No, it sounds reasonable since mileage is not claimed as a tax credit. It is a business deduction.
If you are claiming mileage, then you must be filing Schedule C for self-employment. That means that you are subject to self-employment tax and income tax based on the overall income of your business.
The mileage deduction does not reduce self-employment tax or income tax dollar for dollar. It reduces your business income, which then lowers the self-employment tax and your income tax.
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