How Do I Enable Gross-Up Processing for an Earnings Element
You can perform net-to-gross processing of earnings elements. The payroll process calculates the gross amount required to meet the net pay. You select which taxes and other deductions you're willing to pay by selecting the balances used during net-to-gross processing.
When defining earnings of Standard or Supplemental types, the template provides a question that enables net-to-gross processing.
Federal, state, and local levels of taxes are available for inclusion or exclusion.
For further info, see How the Payroll Process Calculates Net-to-Gross Earnings for the US in the Help Center.