You may need the requested information so that your tax return is accurate so it would be best not to ignore the warning. The sales tax rates are necessary to determine the amount of your sales tax deduction if you itemize your deductions on your federal or state tax return. They are taken in lieu of your state income and property taxes. If you are sure those taxes paid during the year are more than your sales taxes, then you won't need the sales tax deduction. You can use this IRS tool to determine the sales tax deduction in your municipality: IRS sales tax tool
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