What a household can absorb and what it can tolerate are two separate measurements

Three questions that get compressed into one

Ask how much risk somebody should take and the answer usually arrives as a single word — cautious, balanced, adventurous — that conceals three quite different questions. What could this household withstand? What would it be willing to endure? And what does its plan actually need?

These are answered by different means. The first is arithmetic about circumstances. The second is a judgement about temperament and experience. The third comes out of a goal, a horizon and a required amount.

The reason regulated advice separates them is that they frequently disagree, and the disagreement is the useful part. A household able to withstand a great deal may be unwilling to; one willing to take a great deal may not be able to afford the consequences.

Capacity is about consequences, not feelings

Capacity for loss asks what would actually happen to the household if the money fell substantially in value and stayed there for a while. Would a planned expense become impossible? Would something have to be sold? Would the household still be able to meet its commitments?

It depends on things that can be listed: the horizon, whether there is other money, how stable the income is, whether the money has a fixed job on a fixed date, and how large this holding is relative to everything else.

A household with a long horizon, a reserve in cash and no specific plan for the money has considerable capacity almost regardless of how it feels. One relying on the money in two years for a defined purpose has very little, no matter how relaxed it is about markets.

Capacity also moves over time without anybody revisiting it. A household whose circumstances have changed — a new commitment, a less certain income, a date that has come closer — may be carrying an arrangement chosen when the answer to this question was quite different.

Tolerance is real, and it is measured by behaviour

Tolerance is the amount of movement a person can watch without acting on it, and it matters for a practical reason rather than a sentimental one. Selling during a fall converts a temporary decline into a permanent one, so an approach a household cannot stay with is worse than a more modest one it can.

The awkwardness is that stated tolerance and actual tolerance differ. It is easy to describe oneself as comfortable with a large decline in the abstract and much harder to hold the position when the balance is visibly lower every week.

The best available evidence is behaviour rather than a questionnaire: what did this household do the last time values fell? Somebody who has been through a poor period and stayed put knows something about themselves that no self-assessment can supply.

Tolerance is also not fixed. It tends to be higher after a long calm stretch and lower after a difficult one, which is unhelpful, because that pattern encourages taking more risk when prices have already risen and less after they have fallen.

The plan has a required risk, and it is often ignored

The third question is what the goal itself demands. If a household needs a certain amount by a certain date, and the amount it can set aside will not get there without growth, then a very cautious approach carries its own risk — the risk of falling short.

That shortfall risk is invisible day to day, which is exactly why it gets ignored. Nothing about a stable balance signals a problem, and the problem only becomes apparent at the end, when there is no time left to address it.

The honest response is not to take more risk to close the gap. It is to notice that the gap exists and to consider the other variables: saving more, extending the deadline, or reducing the target. Increasing risk to reach a required number is the response most likely to produce the worst outcome.

When the three answers disagree

Where capacity, tolerance and requirement point to different places, the conventional resolution is that the lowest of them governs, since a household should not take more risk than it can withstand or more than it can live with, whatever the plan appears to require.

That resolution is uncomfortable because it often means confronting the fact that a goal is not reachable on the current terms. It is nonetheless considerably better to discover that at the beginning than at the end.

None of these three questions can be answered from a general article, because all of them depend on the specifics of a household’s position. They are, however, exactly the questions a regulated adviser is required to work through, and knowing that they are separate makes that conversation a great deal more productive.