How Do Investment Fees Reduce Your Returns?
Investment fees are charges associated with holding, managing or using an investment. Depending on the investment and service, these might include fund charges, platform fees, management charges or transaction costs.
For long-term investment growth, the important principle is straightforward:
Money paid in fees is money that is no longer part of your investment.
This can affect your investment in two ways.
First, the charge itself reduces the amount of money you keep. Second, money removed from an investment to meet a charge is no longer available to participate in any future investment growth.
That second effect can become increasingly important over long periods.
Imagine two hypothetical investments experiencing exactly the same growth before charges. If one has higher ongoing costs, it will generally have less money remaining invested after those charges are deducted. If positive returns subsequently occur, they are then being generated from a smaller investment balance.
As that process repeats, an apparently modest difference in annual costs can contribute to a much larger difference in eventual investment value.
This is closely connected to investment growth and compounding. However, it is important not to assume that every real investment fee can simply be subtracted from an investment return. Different charges can be calculated and deducted in different ways.
The underlying principle remains the same: investment costs reduce the amount of value available to participate in future returns.
Why Can Small Fees Make a Bigger Difference Over Time?
The effect of an investment fee is not necessarily limited to the amount deducted when the charge is made.
Suppose £100 leaves an investment to meet a fee.
The immediate cost is £100. But if that £100 would otherwise have remained invested, it also loses the opportunity to participate in any positive returns that occur afterwards.
If positive growth continues for many years, the difference can build.
This means time can work in two directions. More time can give positive investment growth greater opportunity to compound, but recurring charges also have more time to affect the amount remaining invested.
This is why an annual fee that appears relatively small when viewed over one year can have a more noticeable effect when repeated across 10, 20 or 30 years.
Why Time Is Your Greatest Investing Advantage explains the wider relationship between time and investment growth.
What Can a 1% Difference in Fees Mean Over 30 Years?
A simplified example can help isolate the effect of recurring investment costs.
Imagine £10,000 is invested for 30 years and achieves a hypothetical 7% annual return before fees. There are no additional contributions.
Now compare three different annual fee assumptions.
For simplicity, we will treat each fee as a direct reduction in the annual return retained by the investor:
- a 0.25% annual fee leaves a simplified growth rate of 6.75%;
- a 0.75% annual fee leaves a simplified growth rate of 6.25%; and
- a 1.25% annual fee leaves a simplified growth rate of 5.75%.
Everything else remains unchanged.
Each scenario starts with £10,000 and assumes the same 7% annual growth before fees. Only the annual fee changes. All three scenarios begin with the same £10,000 and assume the same 7% annual growth before fees. Higher recurring fees leave less money invested, reducing the amount available to participate in subsequent growth.
How Investment Fees Can Change Long-Term Growth
Scenario
The difference created by recurring fees can widen over time
After 30 years, the lowest-fee scenario has a hypothetical value of approximately £70,900, while the highest-fee scenario has approximately £53,400.
That is a difference of around £17,500.
The annual fee assumptions differ by only one percentage point.
The difference also develops gradually rather than appearing suddenly at the end. In this simplified example, the gap between the lowest- and highest-fee scenarios is approximately £1,700 after 10 years, more than £6,000 after 20 years and around £17,500 after 30 years.
This is an illustration rather than a forecast. Real investment returns fluctuate, and real investment charges can be calculated and deducted in different ways.
Treating a fee as a direct reduction in an assumed annual return is therefore a simplified way of demonstrating the underlying relationship rather than a precise model of every investment.
Why Is the Difference More Than the Fees Themselves?
The £17,500 difference in the previous example should not be interpreted as £17,500 simply being deducted in charges.
There are two different effects involved.
The Direct Cost
Money used to meet an investment charge is removed from the value that would otherwise remain with the investor. This is the immediate financial effect of the fee.
The Lost Growth Opportunity
Once money has been used to meet a charge, it is no longer available to participate in future investment returns. If positive growth subsequently occurs, this can create an additional difference in the eventual investment value.
The long-term difference between two fee scenarios can therefore be greater than the difference viewed only as money directly deducted in charges.
This is why recurring costs and compounding are closely connected.
Compounding can allow positive investment growth to build on previous positive growth. But if fees continually reduce the amount remaining invested, there is less money available to participate in that process.
The effect becomes increasingly visible as the investment period becomes longer.
It is therefore useful to think about investment fees not only in terms of what they cost today, but also in terms of how they can affect the amount remaining available for future growth.
What Types of Investment Fees Might You Encounter?
Investment fees can take different forms, and the terminology used can vary between investments, providers and services.
Common Types of Investment Fees
Investment costs do not all work in the same way. Understanding what a charge relates to can make it easier to see how it may affect an investment.
Fund or ongoing charges
Investment funds can have ongoing costs associated with operating and managing the fund. Where these are percentage-based, the monetary amount charged can change as the value of the investment changes.
