Quick Summary

• A lease modification is any change to the scope or consideration of a lease that was not part of the original terms — a change in the leased area, a term extension, or a renegotiated price.
• The first question is always whether the modification creates a separate lease. If it does, the original lease is left untouched and a brand-new lease is recognized alongside it.
• If it is not a separate lease, the treatment splits further depending on whether the modification decreases or increases the scope of the lease.
• A scope decrease is the only modification type that produces a gain or loss in profit or loss — every other modification type flows entirely through the right-of-use asset.

What Counts as a Lease Modification?

A lease modification is a change to the scope of a lease, or the consideration for a lease, that was not part of the original terms and conditions — for example, adding or removing floor space, extending or shortening the contractual term outside of an option the lessee already had, or renegotiating the rent independently of any index or rate mechanism already built into the contract.

It is important to distinguish a modification from a remeasurement trigger covered elsewhere in this series: a remeasurement responds to a reassessment of options or variables already in the original contract, while a modification changes the contract itself. The two can occur together, but the accounting analysis for each starts from a different question.

Step 1: Is the Modification a Separate Lease?

A modification is accounted for as a separate lease — meaning the original lease is entirely unaffected and a new lease is recognized on its own terms — only when both of the following are true:

Both conditions must hold together. Adding floor space at a price that is not commensurate with its standalone value — a discounted rate because the lessee is already a tenant, for instance — fails the second condition and is not treated as a separate lease, even though the scope genuinely increased.

Step 2: If Not Separate — a Decrease in Scope (Partial Termination)

Where the modification is not accounted for as a separate lease and it decreases the scope of the lease — surrendering part of a leased floor, or terminating the lease early for part of the underlying asset — the lessee remeasures the lease liability using a revised discount rate, and decreases the carrying amount of the right-of-use asset to reflect the partial or full termination.

The lessee compares the proportionate decrease in the carrying amount of the right-of-use asset to the decrease in the lease liability. Any difference between the two is recognized as a gain or loss in profit or loss at the effective date of the modification.

Step 2 (continued): an Increase in Scope Not Treated as a Separate Lease

Where a modification increases the scope of the lease but is not accounted for as a separate lease — because the added consideration is not commensurate with the standalone price — or the modification simply changes the lease term or the consideration without changing scope at all, the lessee remeasures the lease liability using a revised discount rate and adjusts the right-of-use asset by the full amount of the remeasurement. No gain or loss is recognized in profit or loss for this category of modification; the entire effect is capitalized into the right-of-use asset.

Recognizing the Gain or Loss on a Partial Termination

The gain or loss calculation on a scope decrease is often the step preparers get wrong, because it is not simply “old liability minus new liability.” The correct approach reduces the right-of-use asset in proportion to the reduction in scope — commonly using the reduction in the remaining lease liability as a practical proxy for the proportionate reduction — and then compares that reduction in the asset to the corresponding reduction in the liability. Any mismatch between the two is the gain or loss.

Because the proportion used to reduce the right-of-use asset is a matter of judgment rather than a strict formula, two preparers can reach materially different gain-or-loss figures for the same modification if they use different proxies — a floor-area percentage instead of a liability-based percentage, for example. Documenting the basis for the proportion chosen, and applying it consistently across similar modifications, is worth building into a lessee’s accounting policy rather than deciding case by case.

A Worked Illustration of a Scope Decrease

A lessee leases two floors of an office building under a single lease, with a lease liability carrying amount of $2,000,000 and a right-of-use asset carrying amount of $1,800,000. Partway through the term, the lessee surrenders one of the two floors back to the landlord, reducing the lease liability by 45% (reflecting the smaller footprint and the remaining term) to a revised liability of $1,100,000 — a decrease of $900,000.

The right-of-use asset is reduced proportionately by 45% as well, from $1,800,000 down to $990,000 — a decrease of $810,000. Comparing the two decreases, the lease liability fell by $900,000 while the right-of-use asset fell by only $810,000, so the lessee recognizes a gain of $90,000 in profit or loss at the effective date of the surrender.

Common Mistakes in Applying Lease Modifications

• Skipping the separate-lease test and jumping straight to remeasurement, missing cases where a genuinely new, independent lease should be recognized instead.
• Recognizing a gain or loss on a scope increase or a term/price change, when only a scope decrease produces a profit-or-loss impact.
• Using the original discount rate for a modification remeasurement instead of determining a revised rate as at the effective date of the modification.
• Applying a straight percentage-of-liability cut to the right-of-use asset without checking whether that proportion genuinely reflects the reduction in scope.
• Treating a rent renegotiation driven purely by a market rent review clause already in the contract as a modification, when it is in fact a variable-payment remeasurement trigger covered under the standard’s index-and-rate provisions.