Last year my capital gains were under $200. Not much has changed in my investments since then, but this year over $6,000 is entered in the capital gains line of my return, adding $6,000 to my income which seems ridiculous. Am I entering information incorrectly?
You need to go in and "Edit" the T5008 slip itself. When you import these slips from CRA, they are usually missing "Box 20", which is the "Adjusted Cost Base" (purchase price) of your shares. Without entering this number, you will have Capital Gains on the entire "Proceeds of Disposition", which is no doubt why you are seeing this large addition to your income.