You will include the sales tax that you pay when you purchase the items in the cost of the items.

The sales taxes that you collect are not considered to be income.  They are trust-fund taxes that you collect on behalf of your state.  The only portion that may be reportable as income is the collection allowance that the state gave you (if this applies in your state).  Unless these amounts are included on a 1099 that you received, there is no need to report sales taxes that were collected by you and remitted to your state.