What is risk tolerance?

Risk tolerance is the degree of investment loss and volatility an investor is willing and able to accept. It has two sides that are often confused:

Willingness to take risk: the psychological ability to live with falling values without selling in panic.
Capacity to take risk: the financial ability to absorb losses without endangering one's goals, determined by income, savings, horizon and obligations.

A sound portfolio respects the lower of the two. A young investor with a secure income may have a high capacity but a low willingness; a relaxed retiree whose pension covers all expenses may be the opposite.

How it is assessed

Questionnaires used by banks and advisers ask about goals, experience and reactions to hypothetical losses. The most useful questions are concrete: what would happen at a loss of €20,000 on a €100,000 portfolio?

Past behaviour is often more telling than any answer: how the investor actually reacted in the last real downturn.

The maximum acceptable drawdown is a practical way to turn tolerance into an allocation. If the worst tolerable fall is $D_{\max}$ , and stocks can lose about half their value in a severe crisis while high-quality bonds lose much less, the maximum share of stocks is roughly:

w_{\text{stocks}} \approx \frac{D_{\max}}{50\%}

A simple illustration

An investor with €100,000 decides they could bear a temporary loss of €20,000 — 20% — without selling:

w_{\text{stocks}} \approx \frac{20\%}{50\%} = 40\%

A portfolio of about 40% stocks and 60% high-quality bonds and cash would, in a crisis like the worst of recent decades, be expected to fall by roughly that much. An investor who could bear a 35% fall could hold about 70% stocks.

This is only a rough rule: bonds can fall too, as they did in 2022, and future crises can be deeper than past ones.

How it shapes the allocation

Asset allocation — above all the split between stocks and safer assets — is where risk tolerance becomes concrete.
Volatility and maximum drawdown of the resulting portfolio should match what the investor has said they can bear.
Consistency matters more than precision. The best allocation is one that is held through a crash; a slightly lower return that is actually earned beats a higher one abandoned at the worst moment.

Things to keep in mind

Tolerance changes with age, circumstances and experience, and often drops sharply after the first real loss.
Calm markets flatter it. Many investors overestimate their tolerance after years of rising prices.
Writing it down helps, so that a decision made in calm times can guide the one taken in a crisis.

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