To calculate the weighted average discount rate for leases under ASC 842, multiply each lease’s discount rate by its remaining undiscounted lease payments, add the products together, and divide the total by the sum of remaining payments across the portfolio. The result is a single percentage that summarizes the interest rates embedded in your lease book, weighted so larger leases pull the number more than smaller ones. Lessees disclose this figure separately for operating leases and finance leases in the quantitative lease footnote.
What You Need for Each Lease
Two inputs drive the whole calculation: the discount rate assigned to the lease and the remaining balance of undiscounted lease payments as of the reporting date. ASC 842-20-55-12 is explicit that the weighting factor is remaining lease payments, not the lease liability. The lease liability is the present value of those payments after discounting, so it is a smaller number. Substituting it changes the weights and produces a wrong answer.1Deloitte Accounting Research Tool (DART). Lessee Disclosure Requirements – Section: 15.2.4.10 Weighted-Average Discount Rate
Pull the rate that was locked in at commencement (or at the most recent remeasurement) and the total future payments still owed under the contract at the reporting date. Both figures live in your lease amortization schedules or lease software. Fixed payments always count. Payments that depend on an index or rate are included at the index or rate in effect at the reporting date. Variable payments tied to usage or performance are excluded, because they never entered the lease liability to begin with.
Leases elected under the short-term lease exemption (12 months or less at commencement) carry no recognized liability and no assigned discount rate, so they do not appear in the calculation at all.
Which Discount Rate Applies to Each Lease
ASC 842-20-30-3 sets a hierarchy. Use the rate implicit in the lease when you can determine it, and fall back to the incremental borrowing rate when you cannot.2Deloitte Accounting Research Tool. ASC 842-20 – Determination of the Discount Rate for Lessees The implicit rate is essentially the lessor’s expected yield, and computing it requires the fair value of the underlying asset, the lessor’s initial direct costs, and the expected residual value. Lessees rarely have all of those inputs, so most companies default to the incremental borrowing rate.
The incremental borrowing rate is what your company would pay to borrow on a collateralized basis over a comparable term, in a similar economic environment, for an amount equal to the lease payments. Assume the leased asset itself serves as collateral, which typically produces a lower rate than unsecured borrowing.
Non-public entities have a third option under ASC 842-20-30-3: elect a risk-free discount rate over a period comparable to the lease term. The election is made by class of underlying asset, so you can use the risk-free rate for real estate leases and the IBR for equipment. Risk-free rates run lower than borrowing rates, which produces larger liabilities and right-of-use assets on the balance sheet.
The Calculation, With Numbers
Take three leases:
- Lease A: 4.5% rate, $600,000 remaining payments. Product: $27,000.
- Lease B: 5.8% rate, $1,200,000 remaining payments. Product: $69,600.
- Lease C: 3.2% rate, $200,000 remaining payments. Product: $6,400.
Total remaining payments across the portfolio: $2,000,000. Sum of products: $103,000. Divide $103,000 by $2,000,000 for 0.0515, or 5.15%. That is the weighted average discount rate. Lease B dominates because it represents 60% of the total remaining payments.1Deloitte Accounting Research Tool (DART). Lessee Disclosure Requirements – Section: 15.2.4.10 Weighted-Average Discount Rate
In a spreadsheet, this is a SUMPRODUCT of rate and payments divided by SUM of payments. Carry at least four decimal places through intermediate steps. Rounding each product before summing introduces small errors that compound across a portfolio of dozens or hundreds of leases, and the disclosed rate has to hold up to auditor review.
The Mistake That Trips People Up
The most common error is weighting by lease liability balance instead of by remaining lease payments. It happens because the liability is the number sitting on the balance sheet and the number accountants interact with every day. ASC 842-20-55-12 calls for the undiscounted remaining payments.1Deloitte Accounting Research Tool (DART). Lessee Disclosure Requirements – Section: 15.2.4.10 Weighted-Average Discount Rate Using the liability shifts the relative weight of each lease, because leases with higher rates have larger gaps between undiscounted payments and present-value liability. The distortion is small when rates across the portfolio are similar and grows as the spread widens.
When a Lease’s Rate Changes Mid-Term
A lease’s discount rate is not always fixed for the full term. Under ASC 842-20-35-5, a lessee generally updates the discount rate at a remeasurement date based on the remaining term and remaining payments. Triggers include a change in the assessment of the lease term, a reassessment of a purchase option, and certain other events.3DART – Deloitte Accounting Research Tool. 8.5 Remeasurement of the Lease Liability One exception: if the original rate already reflected the option in question, the rate stays as-is.
Modifications work similarly. A modification that grants an additional right of use at a commensurate price is treated as a separate contract with its own rate. A modification that changes the term or payments of an existing lease triggers a remeasurement of that lease at a revised rate.4Deloitte. 8.6 Lease Modifications Whatever rate is currently assigned to each lease is what flows into the next period’s WADR calculation.
Disclosing the Result
ASC 842-20-50-4(g)(4) requires lessees to disclose the WADR in the quantitative lease footnote, reported separately for operating leases and finance leases.5U.S. Securities and Exchange Commission. Lease Disclosure Data Structure for Weighted Average Discount Rate If every lease sits in one category, one figure is enough; most companies with any scale report both.6Deloitte Accounting Research Tool (DART). Lessee Disclosure Requirements
The metric is period-end, so recalculate it every reporting period. New leases added during the quarter, leases that expired and dropped off, and any remeasured rates all feed the updated number. The WADR typically appears alongside the weighted average remaining lease term, giving readers a paired view of how long the obligations run and at what effective cost.5U.S. Securities and Exchange Commission. Lease Disclosure Data Structure for Weighted Average Discount Rate