利润计量与折旧的计算（Depreciation）

核心概念与定义

Depreciation is a fundamental concept in financial accounting, representing the allocation of the cost (or fair value) of non-current assets over their useful lives. This process reflects the portion of the asset consumed in generating revenue during each accounting period.

• Depreciation: The systematic allocation of the cost of a tangible asset over its useful life.

• Applicable Assets: Tangible assets (Property, Plant, and Equipment, PPE) and intangible assets (termed amortisation for intangibles).

• Exclusions: Land (freehold land) and goodwill are generally not depreciated due to their indefinite useful lives.

• Deferred Expense: Depreciation is a deferred expense; cash is paid upfront, but the expense is recognized gradually.

• Financial Statement Impact: Depreciation appears as an expense in the income statement and reduces the asset's carrying value in the balance sheet.

折旧的四大决定因素 (Four Key Factors of Depreciation)

• Asset Cost / Fair Value: The initial amount paid or the market value at acquisition. Includes all expenditures necessary to bring the asset to its intended location and condition (e.g., freight, installation, legal fees).

• Useful Life: The expected period during which the asset will remain productive for the enterprise. Determined by economic life, not physical life, and is influenced by technological changes and market conditions.

• Estimated Residual Value: The expected value of the asset at the end of its useful life, based on historical disposal experience.

• Depreciation Method: The approach used to allocate the depreciable amount over the asset's useful life.

资产成本的组成 (Components of Asset Cost)

• Includes purchase price, transportation, installation, and improvement costs.

• Excludes operating expenses (e.g., fuel, registration fees not related to asset readiness).

• Improvements that enhance value or utility are capitalized.

• Fair value is used for revalued assets; depreciation must be based on fair value if revaluation occurs.

Example: Asset Cost Calculation

• Purchase price: $48,000

• Freight: $1,000

• Alloy wheels: $1,320

• Sunroof: $400

• License: $400

• Total cost: $51,120

• Operating expenses (e.g., fuel $60, registration $1,000) are not included in asset cost.

使用寿命的类型 (Types of Useful Life)

• Physical Life: Duration until asset is unusable due to wear and tear.

• Economic Life: Period during which the asset remains commercially valuable; often shorter than physical life.

• Useful Life to Enterprise: The period the asset is expected to be useful to the specific business.

• Depreciation uses economic life as the basis for allocation.

预计残值 (Estimated Residual Value)

• Amount expected to be received upon disposal of the asset.

• Depreciable amount = Cost - Estimated Residual Value

折旧方法 (Depreciation Methods)

Different methods are used to allocate the depreciable amount over the asset's useful life, each affecting profit measurement differently.

• Straight-Line Method: Equal depreciation expense each year.

• Reducing-Balance Method: Higher depreciation in early years, lower in later years; uses a fixed percentage applied to the opening carrying value.

• Units of Production Method: Depreciation based on actual usage (e.g., mileage, output).

Example: Straight-Line Method

• Asset cost: $40,000

• Residual value: $1,024

• Useful life: 4 years

• Depreciable amount: $40,000 - $1,024 = $38,976

• Annual depreciation: $38,976 / 4 = $9,744

• After 2 years: Accumulated depreciation = $9,744 × 2 = $19,488; Carrying value = $40,000 - $19,488 = $20,512

Example: Reducing-Balance Method

• Depreciation rate: 60%

• Year 1: $40,000 × 0.6 = $24,000; Carrying value = $16,000

• Year 2: $16,000 × 0.6 = $9,600

Depreciation Rate Formula (Reducing-Balance Method)

• Depreciation rate is calculated as:

• Where = depreciation rate, = useful life (years), = residual value, = cost.

折旧方法对利润的影响 (Impact of Depreciation Methods on Profit)

• Straight-line method results in stable annual profit.

• Reducing-balance method causes profit to fluctuate: higher depreciation (and lower profit) in early years, lower depreciation (and higher profit) in later years.

• Total depreciation and total profit over the asset's life are the same for both methods; only the timing differs.

折旧方法的选择 (Choosing Depreciation Methods)

• Choose based on asset's consumption pattern:

• Uniform consumption (e.g., buildings): Straight-line method.

• Declining efficiency (e.g., machinery): Reducing-balance method.

• Usage-based consumption: Units of production method.

• If consumption pattern is uncertain: Straight-line method is commonly used.

• International standards require annual review of useful life, depreciation method, and residual value.

减值与折旧 (Impairment and Depreciation)

• All non-current assets must undergo impairment testing.

• If impaired, carrying value is reduced to recoverable amount.

• Future depreciation is based on the impaired value, not original carrying value.

折旧与固定资产更新 (Depreciation and Asset Replacement)

• Depreciation does not reserve funds for asset replacement; it is merely a cost allocation.

• Asset replacement decisions are independent of depreciation expense.

折旧与职业判断 (Depreciation and Professional Judgment)

• Estimating residual value, useful life, and choosing depreciation method require significant judgment.

• Errors in estimation are corrected in the year of asset disposal through disposal gains or losses.

折旧额的计算 (Depreciation Calculation)

• Annual depreciation = (Cost - Estimated Residual Value) / Useful Life

• Example: If residual value is $8,000, annual depreciation = ($40,000 - $8,000) / 4 = $8,000

• If residual value is $0, annual depreciation = $40,000 / 4 = $10,000

资产处置与调整 (Asset Disposal and Adjustments)

• If actual sale price is less than estimated residual value: record a disposal loss.

• If actual sale price is greater: record a disposal gain.

• Adjustments are made in the period of asset disposal.

影响折旧政策的因素 (Factors Affecting Depreciation Policy)

• Expected useful life and usage pattern

• Estimated residual value

• Technological changes and asset obsolescence

• Regulatory requirements

• Maintenance costs

• Market conditions affecting resale value

记忆口诀 (Mnemonic)

• Cost (or fair value) - Residual value = Depreciable amount

• Useful life + Depreciation method = Determines allocation

• Straight-line = Equal annual depreciation

• Reducing-balance = Higher early depreciation

• Units of production = Usage-based depreciation

• Depreciation ≠ Saving for asset replacement; it is cost allocation only.

HTML Table: Comparison of Depreciation Methods

Additional info: Expanded explanations and examples have been added for clarity and completeness, including formulas and a comparison table for depreciation methods.