While filing my taxes next year as a sole proprietor, I am considering claiming my Home Use of Business Office Expense (portion of my rent).

My challenge is that my roommate is on the apartment lease (I found this rental via kijiji a while back) & I just pay him via cheque. There’s no receipt or any written agreement between us.

In this scenario, I am wondering:
– If I should claim my Home Use of Business Office Expense.
– If I do and get audited by CRA, how would I go about handling the audit.

Appreciate the insights, thank you.