For home office expenses there are three fields: GST, HST and exempt.

[Acer1]

I'm in Nova Scotia, would i place Electricity/Water and Internet in the GST AND HST Column or just one of the columns?

[TurboTaxSusan]

You would put it in either the GST or the HST column depending on what tax you paid.

HST has GST built in, so if you paid HST on an expense, then you would enter it in the HST Taxable column.