Step 1: See if you are eligible to itemize deductions
Determine your eligibility to itemize deductions on Schedule A. The deduction for your sales tax payments is only available if you are eligible to itemize. To make this determination, add up all of your expenses that are eligible to be itemized, including your sales taxes. If the total amount is greater than the standard deduction amount for your filing status, then you can itemize on Schedule A and claim the sales tax deduction. If not, then you can still itemize but are probably better off claiming the standard deduction where you cannot deduct the sales tax.