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 use the Compound Annual Growth Rate (CAGR) to express the average annual growth rate, accounting for compound interest effects. Total return shows the cumulative gain or loss over the entire period, while CAGR provides a fair comparison between investments of different durations. These two metrics can differ significantly for the same investment.

Returns can be gross or net. Gross returns do not account for fees, management expenses, or taxes, while net returns reflect the actual amount the investor keeps after these deductions. Fees such as purchase and sale commissions, annual management fees, and capital gains or dividend taxes reduce net returns. Over time, these costs compound and can substantially lower the effective return.

Common mistakes include comparing total returns over several years with annual returns of another investment and ignoring fees and taxes, which can lead to overestimating actual gains. Additionally, nominal returns do not consider inflation, whereas real returns adjust for it, reflecting the true purchasing power change.

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 metric for their comparison needs.