In most cases it isn't a big deal, but according the the Schedule C Instructions for line 23 (taxes):

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.

Do not deduct the following.

State and local sales taxes imposed on the buyer that you were required to collect and pay over to state or local governments. These taxes are not included in gross receipts or sales nor are they a deductible expense. However, if the state or local government allowed you to retain any part of the sales tax you collected, you must include that amount as income on line 6.

I'm not sure about other states, but my state imposes it on the buyer, then the seller collects it and pays it over to the state.  That means they would NOT put it on Line 1 or deduct it as an expense.

https://www.irs.gov/instructions/i1040sc#en_US_2023_publink24329wd0e1722