A deduction such as mileage is not a dollar for dollar increase in your refund or reduction of tax due.
It is a reduction of taxable income.
For instance, if you are in the 30% tax bracket, a 9700 deduction may bring your balance due down around $3,000-give or take.
In addition, as your taxable income lowers, certain credits, such as the child tax credit could be reduced or eliminated which could reduce your tax result.
The more information you enter, the more accurate the refund meter will be, and will not be totally accurate (and thus truly meaningful) until you have entered all of your information including all income and expense/deductions.
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