When businesses account for lease liabilities under accounting standards such as Ind AS 116 or IFRS 16, selecting the correct discount rate is essential. If the interest rate implicit in the lease cannot be readily determined, companies must estimate their Incremental Borrowing Rate. Using an accurate rate ensures lease liabilities and right-of-use assets are measured fairly and consistently.

This guide explains the process in simple language so finance professionals, business owners, and accounting teams can understand how to determine the appropriate borrowing rate step by step.

What Is an Incremental Borrowing Rate?

An Incremental Borrowing Rate is the interest rate a company would have to pay to borrow funds over a similar period, with similar security, and for an amount equal to the lease payments in the same economic environment.

Since every company has a different financial profile, there is no universal borrowing rate. Factors such as creditworthiness, loan tenure, collateral, and market conditions all influence the final rate.

Why Is It Important?

Choosing the correct discount rate directly affects lease accounting. Even a small change in the rate can significantly impact the present value of lease payments and the reported lease liability.

An accurate borrowing rate helps organizations:

• Prepare reliable financial statements
• Comply with accounting standards
• Improve financial transparency
• Support audit requirements
• Reduce compliance risks

Because of these reasons, companies should carefully document the assumptions used while estimating the rate.

Step 1: Understand the Lease Terms

Before calculating any borrowing rate, carefully review the lease agreement. Important details include:

Lease Duration

Identify the total lease period, including renewal options that are reasonably certain to be exercised.

Payment Schedule

Understand whether lease payments are monthly, quarterly, or annually.

Lease Amount

Calculate the total value of future lease payments that require discounting.

These details form the basis for estimating an appropriate borrowing rate.

Step 2: Evaluate the Company's Credit Risk

Every borrower has a different credit profile. A financially strong company generally receives lower borrowing costs than a company with higher financial risk.

Consider factors such as:

• Business profitability
• Cash flow stability
• Existing debt obligations
• Credit history
• Industry performance

Lenders evaluate these factors before deciding the interest rate they are willing to offer.

Step 3: Determine the Borrowing Tenure

The loan period should closely match the lease term.

For example:

• A three-year lease should generally use a borrowing rate for a similar three-year borrowing.
• A ten-year lease should not use a short-term loan rate.

Matching the borrowing period improves the accuracy of the valuation.

Step 4: Consider the Security of the Borrowing

The type of borrowing also affects interest rates.

A secured loan usually carries a lower interest rate because assets are pledged as collateral. An unsecured borrowing generally attracts a higher rate due to increased lender risk.

While estimating the Incremental Borrowing Rate, companies should consider whether the hypothetical borrowing would be secured in a manner similar to the leased asset.

Step 5: Review Current Market Interest Rates

Market conditions constantly change due to inflation, central bank policies, and economic growth.

Useful market references include:

• Bank lending rates
• Corporate loan rates
• Government bond yields
• Financial institution lending data
• Industry borrowing benchmarks

Using recent market information helps ensure the estimated rate reflects current economic conditions.

Step 6: Make Necessary Adjustments

Rarely will an available market rate perfectly match the lease.

Adjustments may be needed for:

Company Size

Smaller businesses often pay higher borrowing costs than large corporations.

Industry Risk

Some industries face greater business risks, leading to higher financing costs.

Geographical Location

Interest rates vary across countries due to differences in economic conditions and monetary policy.

Collateral Differences

Rates should reflect whether the borrowing is secured or unsecured.

These adjustments improve the reliability of the estimated borrowing rate.

Step 7: Calculate the Final Rate

Once all relevant information has been gathered, combine the market data with company-specific adjustments to estimate the most appropriate borrowing rate.

The selected rate should represent the amount the company would realistically pay if it borrowed funds today under conditions similar to the lease.

Proper documentation should explain:

• Data sources
• Market assumptions
• Credit assessment
• Adjustment methodology
• Final justification

Clear documentation makes future audits much smoother.

Common Challenges

Many businesses face practical difficulties while estimating borrowing rates.

Limited Borrowing History

New businesses may not have previous loans that can be used as references.

Changing Market Conditions

Interest rates can change rapidly due to economic developments.

Different Lease Structures

Each lease may involve unique payment schedules or renewal options.

Lack of Comparable Borrowings

Finding loans with similar tenure, security, and amount is often challenging.

Professional judgment is frequently required to address these issues.

Best Practices for Accurate Estimation

Organizations can improve the quality of their estimates by following several best practices.

Maintain Updated Market Data

Regularly monitor lending rates and financial market trends.

Use Reliable Financial Information

Always rely on current financial statements and verified market sources.

Document Every Assumption

Maintain detailed records supporting every adjustment and calculation.

Review Estimates Periodically

Business conditions and market environments change over time. Periodic reviews help maintain consistency in future lease accounting.

Seek Professional Support When Needed

Complex lease portfolios or unusual financing arrangements may require assistance from valuation or accounting professionals.

Common Mistakes to Avoid

Companies should avoid several common errors during the estimation process.

• Using outdated interest rates
• Ignoring differences in loan security
• Selecting a borrowing period that does not match the lease term
• Overlooking company-specific credit risk
• Failing to document assumptions

Avoiding these mistakes improves compliance and reduces audit observations.

Conclusion

Determining an Incremental Borrowing Rate requires careful analysis rather than selecting a standard market interest rate. Businesses must evaluate lease terms, borrowing tenure, credit profile, security, market conditions, and appropriate adjustments before arriving at a reasonable estimate. A well-supported borrowing rate improves financial reporting accuracy, strengthens compliance with accounting standards, and enhances the reliability of lease valuations. By following a structured step-by-step approach and maintaining proper documentation, organizations can confidently determine borrowing rates that reflect their actual financing circumstances and support transparent financial reporting.