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Given just the information you have provided your Federal tax obligation will be $19,098. This is determined by taking the $100,000 income and subtracting the standard deduction of $5,700 and the exemption for yourself of $3,650 leaving a taxable income of $90,650. The tax chart for a single person shows a tax on this of $19,098. If there are other income factors, student loan deductions or any of a host of other items not mentioned they will change the results.