Understanding Investment Returns: How to Calculate and Interpret Them Correctly

Investment return measures the profit or loss relative to the amount invested, expressed as a percentage. The basic formula is (final value minus initial investment) divided by the initial investment, multiplied by 100. For example, investing 1,000 ILS that grows to 1,150 ILS yields a 15% return, regardless of the investment duration.

When investments span multiple years, it is common to consider the Compound Annual Growth Rate (CAGR), which reflects the average annual growth rate accounting for compound interest. This differs from total return, which shows cumulative profit or loss over the entire period without annual breakdown. For instance, a 30% total return over three years does not indicate the yearly growth rate, which CAGR clarifies.

Returns can be gross or net. Gross returns exclude fees, management costs, and taxes, while net returns reflect the actual amount the investor retains after these deductions. Fees such as purchase and sale commissions, ongoing management fees, and capital gains or dividend taxes reduce net returns, often significantly over time due to compounding effects.

Common mistakes include comparing total returns over multiple years to annual returns of other investments and ignoring fees and taxes, which can lead to overestimating actual gains. Additionally, nominal returns do not account for inflation, whereas real returns do, showing the true change in purchasing power.

Past returns, including historical averages, do not guarantee future performance, as investment outcomes depend on unpredictable market conditions. Investors should always clarify whether reported returns are gross or net and consider the appropriate return measure for fair comparisons.