Maybe based on the W-4 you gave your employer, not enough was withheld to cover 90% of 2024 taxes or 100% of 2023 taxes. 100% becomes 110% if your 2023 adjusted gross income was $150,000 or more. Review the 2210
some ways underwithholding can occur. irregular paychecks. income not subject to withholding and not properly accounted for when preparing the W-4.
