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Yes, you can deduct any reasonable expenses you incur to earn rental income. This means that you can deduct current expenses from your gross rental income in the year you incur them.
As per CRA, current or operating expenses are recurring expenses that provide a short-term benefit. For example, the cost of repairs you make to keep an asset in the same condition as it was when you acquired it. You can deduct current expenses from your gross income in the year you incur them. Capital expenses provide a benefit that usually lasts for several years. For example, costs to buy or improve your property are capital expenses. Generally, you cannot deduct the full amount of these expenses in the year you incur them. Instead, you can deduct their cost over a period of several years as capital cost allowance (CCA).
You can visit the article on Rental Property Expenses: Current or Capital? to learn more about expenses related to your rental property.