Investors have been trained to feel guilty about cash.
If money is sitting in the account, it is “doing nothing.”
If markets are rising, that cash feels even worse.
Every green day becomes evidence that you should have invested sooner.
So the natural response is to put the money somewhere.
Anywhere.
Because being fully invested feels productive.
But there is a problem with that logic.
Cash is not necessarily the absence of an investment decision.
Sometimes, cash is the investment decision.
Sometimes its job is to remain cash.
The first mistake is thinking every dollar needs immediate exposure
Most investors understand diversification.
They know different assets can perform different roles.
Equities may provide long-term growth.
Bonds may provide income or a different risk profile.
Real estate may provide another source of return.
But cash is often treated differently.
Instead of being viewed as a portfolio component, it is viewed as unfinished business.
That is too simplistic.
Cash has characteristics.
It has advantages.
It has costs.
And like every other allocation, its usefulness depends on why you own it.
Cash buys something most assets cannot: optionality
Imagine the market falls 20%.
Attractive companies become cheaper.
Valuations compress.
Opportunities that looked expensive six months earlier suddenly become interesting.
An investor with no available liquidity can analyze those opportunities perfectly.
But analysis is not capital.
An investor with cash has the ability to act.
That ability has value.
Optionality becomes most valuable when other investors lose it
Markets become interesting when conditions become uncomfortable.
Unfortunately, uncomfortable markets are often the exact moment when investors have the least flexibility.
Their portfolio is already fully invested.
Their risky assets are falling.
Their confidence is lower.
And they may need to sell one investment to buy another.
Cash changes that dynamic.
You do not need to liquidate an asset under pressure simply to create buying power.
You already have it.
Its value becomes obvious when opportunity appears and liquidity disappears.
Cash can reduce behavioural risk
Portfolio construction is not only about mathematical optimization.
It is also about building something you can actually live with.
Suppose two investors own identical equity portfolios.
Investor A has no liquidity outside the portfolio.
Investor B has enough cash to cover near-term needs and unexpected expenses.
The market falls 30%.
Financially, both investors experience the same decline in their equities.
Psychologically, they may experience a completely different event.
Investor A may begin wondering whether they will need to sell stocks while prices are depressed.
Investor B knows short-term obligations are already covered.
That difference can change decision quality.
The emergency fund and investment cash are not necessarily the same thing
This distinction matters.
Money reserved for near-term expenses is not speculative capital.
If you may need the money soon, its primary objective may be availability rather than maximizing return.
Investment cash is different.
It may be intentionally held inside a portfolio because the investor wants flexibility for rebalancing or future opportunities.
Combining the two mentally can create bad decisions.
An emergency reserve should not suddenly become a stock-market opportunity fund because equities fell 15%.
Capital should know its job.
Cash is also a volatility decision
Suppose you have a €100,000 portfolio.
If all €100,000 is invested in risky assets, the entire portfolio participates in those movements.
If €15,000 remains in cash, only €85,000 is exposed to market fluctuations.
That does not automatically make the second portfolio better.
But it does make it different.
The investor deliberately accepted lower market exposure in exchange for greater stability and flexibility.
That trade-off should be explicit.
There is no free protection
This is where the argument for cash often becomes dishonest.
Cash has benefits.
It also has costs.
If equities rise substantially while you hold a large cash allocation, your portfolio may underperform.
That is not necessarily evidence that holding cash was a mistake.
It is the price paid for having lower exposure.
Every form of protection costs something.
The most obvious cost is inflation
Cash is stable in nominal terms.
€10,000 generally still looks like €10,000 tomorrow.
But purchasing power is what ultimately matters.
If prices across the economy rise over time, the same amount of cash buys less.
This is why holding large quantities of cash indefinitely is not risk-free.
There may be almost no visible volatility on the account statement.
Yet real wealth can still erode.
Stability of price and preservation of purchasing power are not the same thing.
Then there is opportunity cost
Suppose markets compound strongly for several years.
An investor holding a large percentage of cash avoided volatility.
They also avoided part of the return.
That foregone return is an opportunity cost.
It is invisible because no number appears as a loss.
Your brokerage account does not display:
-$12,000 because you waited.
But economically, the difference can still matter.
The danger is when cash becomes an emotional hiding place
Cash can be strategic.
It can also become avoidance.
An investor sells during a market decline.
They move into cash.
They tell themselves they will invest again when conditions improve.
Then markets recover.
But now prices are higher.
So they wait for another pullback.
The pullback never becomes large enough.
Months pass.
Cash that began as temporary risk management becomes permanent hesitation.
“I’ll invest when things are clearer” is not a strategy
Markets rarely offer perfect clarity and attractive prices at the same time.
