You would enter the full amount of your expense (sales tax included) into the column that corresponds with the sales tax you paid for that expense. Ex: If you bought Supplies and you were charged HST on those supplies, then you would put the full total (price + HST) in the HST column.
If you enter an amount under "Expenses which you incurred for the entire home", then TurboTax will automatically calculate the amount of the expense that you can claim, based on the area of the space used for business and how much you work in there. The "expenses which you incurred for office space only" section is for things you pay for that are just for your work area, ex: ink & paper for a printer you only use for work.
If the amounts for your expenses are not calculating property, then double check that you have entered the information about your workspace size and hours worked correctly. If you are still not able to resolve this issue, please contact our phone support team at 1-888-829-8608.
