Investing in a Down Market: What ETFs Do Right

The instinct is wrong

When markets fall, selling feels rational. You are stopping the bleeding. You are protecting what you have left. You will buy back in when things stabilize.

The problem is the last part. "When things stabilize" almost never comes with a clear signal. Markets do not ring a bell at the bottom. By the time the news is good enough to feel safe, the recovery has already happened. The investors who "waited for clarity" in March 2020 watched the market recover 80% from its low before they felt comfortable getting back in — which means many of them bought back at prices higher than where they sold.

This is not a fringe outcome. JP Morgan Asset Management has tracked the cost of missing the market's best days for decades. Missing the 10 best trading days over a 20-year period cuts returns roughly in half. Six of the best 10 days in the past two decades occurred within two weeks of the 10 worst days. You cannot be out of the market during the bad days and in for the good ones. They are almost the same days.

What ETFs do differently in a down market

The structure of an ETF matters when markets get disorderly. Three features work in your favor:

No forced selling

Actively managed mutual funds face redemption pressure during market downturns. When investors panic and redeem shares, the fund manager must sell holdings to raise cash — often at the worst possible time, and often in the stocks that have fallen the most. ETFs do not work this way. When you sell an ETF, you sell to another investor on the exchange. The fund itself does not have to liquidate positions. This insulates the underlying portfolio from redemption-driven fire sales.

Cost drag disappears at low expense ratios

VTI charges 0.03%. In a flat market, that is $30 per year on $100,000. In a down market, where every basis point of return counts, keeping costs at minimum matters more. Compare that to an actively managed fund at 0.75% — in a year where the market returns -15%, the active fund costs you -15.75%. The extra 0.72% is a guaranteed loss on top of the market loss. The math on expense ratios is always working against you, but down markets make it more visible.

Tax-loss harvesting opportunity

Down markets create a specific tax benefit in taxable brokerage accounts. If you bought VTI at $220 and it is now trading at $185, you can sell it, realize a $35/share capital loss, and immediately buy a similar-but-not-identical fund (like ITOT, the iShares equivalent) to maintain market exposure. The IRS wash-sale rule prohibits buying the same security within 30 days, but ITOT and VTI track different indexes, so the swap is clean. You have harvested a tax loss worth potentially hundreds of dollars per $10,000 invested, while staying fully invested in the market. This loss offsets future capital gains.

Dollar-cost averaging: the bear market advantage

If you are contributing regularly to a 401(k) or setting up auto-invest in a brokerage account, a falling market is literally making your future contributions cheaper. Each monthly contribution buys more shares of VTI at $180 than it did at $220. When the market recovers, those extra shares all appreciate.

This is not a theoretical benefit. During the 2008-2009 financial crisis, an investor who continued contributing $500/month to an S&P 500 index fund throughout the decline — including the worst months of October 2008 and March 2009 — accumulated significantly more shares at suppressed prices. By 2013, their portfolio had outperformed an investor who paused contributions during the panic and resumed when things felt safer.

What actually goes wrong in a down market

The mistakes investors make in down markets are consistent across every cycle:

Selling and waiting for "the bottom"

No one has reliably predicted market bottoms across multiple cycles. The language around "waiting for the bottom" implies it will be visible when it arrives. It never is. The news is worst at the bottom. The bottom in March 2009 looked, at the time, like the beginning of further decline. Same for March 2020. The signal to buy back in does not exist.

Moving to cash in a Roth IRA

Moving to cash inside a tax-advantaged account during a downturn is particularly costly because you lose both the market recovery and the tax-sheltered compounding of that recovery. If you are in a Roth IRA, every dollar of recovery your investments capture is permanently tax-free. Selling to cash forfeits that.

Switching to "safer" but expensive funds

Rotating into actively managed funds during downturns, on the premise that active managers can navigate volatility better than index funds, has not proven reliable. SPIVA data consistently shows that fewer than 10% of actively managed large-cap US funds outperform their benchmark index over 15 years — and there is no reliable way to identify which 10% will outperform in advance. Paying 0.75%+ for a fund that will likely underperform is a worse outcome than staying in VTI at 0.03%.

Rebalancing during a downturn

If you hold a portfolio with a target allocation — say, 80% equities and 20% bonds — a significant equity decline shifts your actual allocation below target. A 35% equity decline in an 80/20 portfolio produces something closer to 70/30. Rebalancing back to 80/20 means buying more equities at depressed prices and selling bonds at relative highs. This is forced, systematic buying low — the thing most investors claim to want but fail to execute during the moments it matters.

Rebalancing annually or when allocation drifts more than 5-10 percentage points from target is the most straightforward approach. In a taxable account, use new contributions to buy the underweight asset rather than selling the overweight one. This avoids triggering capital gains while still moving toward target allocation. In a Roth IRA or 401(k), there are no tax consequences to rebalancing, so selling and buying freely to restore target weights is clean.