Platform or account fees
A provider may charge for the platform or account through which investments are held. These fees can be percentage-based, fixed monetary charges or use a structure that changes according to the amount invested.
Transaction or dealing charges
Costs can sometimes arise when investments are bought or sold. Their effect may therefore depend partly on how frequently transactions take place rather than simply on the value of the investment.
Advice or management charges
Additional charges can apply where investment advice or management services are provided. The way these costs are calculated depends on the service and charging structure involved.
These distinctions matter because different types of fee can behave differently.
A fixed £5 charge does not have the same relationship with investment size as a charge equal to 0.5% of the portfolio.
Similarly, a dealing charge incurred when an investment is bought or sold behaves differently from an ongoing percentage charge deducted repeatedly while the investment is held.
The examples earlier in this guide deliberately simplify those differences so that the effect of recurring costs can be isolated.
Why Doesn’t the Headline Fee Tell the Whole Story?
A percentage or monetary charge is useful information, but it does not necessarily tell you everything about the cost structure.
Three questions can help explain what the charge actually means:
What is being charged?
Is the cost associated with a fund, an investment platform, a transaction or another service?
What is the charge calculated against?
A percentage might apply to the value of an investment, while another fee might be a fixed monetary amount regardless of portfolio size.
How often is the charge incurred?
Some costs recur regularly. Others arise only when particular actions take place.
These differences can change the monetary effect of a fee.
For example, a fixed £5 charge represents 0.5% of £1,000 but only 0.05% of £10,000. A percentage-based charge behaves differently because its monetary value changes with the amount against which it is calculated.
Transaction charges introduce another variable because their effect can depend partly on how often transactions occur.
The important principle is therefore not simply to identify the first fee shown. It is to understand which costs apply, how they are calculated and when they are charged.
Fees Matter, but They Are Not the Only Consideration
Investment costs can have a meaningful effect on long-term growth, but they should not be considered in isolation.
Two investments with different charges may also differ in:
- what they invest in;
- their objectives;
- the risks involved;
- how they are managed; and
- the services provided alongside them.
A lower fee does not automatically make one investment better than another.
Equally, a higher fee does not guarantee better investment performance simply because more is being charged.
The examples in this guide deliberately assume identical investment growth before fees. That allows the effect of costs to be isolated mathematically.
Real investments do not work that neatly.
Different investments can produce very different returns, and those returns can change considerably from year to year. What Are Average Investment Returns? explains why historical returns can provide useful context without telling you what a particular investment will produce in the future.
Risk can also differ between investments. Comparing costs without considering the uncertainty associated with the investment can therefore give an incomplete picture. Risk vs Reward in Investing Explained explores that relationship separately.
The useful principle is not simply “choose the lowest fee”.
It is to understand what an investment costs, how those costs work and how they may affect the amount remaining invested over time, while recognising that fees are only one characteristic of an investment.
Common Misunderstandings About Investment Fees
Small percentages and different charging structures can make the long-term effect of investment costs easy to underestimate.
These distinctions are particularly important when looking at long-term projections.
A small change to an annual percentage can create a noticeable difference in a mathematical projection, but the calculation still depends on the assumptions being used.
How to Model the Effect of Fees
The Investment Growth Calculator can be used to explore how recurring differences in costs might affect hypothetical long-term investment growth.
For a simplified comparison, keep the following assumptions unchanged:
- starting investment;
- regular contributions;
- investment period; and
- assumed growth before fees.
Then alter only the simplified return retained after the fee.
For example, if you assume hypothetical investment growth of 7% a year before fees, you could compare:
0.25% fee → 6.75% simplified retained growth
0.75% fee → 6.25% simplified retained growth
1.25% fee → 5.75% simplified retained growth
Keeping the other assumptions unchanged isolates the mathematical difference created by those fee assumptions.
This should not be treated as a precise way to calculate every real investment charge.
Different fees can be deducted at different times, calculated against different amounts or charged as fixed sums rather than percentages. Future investment returns are also uncertain.
The purpose of the exercise is therefore to answer a narrower question:
How could a recurring difference in costs affect long-term growth if the other assumptions remained the same?
Used in that way, the calculator is a scenario tool rather than a prediction of what an investment will actually produce.
Conclusion
Investment fees can affect long-term growth in more than one way.
There is the direct cost of the charge itself. But money used to meet that charge is also no longer available to participate in future investment growth.
When recurring costs continue over many years, this lost growth opportunity can help create a much larger difference between investment values than might be apparent from looking at one year’s fee alone.
The eventual effect depends on the size and structure of the charges, the amount invested, the investment period and the returns actually achieved.
Costs therefore matter, particularly over long periods, but they remain one part of the wider characteristics of an investment.
The central principle is:
Fees can reduce both the money you keep today and the amount that remains available to participate in future growth.
