What is the formula for calculating depreciation using the straight-line method?

The formula for calculating depreciation using the straight-line method is based on the idea of allocating the cost of an asset evenly over its useful life. To compute straight-line depreciation, you take the initial cost of the asset and subtract its estimated salvage value, which is the value expected at the end of its useful life. This difference represents the total amount that will be depreciated over the asset's useful life.

By dividing this depreciable amount by the asset's useful life, you arrive at the annual depreciation expense. This method is widely used due to its simplicity and consistency, allowing businesses to predict their expenses accurately over time. Thus, the correct formulation of this method is (Cost - Salvage) / Useful life.