What it means
Think of the risk-free rate as the safest bet in the financial world. It is a benchmark for how much you can earn from an investment considered free from risk, such as short-term bonds issued by a financially stable government.
Because these investments are backed by the government's power to tax and to print its own currency, they are seen as almost certain to pay back both the interest and the original amount invested. In practice no investment is perfectly risk-free, so finance teams use the yield on the safest government debt in their currency as the stand-in.
The risk-free rate matters because it is the starting point for judging every other opportunity. If an investment does not offer at least the risk-free rate, it is hard to justify, since you could earn that return elsewhere without worrying about losses.
The extra return you demand on top of it is called the risk premium (the reward for taking on uncertainty). Managers meet the risk-free rate inside bigger tools as well.
It feeds into the cost of capital (the return investors expect for funding the business), into discount rates used to value projects, and into models such as the Capital Asset Pricing Model, which estimates the return shareholders should require. Because it is set by the market and moves over time, finance teams look up the current figure each time they build a model rather than reusing an old one.
Think of the risk-free rate as the interest on a locked, government-guaranteed savings vault that never loses value. Every riskier choice has to beat that vault to earn a place in your plan.
In practice
Real-world examples
Example 1
An entrepreneur has $200,000 of spare cash and is considering a high-risk startup investment. She compares the startup's expected return of 14% with a risk-free rate of 4% and sees a 10% risk premium. She then asks herself whether that extra $20,000 a year is enough reward for the real chance of losing everything.
Example 2
A small manufacturer is deciding whether to borrow $500,000 to buy a new production line. The finance manager compares the line's forecast return of 9% with the risk-free rate of 4% and with the loan's interest cost. Because the premium over the safe rate is only 5%, she asks for stronger evidence before committing.
Example 3
The finance team of a software company builds a discount rate to value a new product launch. They start with the risk-free rate, add a premium for the uncertainty of the software market, and use the result to bring future cash flows back to today's value. Changing the risk-free rate by one percentage point changes every project's value, so they update it for each new model.
Think of it
Think of the risk-free rate as the interest you'd earn by putting your money in a super secure piggy bank that is guaranteed to give you a little extra money back, without any chance of loss.
Formula
Calculation
Risk premium = Expected return on the investment - Risk-free rate.
Required return (Capital Asset Pricing Model) = Risk-free rate + Beta x (Expected market return - Risk-free rate), where beta measures how strongly the investment moves with the overall market.
Worked example with an assumed risk-free rate of 4%: you place $100,000 in safe government debt and earn 4% x $100,000 = $4,000 a year with almost no risk. A risky project is forecast to return 11%, so its risk premium is 11% - 4% = 7%, which on $100,000 is an extra $7,000 a year for taking the risk.
For the required return, suppose the expected market return is 10% and your business has a beta of 1.5. The market premium is 10% - 4% = 6%, so the required return is 4% + 1.5 x 6% = 4% + 9% = 13%. A project forecast to earn only 11% would fall short of that 13% hurdle, even though it beats the 4% risk-free rate comfortably.Case study
Seen in the real world
This is a fictional, illustrative scenario. Harbourview Foods, an invented regional food distributor, had $300,000 of surplus cash and two ideas. One was to leave the money in short-term government securities, and the other was to fund a new cold-storage depot that the operations team believed would earn 12% a year. The finance manager set the risk-free rate of 4% beside the depot's forecast. The depot's premium of 12% - 4% = 8% looked attractive on paper, but she reminded the board that the safe option would deliver $12,000 a year with almost no risk, while the depot would need to deliver $36,000 a year to hit its target.
Several assumptions behind that figure, including how quickly customers would sign up, were uncertain. The board approved the depot but split the money. Harbourview kept $100,000 in safe securities as a liquidity cushion earning the risk-free rate and invested $200,000 in the depot. The structure gave the company a clear benchmark to measure the project against each year, and it agreed to review the decision if the depot's return ever dropped below the safe rate plus a 4% minimum premium.
Watch out
Common mistakes
- Believing any investment is truly risk-free, when even government debt carries risks such as inflation eroding the real return.
- Using an old risk-free rate in a new model instead of checking the current market figure.
- Comparing a risky project's return with the risk-free rate without allowing for the extra premium that the risk deserves.
Questions
People also ask
What is usually used as the risk-free rate?
Finance teams usually use the yield on short-term or long-term government debt issued by a financially stable government, in the same currency as the cash flows being analysed.
Why does the risk-free rate matter for business decisions?
It sets the minimum return any investment should beat, and it feeds directly into discount rates, the cost of capital and valuation models.
Does the risk-free rate stay the same over time?
No. It moves with market conditions and central bank policy, so models should use the figure that applies on the day of the analysis.