Waiting for a Market Crash: A Better Way to Decide When to Invest

Waiting for a major market fall can feel prudent. If shares look expensive or have risen strongly, holding cash until prices become more attractive seems like a sensible way to reduce risk.

The difficulty is that this approach requires several decisions to go right. An investor must identify when the market is too expensive, remain patient while it moves without them, recognise the eventual opportunity and then have the confidence to buy while the news is frightening.

That is much harder than simply predicting that markets will fall at some point.

Why waiting for a crash feels sensible

Losses tend to feel more painful than equivalent gains feel rewarding. This can make the possibility of investing immediately before a downturn seem worse than the possibility of missing further growth.

Cash also provides emotional comfort. Its value does not jump around on a screen each day, and it gives the holder a sense of control. An investor can tell themselves they are ready to act when the right opportunity appears.

There is nothing inherently wrong with holding cash. It may be appropriate for emergencies, near-term spending or money that cannot tolerate market volatility. The problem arises when long-term investment capital remains uninvested because the investor is waiting for a precise market event.

The perfect entry point may never arrive in the expected form. Alternatively, prices may fall but still remain above the level at which the investor first decided to wait.

Market timing involves two decisions

Selling or delaying an investment is only the first half of a market-timing strategy. The second half is deciding when to enter.

A falling market rarely sends a clear signal that the bottom has arrived. A decline of 10% can become 20%. A short recovery can reverse. Economic headlines may continue to deteriorate even after share prices have started recovering.

This creates a common behavioural trap. The investor who was uncomfortable buying during calm conditions may become even less comfortable after a sharp fall. Instead of purchasing cheaper assets, they wait for greater certainty.

By the time conditions feel safe again, prices may already have moved higher.

A useful question is therefore not, "Will the market fall?" Markets will experience setbacks over a sufficiently long period. The better question is, "What rules will I follow if it does?"

Be careful with "cash on the sidelines"

Large estimates of money waiting outside the stock market can sound reassuring. They may suggest that any decline will be quickly met by eager buyers.

However, the phrase can be misleading.

Cash does not disappear when somebody buys shares. It usually moves from the buyer to the seller. Money held in savings accounts, money market instruments or institutional portfolios may also have purposes unrelated to buying equities.

Some of it supports day-to-day spending, business operations, liabilities or planned purchases. Some investors may prefer the risk profile of cash regardless of what share prices do. Headline totals therefore do not tell us how much capital will enter the market at a particular valuation.

Nor does potential buying power place a firm floor beneath prices. Buyers can change their minds, demand lower prices or become more cautious as conditions worsen.

Rather than relying on a large, uncertain pool of supposed dry powder, investors can focus on factors within their control.

Three practical approaches to entry timing

There is no single method that removes uncertainty, but three broad approaches can make the decision more manageable.

1. Invest according to the long-term plan

An investor with a long time horizon might invest available long-term capital once their emergency savings and near-term needs are covered.

This maximises time in the market, but it also creates immediate exposure to a possible decline. The approach is easier to tolerate when the portfolio is diversified and the investor accepts in advance that short-term losses are possible.

2. Phase the money in

Regular investing divides the decision across several dates. For example, an investor could allocate a fixed amount at set intervals rather than committing everything on one day.

This can reduce the emotional importance of the initial entry point. If prices fall, later contributions buy at lower levels. If prices rise, some money is already invested.

The trade-off is that part of the capital remains in cash during the phasing period. If markets continue rising, the phased approach may produce a lower outcome than investing immediately.

3. Use predetermined allocation rules

Some investors set a target split between equities, bonds and cash, then rebalance when market movements push the portfolio away from those weights.

This replaces predictions with a process. A fall in equities may cause their portfolio weight to decline, creating a rule-based reason to add to them. A strong rise may lead the investor to trim exposure rather than chase performance.

The right allocation depends on time horizon, financial capacity and tolerance for losses. The important point is to establish the rules before emotions are running high.

For a broader introduction to building an investment process, see my UK investing guide.

Diversification matters more than finding the bottom

Entry timing attracts attention because it appears to offer a simple route to better returns. Yet portfolio construction may have a greater influence on whether an investor can stick with their plan.

A concentrated portfolio can suffer heavily if one company, industry or country runs into difficulty. Diversification spreads that exposure across different holdings, although it cannot prevent losses across the wider market.

Investors should consider:

• Whether one company or sector dominates the portfolio
• Whether they rely too heavily on a single country or currency
• Whether the portfolio's volatility matches their genuine tolerance for losses
• Whether money needed within the next few years is exposed to equity risk
• Whether they have enough accessible cash to avoid selling investments during an emergency

A portfolio that looks impressive in a spreadsheet is not useful if its owner abandons it during the first severe decline.

Write a plan for difficult markets

A short written policy can reduce the temptation to make improvised decisions. It might include the portfolio's purpose, target asset allocation, contribution schedule and rebalancing rules.

It can also specify what will not trigger a change. Headlines, round-number index levels and confident crash predictions are not necessarily reasons to abandon a long-term strategy.

Investors should still review genuine changes in their own circumstances. A shorter time horizon, reduced income or an approaching major expense may justify lowering risk. That is financial planning, not an attempt to predict next month's market direction.

The bottom line

Waiting for a crash feels safer because it postpones the possibility of regret. But it can replace investment risk with a different risk: remaining uninvested while prices move higher, then lacking the confidence to buy when they finally fall.

Long-term investors do not need to identify the exact bottom. They need an approach that recognises uncertainty and remains workable in both rising and falling markets.

That may mean investing according to a diversified long-term allocation, phasing money in on fixed dates or using rebalancing rules. None guarantees a profit or prevents losses. Each is simply a way to make decisions without relying on an unknowable forecast.

The goal is not to make every entry point look clever in hindsight. It is to build a process you can continue following when the market becomes uncomfortable.