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How to Calculate How Much Risk You Can Actually Handle: Capacity vs. Tolerance
Key takeaways
- Risk tolerance is psychological — how well you handle watching your portfolio decline.
- Risk capacity is financial — how much you can afford to lose without jeopardising your goals.
- The resulting equity allocation should respect both components; the more restrictive one is the binding constraint.
- Historical drawdowns: the S&P 500 fell by 55% in 2008 and by 34% in 2020.
- Without knowing your own capacity and tolerance for risk, it is impossible to build a portfolio you will actually stick with.
How much risk you can handle depends on two independent components: tolerance (psychological ability to endure a drawdown) and capacity (financial ability to survive a loss without jeopardising your goals). You need to know both — the more restrictive one is the binding constraint.
Risk Tolerance: Can You Cope with −30%?
Risk tolerance is about emotions and behaviour. In a broker's questionnaire you'll write how you'd feel in a 20% decline. But theory and practice diverge. A better test: recall how you behaved in March 2020 or December 2022. Did you sell? Panic? Or buy more? Your answer is more accurate than any questionnaire.
Risk Capacity: Objective Numbers
- Time horizon — how many years until you need the money? A shorter horizon means lower capacity
- Income stability — employee vs. self-employed, job security
- Size of reserve — do you have 6 months of expenses outside the portfolio?
- Ratio of investments to total wealth — if the portfolio makes up 90% of your net worth, a 40% loss is a very different situation from an investor who also has real estate, a pension, and savings
From Numbers to a Portfolio
If you know that psychologically you can handle a 25% drawdown, but your capacity only allows −15% (short horizon, small reserve), the stricter constraint applies. A −15% maximum drawdown corresponds approximately to a portfolio with 30–40% in equities. More on translating these parameters into a concrete portfolio can be found in the article how to put together your first portfolio. A comparison of different allocation approaches is offered in the portfolio analyses section.
FAQ
What is risk tolerance?
The psychological ability to endure a decline in portfolio value without panic-selling. It is influenced by personality, past experience, and the length of the investment horizon. You will know it best from a real crisis, not a questionnaire.
What is risk capacity?
The financial ability to survive a loss without jeopardising life goals. It depends on the length of the horizon, income stability, the size of the reserve, and the share of investments in total net worth. It is an objective variable, unlike tolerance.
Which factor is more important — tolerance or capacity?
The more restrictive one is always binding. If you have high tolerance (psychologically you can handle −50%) but low capacity (you need the money in three years), you must adapt the portfolio to capacity — that is the objective constraint.
How large a drawdown does a 100% equity portfolio carry?
Historically, the S&P 500 fell by roughly 55% in 2008 and by 34% in 2020. A global portfolio has similar drawdowns. If these figures jeopardise your goals or would prompt you to sell, a 100% equity allocation is not right for you.