Choice of Depreciation Method and Assumptions


Financial statements and the ratios derived from them may be significantly impacted by a company’s selected depreciation method and accompanying assumptions and estimates.

Companies should review the estimates used on a periodic basis to ensure that they remain reasonable.

The Effect of the Choice of Depreciation Method and Assumptions on Depreciation Expense, Financial Statements, and Financial Ratios

The choice of depreciation method will affect the amounts that are reported on the financial statements, including the amounts for reported assets and operating and net income. Several financial ratios will be affected because of this, including the fixed asset turnover, total asset turnover, operating profit margin, operating return on assets, and return on assets.

In some countries, the same depreciation method is not used for financial reporting and tax purposes. As a result, pre-tax income on the income statement and taxable income on the tax return are likely to differ. The amount of tax expense computed on the basis of pre-tax income and the amount of taxes actually owed on the basis of taxable income may, therefore, be different.

For example, if a company uses the straight-line method of depreciation for financial reporting and an accelerated depreciation method for tax purposes, the company’s financial statements will report lower depreciation expense and higher pre-tax income in the first year, compared with the amount of depreciation expense and taxable income in its tax reporting. The tax expense that is calculated on the basis of the financial statements’ pre-tax income will be higher than taxes payable on the basis of taxable income; the difference between the two amounts is a deferred tax liability. This deferred tax liability will be reduced as the difference reverses i.e. when the depreciation for financial reporting is higher than the depreciation for tax purposes, and the income tax is paid.

Significant estimates are required for calculating depreciation expense. These include the useful life of the asset and the expected residual value at the end of that useful life. A longer useful life and higher expected residual value will decrease the amount of annual depreciation expense relative to a shorter useful life and lower expected residual value.

Question 1

Companies A and B purchase a similar machine at the same time and for the same cost. In reporting this acquisition, company A uses the straight-line method of depreciation, while company B uses the double declining balance method. Other than the choice of depreciation method, both companies use similar estimates and assumptions.

Assuming that the machine is the only long-lived asset that both companies report on their financial statements, which of the following statements is most accurate?

A. Company A will have a higher pre-tax income in the first year, than company B

B. Company A will have a higher depreciation expense in the first year than company B

C. Company A and B will have the same tax expense


The correct answer is A.

Company A will have a higher pre-tax income in the first year, than company B because of its lower depreciation expense under the straight-line method of depreciation. Choice B is incorrect because company A will have the lower depreciation expense. Choice C is also incorrect because company A will have a higher tax expense in the first year due to its higher pre-tax income.

Question 2

How would an increase in the estimated residual value of an asset affect a company’s net income?

A. It has no effect.

B. It would increase the net income.

C. It would decrease the net income.


The correct answer is B.

Increasing the residual value would decrease the annual depreciation expense of the asset. Decreasing the depreciation expense of the asset would thus increase net income.


Reading 29 LOS 29e:

Describe how the choice of depreciation method and assumptions concerning useful life and residual value affect depreciation expense, financial statements, and ratios

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