Straight-line: This method spreads the cost of the fixed asset evenly over its useful life.
Declining-balance: An accelerated method of depreciation, it results in higher depreciation expense in the earlier years of ownership.
Sum-of-the-years’ digits: Compute depreciation expense by adding all years of the fixed asset’s expected useful life and factoring in which year you are currently in, as compared to the total number of years.
Units-of-production: The total estimated number of units the fixed asset will produce over its expected useful life, as compared to the number of units produced in the current accounting period, is used to calculate depreciation expense.