A web user asks, I couple of related questions:

1- Is there a formula that is used to calculate federal tax that is going to be whithheld from every paycheck? I understand it is based on W-4 form enteries, frequency of the paycheck (weekly, biweekly etc) and the tax bracket related to the taxable income but can someone please tell me what that formula is in terms of math denotation/expression? e.g. tax to be withheld = a x b/xy where a, b, x, y are various variables and what those variables are.

2- When Fed tax is withheld, is it withheld against the gross income for that period or the gross income minus FICA (ss and medicare tax) and/or medical health insurance premium? I understand that in case of 401k contributions, gross income minus 401k contribution = taxable income, which is then used to calculate FICA and so on. Similiarly, is state tax withheld against the gross income or gross income minus fica minus fed tax?

Thanks in advance.

Can you help them out? Post your advice!

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