The tax act of 2017 decreased the federal supplemental tax rate from 25% to 22% which means less is tax is being collected by my employer for stock grants and I may be underpaying. Since I don't know how much stock I'll receive from my employer in advance, how should I adjust to reduce how much I owe in April 2019? Are others guessing how much stock they'll get and adjusting their W-4?
Federal supplemental tax rate: https://www.patriotsoftware.com/payroll/training/blog/wp-content/uploads/2018/01/income-tax-withhold...
