Costs and Investor Outcomes · Collective Funds
Small recurring costs affect every year of compounding. Inflation then changes what the ending balance can buy, so nominal growth and purchasing power should be examined separately.
Compare paths, not one year
Consider $10,000 invested for 20 years with a constant 6% annual return before costs. Simplifying fees as an annual percentage point reduction, a 0.20% cost leaves 5.80% growth and about $30,883. A 0.80% cost leaves 5.20% growth and about $27,562.
The roughly $3,321 difference includes both fees and the growth those fees could otherwise have earned. These are illustrations, not forecasts. Actual returns vary, and expense accrual is more detailed than this simplified model.
Adjust purchasing power
The exact one period real return is one plus the nominal return, divided by one plus inflation, then minus one. A 5% nominal return with 3% inflation produces approximately 1.94% real growth, not 5% more purchasing power.
For a long projection, apply consistent inflation assumptions to the ending value or use real returns throughout. Do not mix nominal contributions with real spending targets without an explicit adjustment.
Use a range of assumptions
A useful projection includes weaker returns, higher costs or inflation, and changes in contributions. The purpose is to understand sensitivity rather than select the most attractive output.
Fees are more observable than future market returns, but they are not the only driver of outcomes. A lower fee fund with unsuitable risk can still be the wrong choice. First compare appropriate exposures, then examine the costs of obtaining them.
Try it yourself
A fund earns 4% after fees while inflation is 2%. What is the approximate exact real return?
Show the worked answer
1.04 divided by 1.02, minus one, equals about 1.96%.
Further reading
Educational material, not a recommendation to buy or sell a fund. Numerical examples are hypothetical. This guide focuses on U.S. collective investment funds and retirement CITs. Terms, eligibility and tax treatment vary by fund, account and jurisdiction.
