Complete Form W-4 so your employer can withhold the correct federal income tax from your pay. Consider completing a new Form W-4 each year and when your personal or financial situation changes. This change may also be done electronically in the Employee Self Serve System.
How do I know how much to claim for dependent deductions or other deductions on my W-4?
Publication 505, Tax Withholding and Estimated Tax is available on the IRS web site: https://www.irs.gov/. This publication is typically updated in March (for the current year) and provides information which may be useful to employees regarding Tax Withholding, Estimated Tax, Credit for Withholding and Estimated Tax, Underpayment Penalty and How To Get Tax Help.