fiscal period, if the current fiscal period is a stub, otherwise 1 d = the specified CCA rate with respect to the class a = acquisition cost of the property in the current fiscal period b = proceeds of disposition with respect to the property in the current fiscal period (but not greater than its original cost) c = assistance received with respect to the property in the current fiscal period (net of any repayments made) For assets subject to the full-year rule: For assets subject to the half-year rule: Types of allowance Under the Income Tax Act: paragraph 18(1)(b) prohibits the deduction of any outlay, loss or replacement of capital, payment on account of capital or any allowance for depreciation, obsolescence or depletion, unless specifically allowed in Part I of the Act. paragraph 20(1)(a) allows a deduction, in computing the income from a business or property, of any amount allowed by regulation in respect of the capital cost of a property. Part XI of the Income Tax Regulations provides for the calculation rules for CCA, and Schedule II outlines the various classes of capital property that are eligible for it. Special rules are in place to deem certain assets to be in separate classes, thus not becoming part of the general pool for the class. Certain elections are available to taxpayers to transfer or reclassify assets from one class to another. Additional allowances are prescribed with respect to specified circumstances. Specialized calculations for certain classes are also outlined in: Schedule III for property in Class 13 (leasehold interests) Schedule IV for property in Class 15 (property for cutting and removing timber from a timber limit) Schedule V for property relating to industrial mineral mines Schedule VI for property relating to timber limits and cutting rights Part XVII of the Income Tax Regulations provides for specialized calculation rules for CCA with respect to capital property acquired for use in earning income from farming and fishing. Typical classes of assets for CCA purposes CCA is calculated under the half-year rule, except where otherwise specified, with respect to the following classes. In contrast to the practice followed in the United States for depreciation there is no penalty for failing to claim Capital Cost Allowance. Where a taxpayer claims less than the amount of CCA to which he is entitled the pool remains intact, and available for claims in future years. Unclaimed amounts