When you add $100 extra taxable income to your return, your tax liability will go up, but your income-based credits such as the Earned income credit could go down, resulting in a larger increase in tax due.
In short, the increase is not only due to the increase of your tax imputable to the extra income, but also on other factors on your return.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
