There could be so many reasons.
Besides your income and the tax on that income, are you loosing any credits, such as Child Tax Credits?
Was the increase all earned income or did you have Capital Gains or take any early distributions?
You can look over your 1040 and compare it to last years to see where the numbers are different.
Look at line 15 (income) and 16 (tax)
Look at line 24 total tax and then look for the adjustments that were made after. Did you loose any credits?
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