Finding the Level of Risk You Can Live With

Choosing how much of your money to hold in stocks is the single decision that most shapes both your long-run return and how bad your worst year feels. Set it too low and your money may grow too slowly to reach your goals. Set it too high and the first deep fall may scare you into selling at the bottom, which is worse than either choice made calmly. This chapter shows how to judge the risk you can afford, the risk you can stomach, what losses look like in real money, and what safety costs over a lifetime.

Two kinds of risk tolerance

Risk tolerance has two parts, and they often disagree.

Risk capacity is your financial ability to absorb a loss without changing your life. It is mostly objective. It is higher when the money will not be needed for many years, when your income is steady, when you have a cash reserve so you never have to sell investments to pay a bill, when you have few people depending on you, and when this money is a small part of your total wealth, including any pension or Social Security you will receive.

Risk willingness is how you feel and act when prices fall. It shows up in how often you check your balance, whether losses keep you awake, and, most honestly, in what you actually did the last time markets dropped.

A common guide is to set your stock share by the lower of the two. Someone with decades ahead and a secure job has high capacity, but if they would sell in a panic after a 30% fall, a portfolio built only on capacity will fail them at the worst moment. A plan you can stick with beats a better plan you abandon.

Time horizon changes the odds

The longer money can stay invested, the less any single bad year decides the outcome. The US record from 1928 to 2025 shows how the odds of a loss shrink with time for large-company stocks.

• In single calendar years, stocks lost money in 26 of 98 years.
• Over rolling 10-year periods, they lost money overall in 5 of 89.
• Over rolling 20-year periods, they lost money in 0 of 79.

That pattern is why money needed within a few years usually belongs in cash or short-term bonds, and money for goals decades away can hold more stocks. It is one country's history, and other markets have had much longer losing stretches, so it describes the odds, not a guarantee. These are also year-end figures, so falls within a year were deeper than they show.

What a loss looks like in real money

Percentages feel abstract until they are applied to your own balance. Here is a portfolio of $100,000 in two bad years.

The all-stock portfolio ends at $50,000. The 60/40 portfolio, where only 60% of the money takes the 50% hit, ends at $70,000. A fall of that size is not hypothetical. From the end of 1928 to the end of 1932, US large-company stocks fell 64.77% from peak to low, while a mix of 60% stocks and 40% Treasuries fell 40.06%. In 2008, stocks returned -36.55% and the 60/40 mix -13.89%.

A useful test is to picture the larger of those two losses on your own statement and ask what you would do. If the honest answer is "sell", the stock share is too high for you today, however good it looks on paper.

What safety costs

Holding less in stocks lowers the depth of the bad years, and it also lowers the long-run growth. Here is the same monthly saving over thirty years at the historical average return of each mix after inflation, so the results are in today's dollars.

Both put in $180,000. The all-stock path ends near $561,548 and the 60/40 path near $418,623. The gap is the long-run price of a smoother ride. Neither choice is wrong: the right one is the one you will actually hold through a fall like 2008, because a portfolio sold at the bottom earns neither result. Over 1928 to 2025 the 60/40 mix returned 8.34% a year before inflation, against 10.02% for stocks alone.

A quick self-check

There is no precise formula, but four questions cover most of what matters. Answer them for how you would actually behave, not how you think you should.

1. If your investments fell by 30% over a few months, what would you do? Sell everything, sell some, hold, or buy more. Your past behaviour in a real fall is better evidence than your prediction.
2. When will you need most of this money? Within three years, three to seven, seven to fifteen, or more than fifteen.
3. How stable is your income? Commission or gig income with no reserve leaves less room for investment losses than a steady salary with several months of expenses in cash.
4. How much do you know about how markets behave? Experience of a full fall and recovery tends to make a plan easier to keep.

Answers towards the first options point to a lower stock share; answers towards the last point to a higher one. Published rules of thumb give a starting point: "110 minus your age" in stocks is one, with versions using 100 or 120. Target-date funds follow a glide path; one large provider's funds hold about 90% stocks until roughly 25 years before the target date and about 50% at it. These are defaults, not answers. Your capacity and your honest answer to question 1 should move you up or down from them.

Write it down

Once you choose a mix, write it down in one or two sentences: the stock and bond shares, why you chose them, and what you will do when markets fall, for example "keep contributing and rebalance once a year". Professionals call this an investment policy statement. Its value is that it is written when you are calm and read when you are not. Review it after a major life change, such as a new job, a child, an inheritance or retirement approaching, rather than after a market move.