Technical definition
Systematic allocation of a tangible asset's depreciable amount over its useful life.
How it works
Depreciation matches the asset's cost with periods receiving benefit. Straight-line depreciation divides cost less residual value by useful life. The entry debits depreciation expense and credits accumulated depreciation.
Everyday example
Cost 26,000, residual value 2,000 and six-year life produce annual straight-line depreciation of $4,000.
Common pitfall
Depreciation is cost allocation, not a direct estimate of market-value decline and not a cash payment.