How do I enter a vehicle lease on my tax return? I own the vehicle and I lease it to a business.

Any costs you incur to lease a motor vehicle can be deducted. Include these amounts on line 9281

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Furthermore to HeerG's answer -  You would need to determine whether your lease income is a rental income or a business income. There are some different treatments between those two. Please visit our Self-employment and Rental Income Centre for more information and have a look at the following article from TurboTax - What Motor Vehicle Expenses Can Self-Employed Claim?