Lease return conditions

At the end of an aircraft lease, the lessor wants an aircraft it can place with the next airline without paying for overdue maintenance. Return conditions make the departing airline bear that cost, and it can run to millions of dollars per aircraft. The accounting question is when the airline recognises it: as the aircraft is flown, or only when the return approaches. This guide explains typical return conditions, builds up a provision over an eight-year lease, and covers the interaction with maintenance reserves and the right-of-use asset, changes in estimates, lease extensions and US GAAP.

By Muhammad Bilal, Chartered Accountant. Reviewed by Awais Jameel, Chartered Accountant. 4 minute read.

Short answer

Lease return conditions require an airline to hand a leased aircraft back in a specified state: engines and landing gear with a minimum life remaining since their last overhaul, airframe checks recently completed, fresh paint and complete records, or to pay the lessor compensation instead. Under IFRS, an obligation that exists from the start of the lease, such as removing modifications made at delivery, is part of the cost of the right-of-use asset. Obligations that build up as the aircraft is flown are provided for under IAS 37 as the wear occurs, usually through maintenance expense based on flight hours or cycles, measured at the expected cost of meeting the conditions and discounted. Maintenance reserves the lessor will keep in place of compensation reduce the provision. In this guide's example, a US$ 5.2 million return cost is built up over an 8-year lease, with the discounted provision reaching 0.46 million after the first year.

At a glance

Obligation at commencement
Part of right-of-use asset cost
Obligation from use
IAS 37 provision as flown
Measurement
Expected cost, discounted
Maintenance reserves kept
Reduce the provision
Lease extension
Remeasure, period lengthens
US GAAP
Often when probable, nearer return
Lease return conditionsObligation at commencement: Part of right-of-use asset cost; Obligation from use: IAS 37 provision as flown; Measurement: Expected cost, discounted; Maintenance reserves kept: Reduce the provision; Lease extension: Remeasure, period lengthens; US GAAP: Often when probable, nearer return.KEY FACTS AT A GLANCELease return conditionsObligation at commencementPart of right-of-useasset costObligation from useIAS 37 provision as flownMeasurementExpected cost, discountedMaintenance reserves keptReduce the provisionLease extensionRemeasure, periodlengthensUS GAAPOften when probable,nearer returnTax BakersLease return conditionsObligation at commencement: Part of right-of-use asset cost; Obligation from use: IAS 37 provision as flown; Measurement: Expected cost, discounted; Maintenance reserves kept: Reduce the provision; Lease extension: Remeasure, period lengthens; US GAAP: Often when probable, nearer return.KEY FACTS AT A GLANCELease return conditionsObligation at commencementPart of right-of-use asset costObligation from useIAS 37 provision as flownMeasurementExpected cost, discountedMaintenance reserves keptReduce the provisionLease extensionRemeasure, period lengthensUS GAAPOften when probable, nearer returnTax Bakers
Key facts at a glance, as set out in this guide.

What are lease return conditions?

Aircraft leases set out the condition the aircraft must be in when it is returned. Typical terms require engines with at least half of their life remaining until the next shop visit, life-limited parts above a minimum, landing gear and the auxiliary power unit within set intervals, the airframe fresh from a specified check, the aircraft repainted in the lessor's colours, the cabin restored to an agreed configuration, and full maintenance records. Where a part falls short, the airline either performs the maintenance or pays compensation, usually a rate per flight hour or cycle short of the requirement. The cost of a return can be several million dollars per aircraft, more if engines need shop visits.

When is a provision for return conditions recognised?

IAS 37 requires a provision when there is a present obligation from a past event. For return conditions, the past event is the use of the aircraft: each flight hour consumes engine and airframe life that the airline will have to restore or pay for at return. So the obligation builds up as the aircraft is flown, and most airlines recognise it through maintenance expense based on hours or cycles. Obligations that exist from commencement, independent of use, such as removing a cabin modification installed at delivery or the cost of the return itself, are part of the cost of the right-of-use asset under IFRS 16 and depreciated over the lease. See IAS 37 provisions.

