What depreciation methods are there?

Common methods include straight-line, declining balance (including double declining), units of production (activity), and sum-of-years-digits.

Which method should I use?

Depends on the asset and jurisdiction. Straight-line is simplest; declining balance front-loads expense; units of production ties expense to use.

Not for all methods. Straight-line and SYD typically use (cost - salvage); some declining balance methods may not assume salvage.

Overview of depreciation calculator types: straight-line, declining balance, units of production, sum-of-years-digits, and more.

Depreciation calculator types

Straight-line depreciation: cost, salvage, useful life → equal annual amount.
Declining balance: cost, salvage, life, rate → depreciation as a percentage of remaining book value.
Double declining balance (DDB): 200% of straight-line rate applied to book value.
Units of production (activity): cost, salvage, total units, units used → expense proportional to use.
Sum-of-years-digits (SYD): front-loaded schedule that fully depreciates to salvage over life.
Real estate / property: straight-line over recovery period (e.g. 27.5 or 39 years).

What depreciation methods are there?: Common methods include straight-line, declining balance (including double declining), units of production (activity), and sum-of-years-digits.
Which method should I use?: Depends on the asset and jurisdiction. Straight-line is simplest; declining balance front-loads expense; units of production ties expense to use.
Is salvage value required?: Not for all methods. Straight-line and SYD typically use (cost - salvage); some declining balance methods may not assume salvage.

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