Is rent (work from home rent) tax exempt or inclusive of HST? For QBO, Ontario resident, sole proprietor. Thanks!

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Every business has its set of specific requirements, thus a professional advice is always recommended to know that you are working as per regulations applies to your business. However, in general, if you are using office space in your place of residence, you can use a portion of rent as you business expense as office rent. How much, is a question of business nature and remt amount.