MENTAL MODEL · M13075

Depreciation & Amortization

SystemsHigh supportAccounting

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Updated 2026-08-11

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INTRODUCTION

English translation pending.

CORE DEFINITION

Depreciation and amortization are the accounting processes that allocate the cost of long-lived assets over their useful lives, with depreciation applied to tangible fixed assets and amortization to intangible assets. The core principle is matching: revenue in a period should carry the cost of the assets consumed to produce it, rather than charging the whole purchase to the year of payment. The key qualification is that useful life, residual value and method are management choices, so identical firms can report materially different profits. Warren Buffett's 1986 owner earnings concept adds depreciation and amortization back to profit and then subtracts maintenance capital expenditure.

SCAFFOLDING EFFECT

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- Match costs: spread an asset's cost over the years it earns revenue and check whether profit is distorted - Reconstruct cash: add back depreciation, then subtract maintenance capital spending - Compare policy: benchmark useful-life assumptions against peers and question the gap

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Cash for an asset leaves in one period, but the revenue it generates arrives over many, so charging the full cost at purchase would understate current profit and overstate later profit. Depreciation and amortization allocate that cost across the useful life, aligning the revenue of a period with the assets consumed to earn it. Because useful life, residual value and method are management choices, the same allocation opens room to shape earnings: extending a life or switching to an accelerated method redraws the profit curve without changing cash.

MINIMUM ACTION

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Practice this model in one real situation:

Find total depreciation and amortization plus the useful-life assumptions behind fixed and intangible assets. 2. Compare those lives with peers and with the firm's own history, and flag gaps above twenty percent. 3. Add depreciation back to net income, then subtract maintenance capital expenditure to approximate owner earnings. 4. Split capital spending into maintenance and growth portions and treat them separately. 5. If a company extends useful lives, recompute profit under the old assumption to size the effect.

Check to track your progress (stored locally)

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Source support: Explicit

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mungermodels.comhttps://mungermodels.com/models/depreciation-amortizationZH · Explicit
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