An increase in tax due is not the same as an increase in tax. An increase in income of $2,645 might equate to an increase in tax of $317 if you are in a marginal federal tax bracket of 12%.
However, that isn't necessarily true, as you may have credits or deductions and changes to items on your tax return from year to year than can affect your income tax, besides just an increase in income.
The tax withheld from your pay (in box 2 of your W-2 form) will have a dollar for dollar affect on your tax refund. The first thing you should do is compare that number to what it was in the previous year. If it went down $753, that would explain the change in your tax this year.
To be sure, you should compare your return last year to this year and see where there are differences and that would help us better answer your question. You can view your tax return in TurboTax as follows:
1. Find the "Tax Tools" option on your left menu bar and click on it
2. Click on "Tools"
3. Click on "View Tax Summary"
4. On your left menu bar find the "Preview my 1040" option and click on it
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