After you file

Your tax computation may be more complicated than simply taking your taxable income and applying a tax rate to it. For instance, your taxable income may include capital gains that are taxed at capital gain tax rates, which may differ from normal tax rates.  You may be subject an alternative minimum tax. It is also possible you have other taxes besides income taxes included in your tax.

When you print out your return and associated forms and schedules, you will see a Tax Smart Worksheet that you can review that will tell you what table or worksheet was used to calculate your tax. There are various potential nuances that come in to play to calculate your tax, based primarily on the sources and amount of your income. You would have to review those worksheets to get a firm understanding of how your tax was calculated.