The Incremental Borrowing Rate is an important concept in accounting, particularly when businesses need to measure lease liabilities under accounting standards such as Ind AS 116. When the interest rate implicit in a lease cannot be readily determined, a company may need to estimate the rate it would have to pay to borrow money for a similar period, with similar security and economic conditions.

Understanding how the Incremental Borrowing Rate is calculated helps businesses determine the present value of lease payments more accurately and maintain appropriate financial reporting. It can also affect the amount recognized as a lease liability, right-of-use asset, and subsequent interest expense.

What Is the Incremental Borrowing Rate?

The Incremental Borrowing Rate is 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 comparable economic environment.

In simple terms, it answers the question: what interest rate would the business pay if it had to borrow money instead of entering into the lease?

This rate becomes particularly relevant when the interest rate implicit in a lease is not directly available to the lessee.

For example, suppose a company leases office premises for five years. If the lease agreement does not provide enough information to determine the implicit interest rate, the company may estimate an appropriate borrowing rate based on its own financing conditions.

Why Is the Rate Important?

The rate is important because it is used to discount future lease payments to their present value. Under lease accounting, future payments are not simply added together. They are discounted because money payable several years in the future is worth less than money payable today.

A higher discount rate generally produces a lower present value of lease payments, while a lower rate generally produces a higher present value.

Therefore, the selected rate can influence:

• Lease liability
• Right-of-use asset
• Interest expense
• Depreciation expense
• Financial ratios
• Reported assets and liabilities

Because of this, businesses should use a reasonable and well-supported methodology when determining the rate.

Factors Used to Calculate the Rate

There is no single universal percentage that applies to every lease. The rate depends on several factors related to the borrowing arrangement and the underlying leased asset.

1. Lease Term

The length of the lease is an important consideration. A two-year lease may require a different borrowing rate than a ten-year lease.

Generally, the rate should reflect the period over which the borrowing would take place.

2. Amount of Financing

The amount that the business would need to borrow is also relevant. A large financing requirement may have different borrowing characteristics from a smaller one.

The company should consider the amount required to obtain an asset with a similar value to the leased asset.

3. Security

Security can significantly affect borrowing costs. A secured loan may have a lower interest rate than an unsecured loan because the lender has an asset or other security supporting the financing.

Therefore, the assessment should consider the security that would reasonably be available for comparable borrowing.

4. Economic Environment

The economic environment in which the lease exists should also be considered. Market interest rates, inflation, monetary policy, and prevailing lending conditions can affect borrowing costs.

A rate appropriate several years ago may not necessarily be appropriate for a new lease today.

5. Credit Risk of the Lessee

The company's creditworthiness is another major factor. A financially strong company may be able to borrow at a lower rate than a business with higher credit risk.

The lessee should therefore consider its own credit profile when estimating the appropriate rate.

6. Currency

The currency in which lease payments are made should also be considered. Borrowing rates can differ substantially between currencies because of different interest-rate environments and economic conditions.

For example, a lease denominated in Indian rupees would generally require consideration of borrowing conditions relevant to Indian rupee financing.

How the Incremental Borrowing Rate Is Calculated

Calculating the rate generally involves identifying a suitable starting borrowing rate and then making adjustments for differences between the actual borrowing and the lease arrangement.

A practical approach can involve the following steps.

Step 1: Identify a Reference Borrowing Rate

The company can begin with observable borrowing rates for loans with similar characteristics.

Possible reference points may include:

• Recent loans obtained by the company
• Bank lending rates
• Comparable financing arrangements
• Market borrowing rates
• Rates for similar companies

The objective is to establish a reasonable market-based starting point.

Step 2: Adjust for the Lease Term

The reference borrowing may have a different maturity from the lease. The rate should therefore be adjusted to reflect the relevant lease term.

For instance, if comparable borrowing is available for three years but the lease runs for seven years, the company should consider the financing conditions applicable to a seven-year borrowing period.

Step 3: Consider Credit Risk

The reference rate may relate to a borrower with a different credit profile. Adjustments may therefore be necessary to reflect the lessee's credit risk.

