Sales tax is an itemized deduction. You get no benefit from itemizing deductions unless the total is more than the standard deduction for your filing status. Itemized deductions include medical expenses you paid out of pocket in excess of 7.5% of your AGI, the total of property and sales or state income taxes limited to $10,000, mortgage interest, and charitable contributions. If you have a state income tax, you can only deduct state income taxes or sales taxes but not both.
