025-12-31.
  4. Brad Barber and Terrance Odean, "Trading Is Hazardous to Your Wealth," Journal of Finance, 2000.