What Do Positive and Negative Investment Returns Mean?
An investment return describes how an investment changed over a particular period. If its value increased, the change produces a positive return. If its value decreased, it produces a negative return.
Suppose two investments both start at £10,000. One rises to £10,800, while the other falls to £9,200. Both have changed by £800, but in opposite directions.
Positive Investment Return
£10,000 → £10,800. The investment has gained £800. Relative to the £10,000 starting value, this represents a positive return of 8%, which may be written as +8%.
Negative Investment Return
£10,000 → £9,200. The investment has lost £800. Relative to the £10,000 starting value, this represents a negative return of 8%, written as −8%.
The size of the change is the same in both examples. The sign shows its direction: a positive return represents a gain, while a negative return represents a loss.
There is also a third possibility. If an investment starts at £10,000 and finishes the measured period at £10,000, the change in its value is £0, giving a simple return from the change in value of 0%.
However, an unchanged investment value does not necessarily mean the investor’s total return was zero. Some investments produce income, such as dividends or interest, which can contribute to the overall return even if the investment’s market value finishes the period unchanged.
For example, if an investment remains worth £10,000 but produces £300 of income during the period, there has been no capital growth, but the income may still contribute to its total return. What Is Total Return? explains how changes in investment value and investment income can be considered together.
The meaning of a positive, negative or zero return therefore depends on what the return being quoted actually measures.
Investment Returns in Pounds and Percentages
A gain or loss can be described as a monetary amount or as a percentage. The two figures provide different information.
The monetary amount tells you how much money was gained or lost. The percentage tells you how large that change was relative to the investment’s starting value.
The same principle applies to losses. Losing £500 from a £5,000 investment represents a much larger percentage loss than losing £500 from £50,000.
This is why percentage returns are particularly useful when interpreting investment performance. They allow gains and losses to be considered relative to the amount involved rather than looking only at the number of pounds gained or lost.
How Are Positive and Negative Returns Calculated?
Positive and negative returns can be calculated using the same basic formula:
Investment return = (Ending value − Starting value) ÷ Starting value × 100
If £10,000 grows to £10,800:
(£10,800 − £10,000) ÷ £10,000 × 100 = +8%
The ending value is higher than the starting value, so the result is positive.
If £10,000 instead falls to £9,200:
(£9,200 − £10,000) ÷ £10,000 × 100 = −8%
The formula has not changed. The result is negative because the ending value is lower than the starting value.
This is a simplified calculation based on a change in investment value. Real return calculations can require additional factors to be considered, particularly where an investment produces income or money is added or withdrawn during the period. How Are Investment Returns Calculated? explains these calculations in more detail.
If you know the starting and ending values for a period, the Investment Return Calculator can calculate the percentage gain or loss directly.
Why Don’t Equal Percentage Gains and Losses Cancel Out?
One of the most important features of percentage returns is that an equal percentage loss and gain do not normally cancel each other out.
It can seem logical that a 20% loss followed by a 20% gain should return an investment to where it started. The problem is that the second percentage is applied to a different amount.
Each percentage change is applied to the investment value at that point in time, so the amount used for the second calculation has already changed. The investment remains £400 below its original value. Once the balance has fallen to £8,000, a 20% gain is smaller in pounds than the preceding 20% loss because it is calculated from a smaller starting value.Why a 20% Loss and 20% Gain Do Not Cancel Out
Starting value
After a 20% loss
After a 20% gain
Returning from £8,000 to £10,000 requires a gain of £2,000.
But £2,000 now represents 25% of £8,000:
£2,000 ÷ £8,000 × 100 = 25%
A 20% loss therefore requires a 25% gain to recover.
This is not a special feature of a 20% loss. The same mathematical relationship applies whenever an investment loses a percentage of its value.
How Much Does an Investment Need to Gain to Recover From a Loss?
The percentage gain required to recover increases as the size of the loss becomes larger.
