According to www.canada.ca website I can claim some home office expenses such as rent, electricity, heat, water and home Internet. Where can I find an option for rent?

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Also, it's not clear where to add them: GST, HST or Exempt?

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Are you using TurboTax CD/Download or TurboTax Online?

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TurboTax Online

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Please see our TurboTax video, included below, for directions. You will enter the percentage of rent used in Other.

Claiming business use-of-home expenses

When entering your expenses, you will enter them under GST if you paid GST or HST if you paid both taxes on the expense.

Thank you for choosing TurboTax.