CRA small business deduction

It is important to make sure you are eligible before you claim the small business deduction. The Canada Revenue Agency (CRA) considers the specific facts of each case in order to determine eligibility, and a reassessment may be completed to disallow the small business deduction if you are not entitled to claim it. 
 
To be eligible to claim the small business deduction, you must be a Canadian-controlled private corporation carrying on a business in Canada throughout the year and meet at least one of the following conditions: 
How to claim the deduction
Corporations have to file a T2 Corporation income tax return within six months of the end of their tax year. If your corporation is located in Quebec or Alberta, you have to file a separate provincial corporation return. For more information on how to claim the small business deduction, go to Chapter 4 of the T2 Corporation – Income Tax Guide.