A company depreciates its manufacturing equipment over 15 years. Its nearest competitor depreciates equivalent equipment over 10 years. The equipment is identical. The economic consumption is the same. The reported profit is materially different.
The company with 15-year depreciation charges Rs 6.67 crore per year on a Rs 100 crore asset. The competitor charges Rs 10 crore. The difference, Rs 3.33 crore per year, flows directly to reported profit. Over the life of the asset, the total depreciation is the same. In any given year, the company with the longer useful life reports higher profit without any operational difference.
This is the useful-life problem: the ability of management to change reported profit by changing an accounting assumption (useful life) rather than changing the business.
How Useful Lives Affect Reported Economics
Longer useful life → lower annual depreciation → higher reported profit → higher reported EBITDA (if depreciation is below EBITDA) → lower asset turnover (assets remain on the balance sheet longer) → higher reported net worth (assets depreciate more slowly)
Shorter useful life → higher annual depreciation → lower reported profit → but earlier write-off of the asset → more conservative balance sheet → better matching of cost to economic consumption
The economic reality has not changed. The asset is the same. The cash outflow was the same. The productive capacity is the same. Only the timing of the P&L charge differs.
But the timing matters enormously: to reported earnings, to executive compensation (if linked to profit), to covenant calculations (if based on EBITDA or net worth), to investor valuations (if based on P/E or EV/EBITDA) and to comparability across companies.
The Forensic Test
In Northrop Management Private Limited’s forensic and financial reporting work, useful-life analysis compares the company’s depreciation assumptions to three benchmarks:
Industry peers: What useful lives do comparable companies use for equivalent assets? If the company depreciates over 15 years while peers depreciate over 10, the 5-year difference requires explanation.
Manufacturer recommendations: What is the manufacturer’s expected operational life for the asset? If the manufacturer recommends 10 years and the company depreciates over 15, the company is assuming the asset will last 50% longer than the manufacturer expects.
Actual replacement cycle: When does the company actually replace the asset? If the company depreciates equipment over 15 years but replaces it every 8, the useful-life assumption is not supported by the company’s own replacement behaviour.
A useful-life change should be treated as a significant accounting event. When management extends the useful life of an asset category, the board should understand: what evidence supports the extension? What is the annual P&L impact? And does the extension align with operational reality or with the desire to report higher profit?
Ashish Chaudhary, frames the accounting judgment directly: “Accounting lives can materially alter earnings trajectories without changing a single operational variable. A company that extends its depreciation lives has not become more profitable. It has reduced its annual depreciation charge. The board should know the difference, and should ask whether the extension reflects economic reality or accounting convenience.”
Questions for the Boardroom
- How do our depreciation useful lives compare to industry peers for equivalent asset categories?
- Have we changed any useful-life assumptions in the last three years, and what was the annual P&L impact?
- What is our actual replacement cycle for major asset categories, and does it match the useful life we assume for depreciation purposes?
- If we aligned our useful lives to the industry median, how would reported profit change?
- Is our depreciation policy designed to reflect economic consumption, or to produce a desired level of reported profit?
Closing Implication
The useful-life assumption is one of the most consequential and least scrutinised accounting judgments on the balance sheet. A change of five years in the useful life of a major asset category can shift reported profit by crores per year without any operational change. The board that understands its depreciation assumptions governs with clarity about what is real improvement and what is accounting presentation. The board that does not may be celebrating profit growth that the depreciation policy created, not the business.
