I have a large rental income loss (expenses far exceed rent collected), am I able to carryforward some of the loss to next year's return?

Rental expenses have to be claimed in the year they were incurred. Rental losses can be claimed against other income like employment income.

But first, you will need to determine if your expenses are current or capital expenses.

Here is more from the CRA:

And this one from TurboTax Tips:

Dos and Don’ts: CCA for Rental Property Explained:  https://turbotax.intuit.ca/tips/dos-and-donts-cca-for-rental-property-explained-6377