How does an employee indicate additional withholding on their W4 form?

An employee indicates additional withholding on their W-4 form by filling out the additional withholding section. This section is specifically designed for employees to request that extra amounts be withheld from their paychecks beyond the standard withholding calculated based on their filing status and allowances. By providing this information directly on the W-4, the employee ensures that the payroll department has the necessary details to adjust their withholding accordingly.

This process is important because it allows employees to manage their tax liability proactively, ensuring they do not owe a large amount when filing their tax returns. Instead of relying on informal methods, such as verbal notification or other means, utilizing the official W-4 form ensures a clear and documented request for any additional withholding.