Amortization
Amortization is the systematic allocation of a capital asset's cost, less its residual value, over the asset's estimated useful life. Rather than expensing the full cost in the year of purchase, an organization recognizes a portion each period as an amortization expense, which steadily reduces the asset's net book value. In Canadian public sector accounting (PSAB PS 3150), tangible capital assets are amortized in a rational and systematic manner - most commonly straight-line - over their useful lives. In this context amortization and depreciation describe the same idea; PSAB uses the term amortization.
Key Points
- Spreads an asset’s cost over its useful life instead of expensing it at once
- Straight-line is the most common method in public sector accounting
- Accumulated amortization is the running total charged to date
- Net book value = cost − accumulated amortization
- PSAB uses "amortization"; private-sector accounting often says "depreciation"
Formula
Example
Scenario: A municipality acquires a pumper truck for $600,000 with an estimated residual value of $60,000 and a useful life of 15 years, amortized straight-line.
Result: The truck is charged $36,000 of amortization each year. After 5 years, accumulated amortization is $180,000 and net book value is $420,000.
Straight-Line vs Other Methods
Several methods exist for allocating an asset's cost. Public sector bodies overwhelmingly use straight-line for its simplicity and defensibility:
Straight-Line
Equal expense each year over the useful life. Predictable, easy to audit, and the standard choice under PSAB.
Declining Balance / Units
Accelerated or usage-based methods that front-load expense or tie it to output. More common in private-sector reporting.
Accumulated Amortization and Net Book Value
Each year of amortization adds to accumulated amortization - the running total of expense recognized since the asset went into service. Net book value is the asset’s cost minus accumulated amortization, and it is the figure reported on the statement of financial position. Net book value is an accounting measure, not a market value or a condition score: an asset can be fully amortized (net book value at residual) yet still be in service, which is exactly why condition data, not book value, should drive replacement decisions.
Amortization in Capital Planning
The useful life that determines amortization is also a strong first signal of when an asset will need replacement. Forecasting end-of-life from in-service date and useful life turns an accounting input into a capital-planning output. Condition assessments then refine that estimate - an asset in good condition may run past its book life, while a deteriorating one may need replacement sooner - so the renewal forecast is driven by reality, not just the amortization schedule.
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