In Notice 2019-25, the IRS has expanded the estimated tax penalty that it previously announced in Notice 2019-11. The waiver now applies to taxpayers whose total withholding and estimated tax payments are 80% or more of their 2018 taxes-down from 85%. The notice also updates procedures for requesting the waiver and provides procedures for taxpayers who have already paid underpayment penalties but who now qualify for relief to request a refund.