Return conditions: building the provision

An airline leases an aircraft for 8 years. It expects that, at return, it will need to pay US$ 4.0 million of engine compensation and spend 1.2 million on the airframe check and repainting, 5.2 million in total, in money of the return date. The cost accrues evenly with flying, and the discount rate is 5%.

Return condition provision at each year end (US$ thousand)Return condition provision at each year end (US$ thousand)462Year 1970Year 21,528Year 32,139Year 42,807Year 53,537Year 64,333Year 75,200Year 8Provision
The provision builds up with flying and with the unwinding of the discount.
US$ millionOpening provisionCharge for flyingUnwinding of discountClosing provision
Year 10.000.460.000.46
Year 20.460.490.020.97
Year 30.970.510.051.53
Year 41.530.530.082.14
Year 52.140.560.112.81
Year 62.810.590.143.54
Year 73.540.620.184.33
Year 84.330.650.225.20

Each year's flying adds one eighth of the return cost, discounted to the balance sheet date, as maintenance expense; the unwinding of the discount is a finance cost. By the return date the provision equals the 5.2 million to be paid or spent. Estimates of the cost, the flying hours to return and the condition of each engine are updated every year, and changes adjust the provision, with the effect recognised in profit or loss.

How do maintenance reserves interact with the provision?

Where the airline pays maintenance reserves, the lessor often keeps unused reserves at return in place of compensation. Reserves the airline has expensed because it does not expect to recover them have already paid for part of the return condition, so the provision covers only the shortfall. Where reserves are expected to be reimbursed, the airline is expected to perform the maintenance itself, and the cost is accounted for when the maintenance is done. Getting this interaction right avoids charging the same wear twice.

What if the airline plans maintenance before return anyway?

If the airline expects to carry out a shop visit or heavy check before the aircraft goes back, the cost of that event is accounted for as maintenance when performed, usually capitalised as a component and depreciated over the remaining lease term, and the return provision covers only what is still expected to be owed at return. Airlines often plan the last checks before return to minimise compensation, so the provision is based on the planned approach, updated as plans change. See aircraft components and depreciation.

What happens if the lease is extended?

An extension changes the lease term, so the lease liability and right-of-use asset are remeasured under IFRS 16. It also changes the return obligation: the return moves later, more flying will occur before it, and an engine overhaul might now fall within the lease. The provision is re-estimated on the new plan, and the discounting period lengthens. An early return, by contrast, can bring forward costs and make the remaining provision payable sooner. See lease modifications.

How does US GAAP differ?

US GAAP has no specific requirement to build up return condition costs from the start of the lease. Many US airlines accrue them when they become probable and reasonably estimable, often over the final years of a lease, which concentrates the charge nearer the return date compared with IFRS practice. The underlying lease accounting is covered in aircraft leases under IFRS 16, and the wider picture in airline accounting.

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Questions people ask

When does an airline provide for lease return conditions under IFRS?

As the aircraft is flown, because each flight hour consumes life the airline must restore or pay for at return; obligations existing from commencement are part of the right-of-use asset.

How is a return condition provision measured?

At the expected cost of meeting the conditions or paying compensation at return, discounted, and updated every year.

Do maintenance reserves reduce the return provision?

Yes, where the lessor will keep unused reserves in place of compensation that the airline has already expensed.

Is the treatment the same under US GAAP?

Not always. Many US airlines accrue return costs when they become probable and estimable, often nearer the return date.

Sources

Every fee, date and rule on this page was taken from these official and primary sources.

  1. IFRS Foundation: IAS 37 Provisions, Contingent Liabilities and Contingent Assets
  2. IFRS Foundation: IFRS 16 Leases
  3. IFRS Foundation: IAS 16 Property, Plant and Equipment

Rules and fees change. If you are reading this long after October 9, 2026, confirm the figures with the source before you rely on them.

AirlinesAirline accounting: the key IFRS issuesAirlinesAircraft leases under IFRS 16AirlinesMaintenance reserves and checks

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This guide is general information. It is not tax or legal advice for your situation.