Each example below assumes an investment starts at £10,000.
| Loss | Value after loss | Gain needed to recover |
|---|---|---|
| 10% | £9,000 | 11.1% |
| 20% | £8,000 | 25% |
| 30% | £7,000 | 42.9% |
| 50% | £5,000 | 100% |
After a 10% loss, £9,000 remains. Returning to £10,000 requires a £1,000 gain, which is approximately 11.1% of £9,000.
After a 30% loss, only £7,000 remains. Recovering the £3,000 that was lost requires the remaining £7,000 to increase by approximately 42.9%.
The relationship becomes particularly clear with a 50% loss. If £10,000 falls to £5,000, the remaining £5,000 needs to double — a 100% gain — to return to £10,000.
This does not mean an investment that falls will necessarily recover, nor does the calculation tell you how long any recovery could take. It demonstrates only the mathematical relationship between a percentage loss and the percentage gain subsequently required to return to the previous value.
The deeper the loss, the larger the percentage increase required to recover because that increase begins from a smaller investment value.
Can Returns Be Positive and Negative Over Time?
An investment can produce positive returns during some periods and negative returns during others.
For example:
Year 1: +8%
Year 2: −5%
Year 3: +11%
These are three separate returns covering three separate periods.
They should not simply be added together to calculate the investment’s overall three-year return. Each percentage acts on the investment value carried forward from the previous period.
If £10,000 gains 8% during Year 1, it becomes worth £10,800.
A 5% loss during Year 2 is then calculated from £10,800, reducing the value to £10,260.
An 11% gain during Year 3 would subsequently be calculated from £10,260, taking the investment to £11,388.60.
The investment has therefore experienced both positive and negative annual returns while finishing the three-year period above its original value.
This is why the period being measured matters when interpreting any return. A negative return during one year does not necessarily mean an investment has lost value over a longer period, while a positive year does not by itself tell you how the investment performed across several years.
Why Investment Returns Change From Year to Year explains why returns can vary between periods. For longer periods, What Is an Annualised Return? explains how an overall multi-year result can be expressed as an equivalent yearly rate.
What Does a Negative Return Actually Tell You?
A negative return tells you that an investment lost value over the particular period being measured.
That is useful information, but its meaning should not be extended beyond what the figure actually shows.
For example, a negative one-year return does not by itself tell you how the investment performed over five or ten years. An investment could experience a loss during one period while remaining above its value at the beginning of a longer period.
A negative return also does not, on its own, establish whether an investment is suitable or what will happen to its value next. Those questions involve wider considerations than the sign of one historical return.
The same caution applies to positive returns. A gain during a particular period records what happened during that period; it is not evidence that the investment is low risk or that further gains will follow.
What Is Investment Risk? explains the uncertainty involved in investment outcomes more broadly, while Why Past Performance Does Not Guarantee Future Returns explains why previous gains or losses should not be treated as predictions of subsequent performance.
Positive and negative returns are therefore best understood as measurements of investment performance over defined periods, rather than judgements about whether an investment is good or bad.
Conclusion
Positive and negative investment returns describe the direction and size of a change over a particular period.
A positive return represents a gain, while a negative return represents a loss. A 0% change in investment value means the ending value is the same as the starting value, although investment income may still need to be considered when measuring total return.
Expressing returns as percentages also puts gains and losses into context. A £500 change can represent a very different return depending on whether the investment started at £5,000 or £50,000.
The mathematics becomes particularly important when returns occur one after another. Each percentage acts on the investment value at that point in time, so equal percentage gains and losses do not cancel each other out.
A 20% loss followed by a 20% gain, for example, leaves an investment below where it started. Recovering from the 20% loss requires a 25% gain because the recovery begins from the smaller remaining balance.
Understanding that relationship makes positive and negative returns easier to interpret: the sign tells you whether value increased or decreased, while the percentage tells you the size of that change relative to the value from which it began.
