Equipment fleet componentisation and depreciation of idle plant · IAS 16

In plain words

A crawler crane has parts that wear out at different speeds: the structure, the engine and the tracks. The question is how to depreciate such equipment, including when it sits idle. Each significant part is depreciated separately over its own life, and on a major overhaul the old part's carrying amount is removed. Depreciation continues while equipment is temporarily idle, but idling may change useful life and can signal impairment.

Why it matters

Depreciating a crane's engine, undercarriage and main structure as a single asset over one useful life masks the reality that these components wear out at different rates, and continuing full depreciation on equipment idled for an extended period overstates cost of ownership on unused assets while potentially understating true wear on assets actually in service, both distort reported margins and net book value of the fleet, which is a key covenant metric for asset-heavy contractors.

Diagnostic questions

Does a piece of heavy plant have significant components, such as an engine or undercarriage, with a cost significant to the total and a useful life or consumption pattern materially different from the asset as a whole? Is equipment idled between project awards continuing to be depreciated on the same basis as when in active use, rather than depreciation being incorrectly suspended during idle periods? Would a units-of-production method based on operating hours better reflect a component's consumption pattern than straight-line, given highly variable utilization across projects? Has the componentization and useful-life split been revisited at the time of a major overhaul or replacement?

Recognition

At initial recognition (or on major overhaul), identify significant components of heavy plant with a cost that is significant relative to the total cost of the item and a useful life or depreciation pattern that differs materially from the item as a whole (e.g. engine, undercarriage, main hydraulic system versus the main structural frame).
Depreciate each significant component separately over its own useful life and using its own appropriate depreciation method.
When a major inspection or overhaul cost that meets the recognition criteria is capitalized, derecognize the remaining carrying amount of the part being replaced or overhauled, regardless of whether it had been depreciated as a separate component previously.
For equipment idled for an extended period, continue depreciation based on the pattern of expected consumption of economic benefits, but reassess whether idling has changed the expected useful life or residual value, and consider whether idling itself is an impairment indicator requiring a separate IAS 36 assessment.
Review useful lives, residual values and depreciation methods for each component at least at each annual reporting date and adjust prospectively for any change in estimate.

Measurement

Select a depreciation method (straight-line, units-of-production based on hours or output) that best reflects the pattern of consumption of each component's economic benefits, and continue depreciation even when the asset is temporarily idle, unless the asset is fully depreciated or classified as held for sale, depreciation ceases only when the asset is derecognized or its residual value exceeds its carrying amount, not merely because it is not currently in active use. For idle equipment, reassess whether the units-of-production basis still appropriately reflects the pattern of benefit consumption or whether a time-based method has become more appropriate given prolonged non-use.

Presentation & disclosure

Disclose: (1) depreciation methods and useful lives (or rates) applied to each significant component class of heavy plant; (2) the amount of depreciation charged on idle or underutilized equipment during the period; (3) carrying amount of equipment temporarily idle; (4) reconciliation of carrying amounts showing additions (including capitalized overhauls), disposals, derecognized replaced components, and depreciation; (5) any change in estimated useful life, residual value or depreciation method and its effect on the current and future periods.

Common mistakes

Depreciating a crane or piling rig as a single undifferentiated asset over one blended useful life instead of componentizing the engine, undercarriage and major hydraulic systems separately
failing to derecognize the carrying amount of a replaced component when a major overhaul is capitalized, causing double counting of cost
suspending depreciation entirely on idle equipment on the assumption that '
no use means no depreciation,'
when depreciation should continue based on the pattern of expected benefit consumption unless the asset is fully depreciated
not investigating whether prolonged idling is itself an IAS 36 impairment indicator requiring a separate recoverable amount assessment.

Simple example

A contractor purchases a crawler crane for SAR 10,000,000, componentized at acquisition into: main structure SAR 6,000,000 (15-year useful life, straight-line), engine SAR 2,500,000 (units-of-production over an estimated 20,000 operating hours), and undercarriage/tracks SAR 1,500,000 (8-year useful life, straight-line, given heavier wear).
Journal entry at acquisition:
Dr PP&E - crane main structure 6,000,000
Dr PP&E - crane engine 2,500,000
Dr PP&E - crane undercarriage 1,500,000
Cr Cash / accounts payable 10,000,000
Year 1 depreciation: main structure 6,000,000/15 = 400,000; engine used 2,500 hours out of 20,000 total = 2,500,000 x (2,500/20,000) = 312,500; undercarriage 1,500,000/8 = 187,500:
Dr Depreciation expense 900,000
Cr Accumulated depreciation - crane components 900,000
In year 4, the engine is overhauled for SAR 900,000, meeting the capitalization criteria, when its remaining carrying amount is SAR 1,300,000:
Dr PP&E - crane engine (new overhaul cost) 900,000
Dr Loss on derecognition of replaced engine component (P&L) 1,300,000
Cr PP&E - crane engine (old component, derecognized) 1,300,000
Cr Cash / accounts payable 900,000

Professional judgment

Determining the threshold for what counts as a 'significant' component requiring separate depreciation (versus an immaterial part not warranting separate tracking) is a judgment call that should be applied through a consistent company policy rather than case-by-case, since over-componentization creates excessive administrative burden while under-componentization masks materially different consumption patterns. Selecting units-of-production for components used intensively and unevenly across projects requires reliable usage-hour data by individual asset, which many contractors do not track rigorously, forcing a judgmental fallback to a time-based method that may be less representative. Whether prolonged idling constitutes a genuine change in expected useful life/pattern of use (requiring prospective adjustment) versus a temporary lull expected to reverse also requires judgment informed by the entity's actual order book and redeployment plans.

Source basis

IAS 16 · Property, Plant and Equipment

Paragraph references

IAS 16.43–44IAS 16.51IAS 16.55

Verified against the official standard texts used in the IFRS Expert skill.

IAS 16 Property, Plant and Equipment

Issued: December 2003 (revised) · Effective: 1 January 2005

Related issues

Educational and navigation content only. Not professional advice. Does not reproduce official IFRS/IAS text. Consult the authoritative standards and qualified professionals; professional judgment may still be required.