What item is NOT used to calculate the federal income tax to be withheld by employers?

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The W-2 is not used to calculate the federal income tax to be withheld by employers. It is the document that reports an employee's total earnings and taxes withheld for the year after the fact, not before. The calculations are based on the employee's total earnings, as reported on the W-4 form and according to the guidelines outlined in Publication 15 (Circular E).

What Item Is NOT Used to Calculate the Federal Income