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Form W-4 is crucial for both employees and employers as it provides the necessary information for determining how much federal income tax should be withheld from an employee's paycheck. When an employee fills out a W-4, they indicate their filing status, number of dependents, and any additional amount they wish to have withheld. This information allows employers to accurately calculate the appropriate amount of federal taxes to withhold based on the employee's specific tax situation, ensuring that the employee's withholding aligns with their expected tax liability for the year.

The other options do not pertain to the primary function of Form W-4. For example, it does not relate to how overtime pay is computed or an employee's hourly wage. Additionally, while final paycheck calculations involve various deductions and considerations, the W-4 specifically addresses federal income tax withholding. Therefore, the primary role of Form W-4 is to guide employers in the correct assessment of federal income tax withholdings.