Yes, you can adjust your withholding during the year if your tax situation changes. If you experience significant changes in your personal or financial circumstances, such as getting married, having a child, or starting a new job, you may need to update your Form W-4 to ensure accurate federal income tax withholding. You can submit a new Form W-4 to your employer at any time to make adjustments. It is important to review your tax situation periodically and update your Form W-4 as needed to avoid under- or over-withholding. By adjusting your withholding, you can ensure that the correct amount of federal income tax is withheld from your wages, helping you avoid unexpected tax liabilities or excessive refunds.