The useful life of a fixed asset is an estimate based on management's expectation of how long the asset will remain productive or economically viable for the business. Because it is impossible to predict the exact moment an asset will cease to be useful, accountants use professional judgment and historical data to estimate this period, which is then used to allocate the asset's cost systematically.

Depreciation is the systematic allocation of the cost of tangible fixed assets over their useful lives to reflect their wear and tear, obsolescence, or usage. While other terms like amortization apply to intangible assets and depletion to natural resources, depreciation is the specific term used for tangible fixed assets like machinery, buildings, and equipment.

Depreciation represents the systematic allocation of the cost of a tangible asset over its useful life. It reflects the decline in value due to wear and tear, obsolescence, or passage of time. When the closing book value is lower than the opening book value, the difference is typically recognized as depreciation expense in the financial statements.

Standard accounting practices recognize methods like Straight Line, Written Down Value, and Sum of Years' Digits for allocating the cost of tangible assets. Discounted present value is a financial valuation technique used for investment appraisal or asset valuation, but it is not a recognized method for calculating periodic depreciation expense in financial accounting.

Depreciation is the systematic allocation of the cost of a tangible asset over its useful life. It reflects the decline in value due to usage, wear and tear, or obsolescence, ensuring that the expense is matched against the revenue generated by the asset.

Depreciation is a mandatory expense that must be recorded regardless of whether the business makes a profit or incurs a loss. As a charge against profit, it is deducted in the Profit and Loss account to determine the net operating result, ensuring that the cost of using long-term assets is matched against the revenue they help generate.

When using the provision for depreciation method, the asset account is maintained at its original cost price. The accumulated depreciation is recorded in a separate contra-asset account, allowing the historical cost to remain visible on the balance sheet.

The inventory system of depreciation, sometimes called the revaluation or appraisal method, involves assessing the value of an asset at the beginning and end of an accounting period. The difference between these two values represents the depreciation charge for that period, reflecting the actual decline in the asset's market value.

In accounting practice, the term 'Provision for Depreciation' is frequently used to represent the accumulated depreciation account. This account tracks the total amount of depreciation expense allocated to a fixed asset since its acquisition, effectively reducing the asset's book value on the balance sheet over its useful life.

Depreciation is the accounting process of allocating the cost of a tangible asset over its useful life. It reflects the consumption of the asset's economic benefits. By spreading the cost, businesses match expenses to the revenue generated by the asset, ensuring accurate financial reporting. It is not merely a measure of physical wear or market value fluctuations, but a systematic cost allocation method.