Do I have to split the interest paid amount with my spouse or can I put it all on one? The investment interest has both our names on the documentation.

Hey @chantalmlarocque 

If you're filing together as a couple, you can claim the amount at 100%. If you're filing separately, you can opt to split the investment interest 50/50, therefore you'd claim only 50% of the interest income on each of your returns. 

hope this helps!