The risk-free interest rate is the theoretical return an investor can earn with zero risk of financial loss — typically represented by U.S. Treasury bills or government bonds.
While no investment is truly 100% risk-free, government-backed securities serve as a global proxy because the U.S. government can print its own currency to pay off debt (making the likelihood of default negligible).
Risk-free interest rate is important to the economy because it…
- Changes in the rate affect borrowing costs across the entire economy
- It helps determine whether taking on additional risk is worthwhile
- It serves as the baseline for evaluating all other investments
- Financial models like CAPM and DCF depend on it
Let's dive into more details and explore the phenomenon better.
Why is the risk-free rate important in finance?
The risk-free rate serves as the foundation of many financial calculations and investment models. Portfolio management, asset pricing, and business evaluation all rely on this concept as their starting point.
Investment benchmark
Investors compare the expected return of any investment with the risk-free rate to determine whether the investment offers enough reward for the risk involved.
If Treasury bills yield 3%, that represents the approximate risk-free rate — and a stock investment should offer an expected return higher than 3% to justify its additional risk.
The gap between an investment's expected return and the risk-free rate represents the risk premium investors demand.
Financial models
Several widely used models rely on the risk-free rate as a key input:
| Model | Purpose | How it uses the risk-free rate |
|---|---|---|
| CAPM | Calculates expected stock returns | Starting point for return calculation |
| DCF | Values companies and assets | Base rate for discounting future cash flows |
| Bond pricing | Determines fair bond values | Benchmark for yield spreads |
Lending foundation
Financial institutions often use the government bond risk-free rate as a base rate when setting lending and borrowing costs. Rates for mortgages, personal loans, corporate bonds, and business loans are typically calculated as:
Interest Rate = Risk-Free Rate + Risk Premium
The risk premium varies with the borrower's creditworthiness and the loan's term. When the risk-free interest rate rises, borrowing costs across the economy tend to increase. Conversely, when the risk-free rate falls, borrowing often becomes cheaper — influencing consumer spending, business investment, and overall economic activity.
How does CAPM use the risk-free rate?
The Capital Asset Pricing Model (CAPM) uses the risk-free rate as the baseline for calculating expected returns on stocks and risky assets. Every investment return begins with the risk-free rate — and investors receive higher expected returns only if they take on additional market risk.
Expected Return = Risk-Free Rate + Beta × (Market Return − Risk-Free Rate)
The formula components break down as follows: Market Return − Risk-Free Rate is the market risk premium, Risk-Free Rate refers to the baseline return available without risk, and Beta measures how sensitive a stock is to overall market movements.
Calculation example
Consider a stock with a beta of 1.2, where the risk-free rate is 3%, and the expected market return is 8%:
| Component | Value |
|---|---|
| Risk-free rate | 3% |
| Market return | 8% |
| Stock beta | 1.2 |
| Expected return | 3% + 1.2 × (8% − 3%) = 9% |
Investors would require roughly 9% return to justify holding that stock. A beta above 1.0 indicates the stock moves more than the market (higher risk, higher expected return), while a beta below 1.0 suggests lower volatility.
What assets are considered risk-free?
Although the idea of a completely risk-free investment is theoretical, some financial instruments are widely considered close to risk-free because their default probability is extremely low. National governments typically issue these assets when they have strong financial systems and stable economies.
Treasury bills
Short-term Treasury bills (T-bills) are the most commonly used benchmark for the risk-free rate. T-bills are short-term government securities issued at a discount and redeemed at their full face value at maturity, with terms of
- 4 weeks
- 13 weeks
- 26 weeks
- 52 weeks
Because Treasury bills are backed by the government's ability to collect taxes, issue currency, and manage national debt, they are widely considered among the safest investments available.
Government bonds
Longer-term government securities are another common proxy for the risk-free rate. Government bonds typically have maturities such as
- 2-year bonds
- 5-year bonds
- 10-year bonds
- 30-year bonds.
Investors often select a government bond with a maturity that matches the investment's time horizon. A 10-year government bond yield, for instance, is often used as the risk-free rate in stock valuation models, while short-term bonds may be used for short-term financial modeling.
Sovereign debt
Countries with strong economies and stable political systems issue highly rated sovereign debt that global investors treat as near risk-free. Credit rating agencies assess these securities, and analysts use them to estimate the current risk-free rate in global financial markets.
What is the difference between nominal and real risk-free rates?
Two different concepts apply when talking about risk-free interest rate — the nominal rate (the "sticker price" of money) and the real rate (the "purchasing power" rate).
Nominal rate
The nominal rate is the percentage return an investor receives in absolute currency terms, without adjusting for inflation.
Nominal Risk-Free Rate = Real Risk-Free Rate + Expected Inflation
If you buy a 1-year Treasury bill with a yield of 4.5%, your nominal risk-free rate is 4.5%. Investing $1,000 means you will have $1,045 in one year — but those dollars may buy less than they do today.
Real rate
The real rate measures how much your wealth actually grows after accounting for the rising cost of goods and services.
Real Risk-Free Rate = (1 + Nominal Rate) ÷ (1 + Inflation Rate) − 1
Following the example above, if the nominal rate is 4.5% but inflation is running at 3%, your real risk-free rate is only about 1.5%. While you have more dollars, those dollars buy 3% less than they used to.
| Rate type | Formula | What it measures |
|---|---|---|
| Nominal | Real rate + expected inflation | Absolute dollar return |
| Real | (1 + nominal) ÷ (1 + inflation) − 1 | True purchasing power growth |
What factors influence the risk-free rate?
The risk-free interest rate fluctuates over time in response to economic conditions, market demand, and government policies. Understanding these drivers helps investors anticipate changes in interest rates and their impact on financial markets.
Inflation expectations
Inflation is one of the most important drivers of the nominal risk-free rate. If investors expect inflation to rise, they will demand higher interest rates to protect the purchasing power of their investments.
For example, if investors expect inflation of 3%, they will require a higher return than if they expect inflation to be 1%. As a result, rising inflation expectations typically push the risk-free interest rate upward.
Monetary policy
Central banks play a major role in influencing interest rates through monetary policy decisions. When central banks adjust policy interest rates or conduct open market operations, they indirectly affect the yield on government securities.
When central banks raise policy rates, government bond yields and the risk-free rate often increase. When central banks lower interest rates, government yields tend to fall — affecting borrowing costs across the entire financial system.
Economic growth
Stronger economic growth can also increase the risk-free rate. When the economy expands, businesses borrow more to invest and grow, consumers increase spending, and demand for capital rises. Increased demand for funds can push interest rates higher, including the risk-free rate on government bonds.
Safe asset demand
Market demand for safe investments can also affect the risk-free rate on Treasury bills. During periods of financial uncertainty or economic crises, investors often shift their money into safe government securities — a phenomenon known as flight to safety.
When demand for Treasury bills increases, their prices rise and their yields (the risk-free rate) fall. As a result, global economic uncertainty can temporarily lower the risk-free interest rate even if other economic conditions remain stable.
Frequently asked questions
What is the current risk-free rate?
The risk-free rate changes daily based on Treasury yields. Check current U.S. Treasury bill rates on the Treasury Department website or financial data providers for the most accurate figures.
Why is no investment truly risk-free?
Even government securities carry minimal risks — inflation risk, reinvestment risk, and (in extreme scenarios) political risk. However, the probability of default on major government debt is so low that these securities serve as practical proxies for risk-free returns.
Which maturity should I use for the risk-free rate?
Match the Treasury maturity to your investment horizon. Use short-term T-bills for short-term analysis and 10-year bonds for long-term stock valuations or DCF models.
