Advantages of Straight Line Method

The Straight Line Method is popular largely because it is the simplest depreciation method to understand and apply. You calculate a fixed annual depreciation amount by dividing the asset’s depreciable cost (cost minus scrap value) by its estimated useful life. No complex calculations or changing rates are needed each year, which makes it a practical choice for many businesses.

Because the same amount is charged to the Profit and Loss Account every year, the profits of different years become directly comparable. A manager or investor can look at the net profit figures across several years and know that the depreciation charge has not distorted the trend — the expense is constant. This comparability is a significant advantage when analysing financial performance over time.

The method also allows the asset to be depreciated fully down to its net scrap value, or even to zero if no scrap value exists. This means the entire depreciable cost of the asset is systematically allocated over its useful life. No portion of the cost remains unexpired at the end, which gives a clean and complete charge against revenue.

Straight Line method is especially suitable for assets whose useful life can be estimated with reasonable accuracy and whose usage is consistent from year to year. Leasehold buildings are a classic example — the lease term is fixed, and the benefit from the building is spread evenly over that period. For such assets, a constant annual depreciation charge matches the pattern of economic benefit.