Does gross income include taxes that I collected from my customer?

[sceptre2017]

Yes, you will include the taxes you collect from your customers as part of your gross income, and the expense the taxes in the business expense section.  See the link below from another user who discusses this in better detail, along with other filing information which may not be covered by Turbo Tax

https://ttlc.intuit.com/questions/2720767-does-the-business-income-include-sales-tax