When uncertainty is high, prices may become attractive precisely because investors demand compensation for taking risk.
When uncertainty disappears, asset prices may already reflect the improved outlook.
Waiting for certainty can therefore create an impossible condition.
You want the opportunity.
But only after the uncertainty that created the opportunity has disappeared.
Cash needs an exit rule too
Investors usually think risk assets need rules.
When do I buy?
When do I sell?
What invalidates the thesis?
Cash deserves the same discipline.
Why are you holding it?
What event would cause you to deploy it?
What percentage are you willing to hold?
How long can that allocation remain above target?
Without answers, cash can quietly become a market-timing position you never intended to take.
There is a difference between strategic cash and accidental cash
Strategic cash
You know why it exists, how much you want, what role it plays and under what circumstances it may be deployed.
Accidental cash
Money accumulated because you sold positions, became uncertain, stopped making decisions or are waiting for a vague feeling of safety.
Both look identical on the account statement.
They are not the same portfolio decision.
Cash can be part of rebalancing
Imagine you have a target allocation across several asset classes.
Equities fall sharply.
Their weight in the portfolio decreases.
A cash allocation can be used to rebalance toward the target without requiring you to sell another asset.
This creates a systematic mechanism for buying lower prices.
The decision does not depend entirely on emotion.
The portfolio structure itself tells you what needs adjusting.
That is a much cleaner use of cash than simply waiting for the “perfect moment.”
The best use of cash may be preventing forced selling
Investors often focus on what cash allows them to buy.
But one of its most valuable functions may be what it prevents them from having to sell.
Unexpected expenses happen.
Income can change.
Personal circumstances can change.
Those events do not wait for markets to be convenient.
If you need liquidity during a major drawdown and every available dollar is invested, you may be forced to sell risky assets at an unattractive moment.
Liquidity reduces that risk.
Before deciding how much cash to hold, ask these 7 questions
- What near-term expenses must remain protected?
- How stable is my income?
- How much volatility can I genuinely tolerate?
- Does the portfolio need liquidity for rebalancing?
- Am I holding cash strategically or because I am afraid to invest?
- What conditions would cause me to deploy this cash?
- What is the cost of holding this amount for several years?
There is no universal “correct” cash percentage
A young investor with stable income, a long horizon and significant emergency reserves may rationally hold very little cash inside the investment portfolio.
Someone approaching a major planned expense may need significantly more liquidity.
An investor actively allocating across opportunities may choose another structure.
The right percentage depends on the job the portfolio needs to perform.
This is why copying someone else's cash allocation makes little sense.
Their obligations are not yours.
Their income is not yours.
Their tolerance for volatility is not yours.
Their opportunity set may not be yours either.
The real question is not “cash or stocks?”
Investors love binary debates.
Should I be in cash?
Or should I be invested?
But portfolio construction rarely requires that kind of all-or-nothing answer.
You can hold productive long-term assets and retain liquidity.
You can invest gradually.
You can rebalance.
You can define a cash target and let the rest of the portfolio do its job.
The goal is not maximum exposure.
The goal is an allocation that matches the objective.
Cash becomes dangerous when you stop measuring its cost
Cash feels safe because its cost is quiet.
A stock falling 20% gets your attention immediately.
Cash losing purchasing power gradually does not.
A portfolio missing years of market compounding does not create a red number.
Yet these outcomes can have a major long-term effect.
That is why cash should not receive special treatment simply because its risk is less visible.
Every allocation has to earn its place.
You should be able to explain every dollar of cash
Ask yourself:
Why is this money not invested?
If the answer is:
I need it in twelve months.
Clear.
It is part of my emergency reserve.
Clear.
It is a deliberate 10% portfolio allocation for liquidity and rebalancing.
Clear.
But if the answer is:
I’m waiting to see what happens.
You may not have a cash strategy.
You may have indecision.
Cash is a tool. Treat it like one.
Cash is not automatically conservative.
It is not automatically wasteful.
It is not automatically smart before a crash.
And it is not automatically stupid during a bull market.
Its value depends on what problem it is solving.
Liquidity.
Stability.
Optionality.
Rebalancing.
Near-term spending.
Those are legitimate jobs.
Fear without a plan is not.
Know why you hold it.
Know what it costs.
Know what would make you use it.
Then cash stops being “money doing nothing.”
It becomes another deliberate part of the portfolio.
Every allocation needs a purpose
Better portfolio decisions begin when equities, bonds, cash and every other position are judged by the role they are supposed to play.
EXPLORE YOANN MARKETS →Educational content only. Nothing in this article constitutes financial, investment or trading advice. Investing involves risk, including the potential loss of capital. Cash and cash-equivalent products may also be exposed to inflation, interest-rate, credit or currency risks depending on the instrument used.