The adoption of IFRS 16 has significantly transformed lease accounting, requiring companies to bring most leases onto the balance sheet. One of the most critical and often misunderstood elements of this standard is the Incremental Borrowing Rate. For many organizations, determining the correct Incremental Borrowing Rate can be complex, yet it plays a vital role in accurately measuring lease liabilities.

This article explains the concept in simple, practical terms, helping finance professionals, students, and business owners understand how it works and why it matters.

What is Incremental Borrowing Rate?

Simple Definition

The Incremental Borrowing Rate is the interest rate that a company would have to pay to borrow money, over a similar term and with similar security, to obtain an asset of similar value.

In other words, it answers this question:
If the company didn’t lease the asset, what interest rate would it pay to borrow funds to buy it?

Why It Matters

Under IFRS 16, lease liabilities are measured by discounting future lease payments. The discount rate used is either:

• The interest rate implicit in the lease (if readily available), or
• The Incremental Borrowing Rate (more commonly used)

This makes the Incremental Borrowing Rate a key assumption that directly affects financial statements.

Why IFRS 16 Requires Incremental Borrowing Rate

Shift from IAS 17 to IFRS 16

Previously under IAS 17, many leases were off-balance sheet. IFRS 16 changed that by requiring:

• Recognition of a lease liability
• Recognition of a right-of-use asset

To calculate the lease liability, future payments must be discounted—and this is where the Incremental Borrowing Rate becomes essential.

Impact on Financial Reporting

The choice of Incremental Borrowing Rate affects:

• Lease liability value
• Interest expense
• Asset depreciation
• Profit and loss statement

A higher Incremental Borrowing Rate results in a lower lease liability, while a lower rate increases it.

Key Components of Incremental Borrowing Rate

1. Borrowing Term

The rate should reflect the duration of the lease. A 3-year lease will have a different rate compared to a 10-year lease.

2. Security Level

If the lease is secured (backed by an asset), the Incremental Borrowing Rate should reflect a secured borrowing rate, not an unsecured one.

3. Economic Environment

The rate must consider the country, currency, and market conditions in which the company operates.

4. Company Credit Risk

Each company has a different credit profile. A financially strong company will have a lower Incremental Borrowing Rate compared to a riskier one.

How to Calculate Incremental Borrowing Rate

Step-by-Step Approach

Step 1: Identify a Base Rate

Start with a risk-free rate such as government bond yields for a similar term.

Step 2: Add Credit Spread

Adjust for the company’s credit risk. This reflects the additional interest lenders would demand.

Step 3: Adjust for Lease-Specific Factors

Consider:

• Asset type
• Lease term
• Security level

Step 4: Finalize the Rate

Combine all factors to determine the final Incremental Borrowing Rate.

Practical Example

Suppose a company leases machinery for 5 years:

• Risk-free rate: 6%
• Credit spread: 3%
• Adjustments: 1%

Final Incremental Borrowing Rate = 10%

This rate will be used to discount lease payments.

Challenges in Determining Incremental Borrowing Rate

Lack of Observable Data

Many companies do not frequently borrow funds, making it difficult to determine a realistic Incremental Borrowing Rate.

Subjectivity

The calculation involves judgment, especially when estimating credit spreads and adjustments.

Different Rates for Different Leases

Companies may need multiple Incremental Borrowing Rate values depending on:

• Lease terms
• Asset classes
• Geographic regions

Best Practices for Using Incremental Borrowing Rate

Use Consistent Methodology

Apply a consistent framework across all leases to ensure comparability and audit compliance.

Leverage External Data

Use market data, bank quotes, or yield curves to support your Incremental Borrowing Rate assumptions.

Document Assumptions

Maintain clear documentation explaining how the rate was derived. This is crucial for audits.

Review Regularly

Market conditions change, so the Incremental Borrowing Rate should be reassessed periodically.

Common Mistakes to Avoid

Using a Single Rate for All Leases

Not all leases are the same. Applying one Incremental Borrowing Rate across all leases can lead to inaccurate reporting.

Ignoring Lease Term Differences

Short-term and long-term leases should have different rates.

Overlooking Security Adjustments

Failing to consider whether the lease is secured can distort the Incremental Borrowing Rate.

Conclusion

The Incremental Borrowing Rate is a fundamental concept under IFRS 16 that directly influences how lease liabilities are measured and reported. While it may seem technical, understanding its core idea—estimating the rate at which a company would borrow funds under similar conditions—makes it much easier to apply.

By focusing on key factors such as lease term, credit risk, and economic environment, companies can determine a reliable Incremental Borrowing Rate. With proper methodology, documentation, and periodic review, organizations can ensure compliance and improve the accuracy of their financial statements.

Ultimately, mastering the Incremental Borrowing Rate not only helps in meeting accounting standards but also enhances financial transparency and decision-making.