You may have an earned income or similar credit that is causing your tax due to decrease. A tax credit reduces your tax and can increase as your income increases when you make under a certain amount of income.
Your earned income credit would be listed on line 27(a) of your form 1040. You may also see other credits on lines 27 to 30. I suggest you look at your form 1040 and those lines in particular to see what changes when you add your additional income.
You can view your form 1040 while working in the online version of TurboTax by following these steps:
While working on your return in the Federal section of TurboTax:
1. Choose the Tax Tools icon on your left menu bar
2. Tools
3. View Tax Summary
4. Choose the Preview my 1040 on your left menu bar
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