If I'm understanding your question correctly - The sales tax is not something you would include, since it is not part of your revenue. You sold a product for X dollars, but you got paid X plus sales tax. The sales tax is paid to the state, not you. When you enter your income, you only enter what you got paid, NOT including the sales tax.
For example, I sell a product for $1164.15, but my state sales tax is 0.07375%, so I collect from the buyer a total of $1250. When I report my income, I only report the 1164.15 because the sales tax (85.85) got paid to the state.
