If your business is a self-employed business (it is not incorporated), you don’t have a Business Number (or has closed the BN account), you have closed your GST number, you don’t have any employee (or have closed payroll account), and the business doesn’t have any activity (no expenses, no assets left, no loan, etc.), then you don’t need to fill in T2125 Statement of Business or Professional Activities for that particular business.
Otherwise, please check our TurboTax FAQ: Tax Obligations After Closing Your Business.
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