Overview of Depreciation
Depreciation is the systematic reduction in the recorded cost of a fixed asset. Examples of fixed assets that can be depreciated are buildings, furniture, leasehold improvements, and office equipment. The only exception is land, which is not depreciated. The reason for using depreciation is to match a portion of the cost of a fixed asset to the revenue that it generates; this is mandated under the matching principle, where you record revenues with their associated expenses in the same reporting period in order to give a complete picture of the results of a revenue-generating transaction.
It is very difficult to directly link a fixed asset with a revenue-generating activity, so we do not try - instead, we incur a steady amount of depreciation over the useful life of each fixed asset, so that the remaining cost of the asset on the company's records at the end of its useful life is only its salvage value.
There are three factors to consider in the calculation of depreciation, which are:
Useful life. This is the time period over which the company expects that the asset will be productive. Past its useful life, it is no longer cost-effective to continue operating the asset, so it is expected that the company will dispose of it. Depreciation is recognized over the useful life of an asset.
Salvage value. When a company eventually disposes of an asset, it may be able to sell it for some reduced amount, which is the salvage value. Depreciation is calculated based on the asset cost, less any estimated salvage value. If salvage value is expected to be quite small, then it is generally ignored for the purpose of calculating depreciation.
Depreciation method. You can calculate depreciation expense using an accelerated depreciation method, or evenly over the useful life of the asset. The advantage of using an accelerated method is that you can recognize more depreciation early in the life of a fixed asset, which defers some income tax expense recognition into a later period. The advantage of using a steady depreciation rate is the ease of calculation. Examples of accelerated depreciation methods are the declining balance and sum-of-the-years digits methods. The primary method for steady depreciation is the straight-line method.
If, midway through the useful life of an asset, you expect its useful life or the salvage value to change, you should incorporate the alteration into the calculation of depreciation over the remaining life of the asset; do not retrospectively change any depreciation that has already been recorded.
Depreciation Journal Entries
When you record depreciation, it is a debit to the Depreciation Expense account, and a credit to the Accumulated Depreciation account. The Accumulated Depreciation account is a contra account, which means that it appears on the balance sheet as a deduction from the original purchase price of an asset.
Once you dispose of an asset, you credit the Fixed Asset account in which the asset was originally recorded, and debit the Accumulated Depreciation account, thereby flushing the asset out of the balance sheet.
Other Depreciation Issues
Depreciation has nothing to do with the market value of a fixed asset, which may vary considerably from the net cost of the asset at any given time.
Depreciation is a major issue in the calculation of a company's cash flows, because it is included in the calculation of net income, but does not involve any cash flow. Thus, a cash flow analysis calls for the inclusion of net income, with an add-back for any depreciation recognized as expense during the period.
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