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Premises and equipment
12 Months Ended
Dec. 31, 2011
Premises and equipment  
Premises and equipment

end of 2011 2010
Premises and equipment (CHF million)  
Buildings and improvements  4,060 3,944
Land  872 882
Leasehold improvements  2,241 1,958
Software  4,614 3,801
Equipment  3,188 3,092
Premises and equipment  14,975 13,677
Accumulated depreciation  (7,782) (6,952)
Total premises and equipment, net  7,193 6,725



Depreciation and impairment

in 2011 2010 2009
CHF million  
Depreciation  1,078 1,115 1,019
Impairment  87 16 45



In 2011, the estimated useful lives for leasehold and building improvements in Switzerland were increased from five to ten years, based on a change in estimate. The cumulative effect of adopting this change in estimate on January 1, 2011 was a decrease in depreciation expense of CHF 64 million (CHF 56 million after tax).