A company with stronger creditworthiness may require a lower rate, while a company with higher credit risk may require a higher rate.

Step 4: Consider Security and Collateral

The company should evaluate whether comparable borrowing would be secured or unsecured.

If the hypothetical borrowing would involve security, the rate should reflect that financing structure. Differences in collateral can have a meaningful impact on the borrowing cost.

Step 5: Consider the Value and Nature of the Asset

The underlying asset also matters. Financing an office building, vehicle, warehouse, or specialized equipment can involve different risk characteristics.

The company should consider whether the borrowing rate reflects financing for an asset comparable to the leased asset.

Step 6: Make Market and Economic Adjustments

Finally, the company should consider current economic conditions and market rates.

Interest rates can change over time because of inflation, central-bank policies, liquidity conditions, and changes in credit markets. The selected rate should therefore reflect conditions relevant to the date of assessment.

Illustrative Example

Consider a company that enters into a five-year equipment lease. The company expects to make annual lease payments of ₹10 lakh.

Assume the lease does not provide a readily determinable implicit interest rate. The company estimates that a comparable five-year borrowing would carry an annual interest rate of 9%.

The company could use this rate to discount the future lease payments and determine their present value.

Using the basic present-value concept:

Present Value = Future Payment ÷ (1 + r)ⁿ

Where:

• r = discount rate
• n = relevant period

For multiple lease payments, each future payment is discounted separately and then added together.

The resulting amount represents the initial lease liability, subject to the applicable accounting requirements.

The example is simplified. In practice, businesses may need to consider payment timing, lease incentives, residual value considerations, options, reassessments, and other factors depending on the specific lease arrangement.

Difference Between Incremental Borrowing Rate and Implicit Rate

The implicit rate and the Incremental Borrowing Rate are related but not identical.

The interest rate implicit in the lease is the rate that causes the present value of lease payments and the relevant unguaranteed residual value to equal the fair value of the underlying asset plus relevant costs, as applicable under the accounting requirements.

The Incremental Borrowing Rate, on the other hand, is based on the rate the lessee would have to pay to borrow funds under comparable conditions.

Where the implicit rate is readily determinable, it may be used. Where it cannot be readily determined, the lessee may need to determine an appropriate incremental borrowing rate.

Common Challenges in Determining the Rate

Businesses may face several challenges when calculating the rate.

One common difficulty is the lack of directly comparable borrowing arrangements. A company may not have recently taken a loan with the same term, currency, security, and amount.

Another challenge is obtaining reliable market information. Bank quotes and publicly available rates may not perfectly match the characteristics of the lease.

Companies may also have multiple leases with different terms, currencies, assets, and commencement dates. Using one rate for every lease may not always produce an appropriate result.

For this reason, businesses should document the assumptions and methodology used to determine the rate.

Documentation and Support

A well-supported calculation is important for financial reporting and audit purposes. Companies should maintain evidence explaining how the rate was determined.

Useful documentation may include:

• Bank borrowing rates
• Loan agreements
• Credit assessments
• Market interest-rate data
• Comparable financing arrangements
• Details of lease terms
• Security assumptions
• Currency considerations
• Management calculations
• Reasons for adjustments

The documentation should demonstrate why the selected rate is reasonable for the particular lease.

Conclusion

The Incremental Borrowing Rate plays an important role in lease accounting when the implicit interest rate cannot be readily determined. It represents an estimate of the rate a business would pay to borrow funds under circumstances comparable to the lease.

Calculating the rate requires consideration of the lease term, borrowing amount, security, credit risk, currency, asset characteristics, and prevailing economic conditions. A careful approach helps businesses arrive at a reasonable discount rate and supports accurate measurement of lease liabilities and right-of-use assets.

Because the rate can have a significant effect on financial statements, companies should use reliable information, make appropriate adjustments, and maintain clear supporting documentation. A consistent and well-documented methodology can make the lease accounting process more transparent, reliable, and easier to review.