Your marginal tax rate is calculated based on factors such as your income, your deductions and credits, and amounts you’ve carried forward from previous years. TurboTax automatically updates your marginal tax rate every time you enter a new piece of information.
To see your marginal tax rate:
TurboTax displays the Summary panel on the left side of your screen. Your marginal tax rate (based on the information you've entered so far) is shown in the Quick Graphs section of the Summary panel.