Annualized return

Before you rely on it

What to check

Look at the period the figure came from before trusting it.

The common error

Where people go wrong with annualized return

Annualizing a hot quarter. A 9% three-month stretch becomes a 41% annual rate on paper, and the number gets repeated as if it were a forecast.

Worked through

Annualized return in plain numbers

An investment grows from $10,000 to $12,100 in two years. The total gain is 21%. The annualized return is the yearly rate that compounds to that result: 1.21 raised to the power of one half, minus one, which is 10.0% a year. Now take a hot stretch. A fund gains 9% in three months. Annualize that by compounding four times and you get 1.09⁴ − 1, or 41.1%, and the math is right; the claim is misleading, because nothing says the fund can repeat a quarter like that four times running. The shorter the period, the more a single lucky stretch controls the annual figure.

Easily confused

Annualized return and its neighbours

Annualized return is not the average return, and it is not the same as CAGR, though the two are close cousins; a simple average of yearly returns ignores compounding and overstates the result when returns swing. Annualized return converts a return over any period into a yearly equivalent. CAGR is annualization applied between two point values with no cash flows in between. Money-weighted and time-weighted returns handle deposits and withdrawals. When a report says annualized, ask what period it came from and whether cash flows were in or out.

In real decisions

Where annualized return turns up

It puts investments of different lengths on the same footing; a 14-month gain and a 5-year gain cannot be compared until both are yearly. Fund fact sheets quote annualized figures over one, three, five and ten years; investors use them to compare against a benchmark and to project growth for planning. Employers and accounts often show annualized results to keep statements readable. It is also handy for spotting hype, since a large annualized number based on a few months usually rests on very little.

Know the edges

Where annualized return stops being reliable

Annualizing assumes the rate can be repeated, and markets rarely oblige. Periods shorter than a year make the figure fragile. Returns over one window say nothing about the next; it also ignores risk: two funds with the same annualized return can have very different drawdowns along the way. Fees and taxes change the answer if they are not already netted out, and use annualized return to describe the past. It is not a forecast.

Quick answers

What people ask about annualized return

Should I annualize a return shorter than a year? You can, but treat the result as a label, not a forecast. Annualizing a two-month gain assumes six more months just like it. The shorter the period, the shakier the number.

Is annualized return the same as the average of yearly returns? No. The average ignores compounding and overstates growth when returns swing. Annualized return, the compound rate, matches what your balance did.