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Furniture and fixtures, equipment and leasehold improvements are stated at cost. Depreciation of furniture and fixtures and equipment is computed using the straight-line method over estimated useful lives that range from two to ten years. Leasehold improvements are amortized using the straight-line method over the shorter of their estimated useful lives or the term of the related leases.
For example, if you are using the half year depreciation convention over three years, depreciation normally occurs over 3 1/2 years. If you change the last depreciation run date during the 3 1/2 years, the last year of depreciation moves out the number of periods affected. If you move the date by three months, the last year will have nine months worth of depreciation, when normally there would be six months worth of depreciation.