Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Capital Cost Allowance is effectively the means by which Canadian businesses may claim depreciation expense. Depreciable items are deemed to belong to different classes which depreciate at different rates and are subject to different rules. For the most common classes the value of all assets belonging to that class are accumulated in a pool, and the designated percentage for that class may be claimed on the balance in that class at the end of the taxation year.