Final answer:
The information about federal income tax deductions related to the employee's number of exemptions is found on Form W-4, which is used by employees to convey their tax situation to their employers for withholding purposes.
Step-by-step explanation:
Federal income tax deductions related to the employee's number of exemptions can be found on Form W-4. This form is used by employees to indicate their tax situation to their employer, including the number of allowances they are claiming, which directly impacts the amount of federal income tax withheld from their salary. Form W-4 is, therefore, instrumental in determining the amount of money that is taken out of an employee's paycheck for tax purposes.
Other forms related to taxes include Form W-2, which reports an employee's annual wages and the amount of taxes withheld from their paycheck, and Form 1040, the U.S. individual income tax return form, which is used to file personal income tax to the IRS. Form 941 is used by employers to report payroll taxes to the IRS.