
The risk-free rate is a crucial concept in valuation theory, and its accurate determination is of utmost importance for valuation practitioners and auditors. In the context of Australia, the risk-free rate is often associated with government bond yields, typically with a tenure of 10 or 20 years. The selection of the appropriate risk-free rate is influenced by the expected period of cash flows being valued and the introduction of lease standards, such as AASB 16, which requires practitioners to consider the incremental borrowing rate for lessees.
| Characteristics | Values |
|---|---|
| Definition | "The rate of interest that a lessee would have to pay to borrow over a similar term, and with similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment." |
| Example | Australian government bond yields as of 21 August 2023 plus a 2% asset-specific risk premium. |
| Common Practice | Use a 10-year or 20-year government bond yield when valuing a going concern business with a perpetual life. |
| Lease Standards | Ask for the incremental borrowing rate (IBR) for a lessee, which is connected to the duration of the contract. |
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What You'll Learn

Lease standards and the incremental borrowing rate
The incremental borrowing rate (IBR) is a common term in lease accounting today, referring to the interest rate a lessee would have to pay to borrow funds to finance an asset similar to a lease's right-of-use (ROU) asset, over a similar term and in a similar economic climate.
IBR is essential as it reflects lease obligations on financial statements. Both ASC 842 and IFRS 16 require operating and finance leases to be recognised on the balance sheet, so the IBR helps determine a company's financial health.
The IBR is calculated using the implicit rate in the lease, if known, or the incremental borrowing rate. The implicit interest rate on a lease is the interest rate the lessor charges the lessee, implied by the value of the item being leased compared to the total amount paid during the lease term. However, as this implicit rate is often challenging to determine, the IBR becomes critical.
IBR is calculated using three key components: assessment date, credit rating, lease asset class, debt details, and currency requirements. This calculation can be done using Deloitte's IBR Calculator, which provides a detailed analysis of a company's lease portfolio and accounting choices that comply with IFRS 16.
In Australia, non-borrowing Commonwealth entities must use the table of Leases - zero coupon discount rate to calculate their IBR. Commonwealth corporate entities that can borrow to fund their activities must identify their own IBR.
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Matching risk-free security with the period of cash flow valuation
When determining the risk-free rate, it is important to match the risk-free security with the period of cash flow valuation. This is a fundamental concept in valuation theory. The risk-free rate is defined as the rate of interest that a lessee would have to pay to borrow over a similar term, with a similar security, to obtain an asset of similar value in a similar economic environment.
In the context of cash flow valuation, the risk-free rate is used to discount future cash flows to their present value. This is a critical step in valuing a business or investment. When valuing a going concern with perpetual life, it is common market practice to use a 10-year or 20-year government bond yield in the discount rate build-up. This is because these long-term government bonds serve as a proxy for the weighted duration of the cash flows of the asset being valued.
However, when valuing contracts or 'right-to-use' assets/obligations, it is important to match the contract length with a risk-free security of a similar length. For example, when valuing a 10-year contract, it is common to use a 10-year government bond yield. This ensures that the cash flows are appropriately discounted over the expected period.
It is worth noting that the application of a 10-year yield when valuing a 10-year contract is often considered incorrect. This is because the cash-flow duration of a contract with a finite life may differ from its nominal length. For example, a lease with annual rent payments may have a cash-flow duration of approximately 5 years, in which case a 5-year risk-free security would be more appropriate.
By matching the risk-free security with the period of cash flow valuation, investors can better understand the interest-risk sensitivity of their investments and make more informed decisions.
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The role of duration in risk management
The concept of duration is closely connected with matching risk-free security with the period in which cash flows are to be valued. Duration is a measure of the interest-rate risk sensitivity of assets and liabilities. It is the weighted average of the years until the underlying cash flows are received. Duration helps investors understand how long it will take to get their original investment back and how sensitive an asset is to changes in interest rates.
Duration risk is the potential loss an investor faces due to changes in interest rates. It is an important concept in finance and investment as it provides a measure of risk and potential loss. It is particularly important for investors seeking to maximise returns while managing risk. By understanding duration risk, investors can assess the potential risks associated with a particular investment or portfolio and make more informed decisions.
Duration risk can play a role in portfolio construction and asset allocation. By considering the potential duration risk associated with an investment or asset, investors can create a more diversified and risk-managed portfolio. Duration risk can also impact portfolio performance, affecting the overall return of the portfolio.
