How do I fill out form T2125 for day trading US securities?

Hi, 

you will enter all your Proceeds of dispositions (box 21 on T5008) as your income and  your Book value (box 20 on T5008) as cost of purchases. If you have other expenses  you will need to add it to appropriate lines on T2125 form.

Hi, the only available input box for business income is "Self employment Income reported on T4 slips (Box 81, 82, or 83)" . Do you mean that we have to enter box 21 on T5008  as "Self employment Income reported on T4 slips (Box 81, 82, or 83)" ? Because it's not reported on a T4 slip, it is on a T5008 slip.