There are other things that can affect the net amount of tax in addition to your tax rate. For instance, you may have an earned income or other tax credits that are sensitive to your income. Also, your tax rate on additional income can be different than the tax rate on your original income amount. Furthermore, TurboTax uses tax tables to compute your tax, so you will pay the same tax for income in certain ranges, so all income may not be being taxed at the same exact rate.
You can look on your tax return form 1040 in lines 19 and below to see if you have any credits that are changing in response to your expense entries.
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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