To do this in TurboTax Online, you would enter the T5 slip for one spouse, then at the bottom of the T5, enter a percentage in the box labeled “Enter percentage of slip to claim on your spouse's tax return (if applicable)”. Then click the “Done with T5” button to go to the “T5 – Summary”. When you are finished entering all your T5 slips, click on “Done with T5s”, and continue on until the “Here's your income summary”. You will see the T5 split on that page, not the “T5 – Summary” page.
