W-4 information determines paycheck tax withholding amounts. Over-withholding leads to refunds; under-withholding may require additional tax payments.
Form W-4 (Employee's Withholding Certificate) is an IRS document that determines federal income tax withholding from employee paychecks.
Update Form W-4 after major life changes like marriage, having children, or starting a second job. Annual review is recommended.
Provide personal information, filing status, and any adjustments for dependents or additional withholding. Include multiple jobs or a spouse's income if applicable.
Employers must withhold at the highest rate for single filers with no adjustments, potentially leading to overwithholding.
Employees can claim exempt only if they had no tax liability last year and expect none this year. Most employees don't qualify.