The app calculates the net pay without the user having to enter any data into text fields (no app existed in the App Store without text fields for financial numbers). The removal of text field enabled the app to display information never seen before.
The app also allows the user to elect multiple pre tax deductions (401 K, HSA, FSA). The limits are set automatically!
Rich graphical interface shows the user the effect of changing one variable on federal and state withholding tax at the same time!
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