# Returns | How to calculate the Risks-free Rate of Return Risk-Free Rate

Ever heard about a risk-free rate? It is the degree of returns attributed to an investment that provides a guaranteed return with zero risks.

Too good to be true?

Indeed, the risk-free rate does not technically exist; in fact, even the safest investments carry a very small amount of risk. In practice, the risk-free return is used as a “theoretical” benchmark above which investments that have risk should perform. In the Investment jargon, the difference between the expected returns of a particular investment and the risk-free rate is called the risk premium or the risk discount, depending on if the returns are higher or lower.

Let’s look at these two cases:

– Market risk premium is the risk taken above the risk-free rate with the expectation of higher returns.

– A risk discount refers to a situation in which an investor is willing to accept lower expected returns in exchange for lower risk or volatility.

How to select a Risk-Free Rate

The most relevant risk-free benchmark must be identified based on three main features:

a) the country (US, Europe, etc.). It is common practice to refer to benchmarks identified by Central Banks of developed countries

b) the sector you are investing in (Finance, Real Estate, Business, etc.)

c) the timeline of the investment

In the US, the US Treasury Bill is seen as a good example of a risk-free investment, since the government cannot default on its debt. However, the most suitable benchmark should change depending on the tenure (time period) of your investment:

– the T-bill is suitable for investments under 1 year

– US Treasury Notes is suitable for Investments between 1 and 10 years

– US Bond is suitable for Investments over 10 years

How to Calculate the Inflation adjusted Risk-Free Rate

Inflation is a kind of hidden tax, it can have a major impact on the performance of our investments. As such, it is important to take it into consideration and, when possible, calculate the Inflation-adjusted risk-free rate. This can be calculated by subtracting the current inflation rate from the Risk-Free Return

a) Formula: Risk-Free Benchmark – Inflation.

For example, if the risk-free rate of return is 3% and the inflation rate is 2%, the real risk-free rate of return is 1% (3%-2% =1%).

Because the risk-free rate is low in the first place, the real return can sometimes be negative, particularly in times of high inflation.

b) Alternative formula:  (1+ Risk Free benchmark) / (1+ Inflation Rate) – 1
For example, using the same inputs, with a risk-free rate of 3% and the inflation rate is 2%, the real risk-free rate of return is 0.98% [(1+3%)/(1+2%)-1].