A change, for depreciation purposes, of either estimated useful life or from one GAAP to another GAAP accounting method, usually is referred to as a change in accounting principle.

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A change in estimated useful life or depreciation method is considered a change in accounting estimate, not a change in accounting principle. Changes in accounting principles refer to switching from one generally accepted accounting principle (GAAP) to another.

A Change, for Depreciation Purposes, of Either Estimated Useful Life