Aside from the tax bracket itself, the tax liability can additionally be affected by different things as your income goes up, perhaps other exemptions or deductions phase out, or could include penalties if you are looking at the the amount due to IRS in the tracker on TT desktop, and haven't completed things like estimated taxes etc. No one here can see your return - you need to look at the 1040 line by line to see how the ordinary dividends are changing the tax liability.