Duration is a characteristic of a bond and is an essential tool for risk management in the fixed-income market. It measures the sensitivity of an asset price to movements in yields. For fixed-coupon bonds, duration can be defined as the average maturity of all bond payments, where each payment is weighted by its value.
By understanding the potential duration risk associated with different asset classes, investors can make informed decisions about the allocation of their investment portfolios. Duration risk is also a critical measure in evaluating the performance of bond funds or investment managers, indicating how much an investment or portfolio is exposed to changes in interest rates.
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The impact of interest rate changes on asset sensitivity
In Australia, it is common market practice to use a 10-year or 20-year government bond yield as the risk-free rate when valuing a going concern business with a perpetual life. The risk-free rate is an important consideration in determining the value of a business or asset over a long period.
When examining the impact of interest rate changes on asset sensitivity, it is important to understand the concept of interest rate sensitivity. Interest rate sensitivity is a measure of how much the price of a fixed-income asset will fluctuate in response to changes in the interest rate environment. This type of sensitivity is crucial when selecting a bond or other fixed-income instrument that an investor may sell in the secondary market. It is worth noting that interest rate sensitivity affects both buying and selling.
The longer the maturity of an asset, the more sensitive it is to changes in interest rates. This is because longer-term securities have higher exposure to interest rate risk. Additionally, a lower coupon rate leads to higher security interest rate sensitivity. This is due to the higher interest rate risk associated with a lower coupon rate.
One way to measure interest rate sensitivity is through the effective duration, which considers multiple bond characteristics such as coupon payments and maturity. The higher the duration, the higher the interest rate sensitivity. For example, if a bond mutual fund has an average effective duration of 11 years, a 1% increase in interest rates would result in an expected loss of 11% of the fund's value. Conversely, if interest rates were to decrease by 0.5%, the price of a corporate bond with a duration of 2.5 would be expected to increase by 1.25%.
Understanding interest rate sensitivity is crucial when selecting fixed-income securities. Changes in interest rates can significantly impact the overall yield of securities, and traders in bonds and fixed-income assets closely monitor these changes.
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Government bond yields as a benchmark
When determining the risk-free rate in Australia, it is common to use government bond yields as a benchmark. This is because government bonds are generally considered to be risk-free securities, as they are backed by the full faith and credit of the issuing government. In the case of Australia, the relevant bonds would be those issued by the Commonwealth Government.
The choice of which bond yield to use as a benchmark depends on the context and the expected period of cash flows being valued. For example, when valuing a going concern business with a perpetual life, it is common market practice to use a 10-year or 20-year government bond yield in the discount rate build-up. This is because the long-term nature of these bonds helps to match the expected period of cash flows for such businesses.
On the other hand, when valuing contracts or 'right-to-use' assets/obligations, such as those covered by AASB 16, cash flows are expected over a discrete period. In these cases, it is common for practitioners to match the contract length with a risk-free security of a similar length. For example, a 10-year government bond yield would be used to value a 10-year contract. This ensures that the risk-free rate aligns with the expected duration of cash flows for that specific contract.
The concept of duration is closely connected to this process of matching risk-free securities with the expected period of cash flows. Duration measures the interest-rate sensitivity of assets and liabilities and helps investors understand how long it will take, on average, to get their original investment back. Theoretically, longer-duration assets are more sensitive to changes in interest rates, which is an important consideration when selecting the appropriate risk-free rate.
In summary, government bond yields, particularly those with longer durations, serve as a critical benchmark for determining the risk-free rate in Australia. The choice of which specific bond yield to use depends on the nature of the valuation and the expected period of cash flows, ensuring that the risk-free rate aligns accurately with the unique characteristics of the investment or contract being valued.
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Frequently asked questions
A risk-free rate is a theoretical rate of return of an investment with zero risks. In other words, it is the return on an investment that carries no risk of financial loss.
In Australia, the risk-free rate is commonly assumed to be the yield on a 10-year or 20-year government bond. This is because the Australian government is assumed to have zero default risk, making its bonds "risk-free".
The IBR is the rate of interest that a lessee would have to pay to borrow funds to obtain an asset of similar value in a similar economic environment. The IBR includes the risk-free rate, which is usually the Australian government bond yield, plus an additional asset-specific risk premium.
The risk-free rate is an important input in valuation models such as the discounted cash flow (DCF) model. By discounting future cash flows using the risk-free rate, analysts can determine the present value of those cash flows and, by extension, the value of the company.











































