Yes. According to page 8 of the IRS instructions for Schedule C under the heading, "line 3", "you can deduct the following taxes and licenses on this line: state and local sales taxes imposed on you as the seller of goods or services. If you collected this tax from the buyer, you must also include the amount collected in gross receipts or sales on line 1". https://www.irs.gov/pub/irs-pdf/i1040sc.pdf
