Components of Interest Rates

Updated for the 2026 CFA® Level I curriculum

An interest rate combines compensation for waiting with compensation for bearing risk. The starting point is the real risk-free rate. Investors may then require additional premiums for expected inflation, default risk, limited liquidity, and longer maturity.

For CFA Level I, you should be able to identify each component, explain what it compensates for, and calculate a required interest rate by adding the relevant parts.

Key Takeaways

• The real risk-free rate is the base return before inflation and risk premiums.

• The nominal risk-free rate combines the real risk-free rate with expected inflation.

• The default risk premium compensates for the possibility of missed payments.

• The liquidity premium compensates for difficulty selling a security quickly near fair value.

• The maturity premium compensates for uncertainty associated with a longer investment horizon.

• Higher required premiums produce a higher required interest rate, all else equal.

• Expected inflation should appear only once in the calculation.

What You Need to Know for CFA Level I

Think of the interest rate as a stack of components.

Focus on the following:

• Distinguish the real risk-free rate from the nominal risk-free rate.

• Match each premium to the risk or security characteristic it represents.

• Add only the components provided or implied by the question.

• Avoid adding the inflation premium twice.

• Use the phrase “all else equal” when explaining how one premium affects the required rate.

• Recognize that this additive framework helps explain required returns. Actual market yields can also reflect supply, demand, taxes, and other market conditions.

What Are the Components of an Interest Rate?

Under the CFA framework, a required interest rate can be expressed as a real risk-free rate plus four premiums.

Where:

• Inline equation code = required interest rate

• Inline equation code = real risk-free rate

• Inline equation code = inflation premium

• Inline equation code = default risk premium

• Inline equation code = liquidity premium

• Inline equation code = maturity premium

The real risk-free rate and inflation premium can also be combined into the nominal risk-free rate:

The required rate can therefore be written as:

Use the second form when the question gives you the nominal risk-free rate directly. The inflation premium is already included, so you should add only the remaining security-specific premiums.

Interest Rate Components at a Glance

Each component answers a different question. The exam may give you all five parts or provide a nominal risk-free rate and ask you to add the remaining premiums.

What Is the Real Risk-Free Rate?

The real risk-free rate is the theoretical return on an investment with no default risk, no liquidity risk, and no expected inflation.

It represents compensation for giving up current consumption in exchange for future consumption. In other words, an investor requires some return simply for waiting.

The real risk-free rate is a conceptual starting point. Market securities used as proxies may still reflect other features, such as maturity, liquidity, or changes in expected inflation.

What Is the Nominal Risk-Free Rate?

The nominal risk-free rate combines the real risk-free rate with the inflation premium.

Suppose the real risk-free rate is 1.50% and the expected inflation premium is 2.00%.

The 3.50% nominal risk-free rate includes compensation for both waiting and expected inflation.

The inflation premium reflects expected inflation. If actual inflation is higher than expected, the investor’s realized purchasing power may still fall.

What Is the Default Risk Premium?

The default risk premium compensates investors for the possibility that an issuer will fail to make promised interest or principal payments.

Higher perceived credit risk generally leads investors to demand a higher default risk premium. A financially strong issuer may have a small premium, while a weaker issuer may need to offer a much higher yield.

Within this framework, the default risk premium is one part of the required interest rate. More advanced credit analysis may also consider probability of default, loss given default, recovery rates, and credit ratings.

What Is the Liquidity Premium?

The liquidity premium compensates investors for the possibility that a security cannot be sold quickly without accepting a lower price.

A security may require a higher liquidity premium when:

• Trading volume is low.

• The number of willing buyers is limited.

• Bid-ask spreads are wide.

• The security is difficult to value.

• Selling a large position could move the market price.

CFA Level I treats liquidity as an additive risk premium. You are usually asked to identify or add the premium rather than calculate it from a separate formula.

What Is the Maturity Premium?

The maturity premium compensates investors for the uncertainty associated with committing funds over a longer period.

A longer-maturity security is exposed to more time for interest rates, inflation expectations, and economic conditions to change. Investors may therefore require additional compensation.

Keep the maturity premium separate from duration. The maturity premium is part of the required return. Duration measures how sensitive a bond’s price is to changes in yield.

How Do the Components Affect the Required Interest Rate?

A change in one risk factor affects the premium associated with that risk, assuming the other factors remain constant.

• Higher expected inflation raises the inflation premium.

• Weaker issuer credit quality raises the default risk premium.

• Lower market liquidity raises the liquidity premium.

• Longer maturity may raise the maturity premium.

• A higher real required return raises the real risk-free component.

The phrase all else equal helps isolate the effect of one change.

For example, suppose two securities are identical except that one issuer has weaker credit quality. The difference in their required rates can be attributed to the default risk premium.

Worked Example

A security has the following interest rate components:

• Real risk-free rate: 1.20%

• Inflation premium: 2.40%

• Default risk premium: 1.80%

• Liquidity premium: 0.60%

• Maturity premium: 0.50%

Step 1: Calculate the Nominal Risk-Free Rate

The nominal risk-free rate combines the real return and expected inflation.

Step 2: Add the Security-Specific Premiums

Step 3: Calculate the Required Interest Rate

The security’s required interest rate is 6.50%.

The full calculation can also be completed in one step:

Step 4: Isolate One Premium

Suppose an otherwise identical security has no default risk premium.

The 1.80 percentage-point difference represents the required compensation for default risk under the assumptions of the question.

How to Recognize These Questions on the CFA Exam

Look for wording such as:

• Real risk-free rate

• Nominal risk-free rate

• Expected inflation premium

• Default risk premium

• Liquidity premium

• Maturity risk premium

• Required interest rate

• All else equal

• Compensation for bearing risk

Questions may ask you to calculate the full rate, identify a missing component, or explain why two securities have different required returns.

Common Exam Traps

• Treating the real and nominal risk-free rates as the same measure.

• Adding the inflation premium after starting with a nominal risk-free rate.

• Confusing expected inflation with unexpected inflation.

• Mixing up default risk and liquidity risk.

• Treating the maturity premium as a measure of bond price sensitivity.

• Assuming that a higher quoted yield reveals which premium increased without more information.

• Adding a premium that the question says is absent.

• Forgetting that each rate comparison assumes the other factors remain unchanged.

Practice Question

A security has the following components:

• Nominal risk-free rate: 3.10%

• Default risk premium: 1.40%

• Liquidity premium: 0.50%

• Maturity premium: 0.70%

What is the security’s required interest rate?

1. 4.30%

2. 5.70%

3. 6.20%

FAQs About the Components of Interest Rates