This calculator is designed to help you see the financial impact of adding, or removing, a spouse’s income to your household. As with any decision of this type, there are many factors to consider, but knowing your finances is a good place to start. Withholding schedules, rules and rates are from “IRS Publication 15” and “IRS Publication 15T”. This calculator uses the redesigned W-4 created to comply with the elimination of exemptions in the Tax Cuts and Jobs Act (TCJA).