To avoid paying an underpayment penalty, you are required to either pay at least the amount of taxes paid on the prior year's return or 90% of the tax on your current year return. If your employer is not withholding enough taxes from your paycheck, you can complete a W-4 and submit it to your employer to have additional taxes withheld for 2025 or you may have the same issue next year when filing taxes. The other option is make quarterly estimated tax payments.
