The risk-free rate of return is the theoretical rate of return of an investment with zero risks. The risk-free rate represents the interest an investor would expect from an absolutely risk-free investment over a specified period of time. The real risk-free rate can be calculated by subtracting the current inflation rate from the yield of the Treasury bond matching your investment duration.In theory, the risk-free rate is the minimum return an investor expects for any investment because he will not accept additional risk unless the potential rate of return is greater than the risk-free rate.In practice, however, a truly risk-free rate does not exist because even the safest investments carry a very small amount of risk. Thus, the interest rate on a three-month U.S. Treasury bill is often used as the risk-free rate for U.S.-based investors.Determination of a proxy for the risk-free rate of return for a given situation must consider the investor's home market, while negative interest rates can complicate the issue.

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