Yes, you can split T5 investment income if it's from a joint account. If you are preparing a joint return, you would enter the slip on one spouse/partner's return and then enter their percentage of the investment. The rest will automatically go to the other spouse/partner.
You would report the split according to the attribution rules, in proportion to who invested their money. Ex: Mary reports the full amount of the T5 and Mary puts 25% in the box "Enter percentage of slip to claim on your spouse's tax return (if applicable)" because she only contributed 25% to the investment. John does not need to enter a T5 on his return. 75% of the amount of Mary's T5 will automatically transfer to his Schedule 4.
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