The tax preference results from the application of the dividend tax credit. This credit, along with a “gross-up mechanism”, provides you with a credit for the estimated corporate income tax already paid on the income that provides the dividend.
For these purposes, there are two different sets of dividend tax credits and gross-up amounts, depending on the type of dividend.
An “eligible dividend” is generally a dividend paid out of a corporation’s income that is subject to regular corporate tax rates (typically 25% − 30%, varying by province).
A non-eligible dividend is generally a dividend paid out of a corporation’s income that was eligible for the small business deduction on the first $500,000 of active business income of a CCPC, and thus subject to lower corporate tax rate (the small business rate is around 13% − 15%, varying by province).
You do not have to make the determination as to the type of dividend. The corporation paying you the dividend must indicate whether it is “eligible” or not.
For an eligible dividend, the dividend is grossed-up by 38% − in other words, for every $100 of dividend you receive, you report income of $138 on your tax return. The federal dividend tax credit is the 6/11ths of the gross-up amount. The amount of the provincial credit depends on the province, but in rough terms, you get a credit for something close to the gross-up.
A non-eligible dividend is grossed-up by 17%. The federal dividend tax credit is 21/29 of the gross-up amount. Again, the amount of the provincial credit depends on the province.
As noted, the purpose of the credit and gross-up mechanism is to provide the individual shareholder with a credit for the corporate tax already paid (or presumed to have been paid), thereby avoiding double taxation. The net result should amount to the “integration” (more or less) between the personal and corporate tax. This means that the total amount tax paid by the individual and the corporation should generally equal the amount of tax that would have been paid, had the underlying business income been earned directly by the individual.