Risk and return: why higher gains come with bigger swings

In investing, risk means uncertainty: the chance that the result is different from what you hoped, including the chance of losing money. Return is what an investment earns or loses, through price changes plus any interest or dividends. The two are linked, and understanding how is one of the most useful ideas in investing.

The trade-off

Investors want to be paid for uncertainty. A bank deposit pays modest interest because there is little doubt you will get your money back. A company’s shares can rise a lot or fall a lot, so investors only buy them if they expect a higher return on average to make up for that uncertainty.

That gives the basic risk-return trade-off: investments with higher potential returns usually come with bigger swings and a greater chance of losses. The reverse does not hold, though. Taking more risk does not guarantee more return; it only makes a wider range of outcomes possible, good and bad.

Typical risk level	Examples	What tends to happen
Lower	Bank deposits, short-term government bonds	Small, steady returns; may not keep up with inflation
Medium	Longer-term and company bonds, mixed funds	Prices move with interest rates and the economy
Higher	Broad share funds	Larger long-term growth potential; falls of a third or more have happened
Highest	Single shares, crypto, leveraged products	Can lose most or all of the money invested

This is a general picture, not a rule for every product.

Volatility: how much prices swing

Volatility measures how much an investment’s price moves up and down. A savings account barely moves; a broad share fund can rise or fall by a percent or more in a single day, and much more over a year; a single small company can move far more than that. Volatility is not loss in itself (prices can come back), but it shows how bumpy the ride is and how far the value can be from where you expect it when you need the money.

Drawdowns: the fall from the top

A drawdown is the fall from a previous high to a low point, measured in percent. It is the number that tells you how bad things got. Drawdowns are harder to recover from than they look, because the recovery starts from a smaller base:

• A fall of 20% needs a rise of 25% to get back to where it started.
• A fall of 30% needs a rise of about 43%.
• A fall of 50% needs a rise of 100%.

Time horizon

Your time horizon is how long the money can stay invested before you need it. It matters because short-term swings have less time to even out over a few months than over many years. Money needed next year is exposed to whatever the market does next year. Over longer periods, broad share markets have historically gone up more than down, but long periods of poor returns have also happened, and the past does not guarantee the future. See bull and bear markets.

The KID risk score (SRI 1–7)

In the EU, packaged investments sold to the public, including funds and ETFs, must come with a KID (Key Information Document). In its section on risks, the KID shows a summary risk indicator (SRI): a score from 1 (lower risk) to 7 (higher risk).

The SRI combines market risk (how much the price has tended to swing) and credit risk (the chance the company behind the product can’t pay you).

The score is worked out for the product’s recommended holding period, which the KID also states. If you sell earlier, the risk can be higher than the score suggests. And a 1 means lower risk, not no risk. The SRI is useful for comparing products side by side; whether a given level suits your situation is a question for a regulated adviser.