The T5008 shows you the cost base of the transactions through the broker. You are responsible for calculating and reporting the adjusted cost base using the information in Box 20 and the reporting the ACB in column 3 of schedule 3.

The amount in box 21 is the proceeds of the sale and is reported in column 2.

Your broker can probably give you a summary of investment counsel fees paid, but the capital gains and losses cannot be delivered by any brokerage firm. Here is why:

An investment dealer can only tell you what you paid for a security bought through their firm or received though a sale through their firm. Since the cost base an capital gains are determined at the security level (i.e. common shares of ABC) and that the same security can be held in multiple forms and at multiple brokerage, it is impossible for them to tell you what your gains and losses truly are.

Say you have 100 shares of ABC Co that you bought 5 years ago through Big Broker Co. for $10 per share. They you open a managed account at Niche Broker Co. and the money manager buys 250 shares of ABC Co at $12.50 per share. Three month later the Niche Broker Co. money manager sells out of ABC Co at $14.00 per share.

If Niche Broker Co. send you a slip saying you had a capital gain of $375 and you add $187.50 to your income, both you and the broker may end up owing penalties to the CRA because you didn’t report enough of the capital gain. This is because the 100 shares bought elsewhere are included in your ACB (the actual gain would have been $553.57).