Depreciation is the process of allocating the cost of a tangible asset over its useful life rather than deducting the full cost in the year it was acquired. A sinking fund is a fund created by regular member contributions to pay for future repairs or reconstruction of a building. Key aspects of a sinking fund include mandatory member contributions of at least 0.25% of construction costs annually, long-term investment of the funds, and use of the money for major repairs approved by members. Societies must properly track and manage sinking funds according to regulations.