A tax credit is a dollar-for-dollar reduction of the income tax you owe. For example, if you owe $1,000 in federal taxes but are eligible for a $1,000 tax credit, your net liability drops to zero. Essentially, a tax credit offsets the amount of taxes you owe. Unlike tax deductions and exemptions, which reduce the amount of your taxable income, tax credits reduce the amount of taxes you owe.