How much tax in dollars on a taxable incomeof 8400.00?

To calculate the tax on a taxable income of $8,400, you would need to know the applicable tax rate or tax brackets for the relevant tax year. For instance, in the U.S. for 2023, the federal tax rate for individuals in the lowest bracket is 10% for income up to $11,000. Therefore, if the entire $8,400 falls into that bracket, the tax would be $840. However, this does not account for any deductions or credits that may apply.