The IRS has created a new Tax Withholding Estimator, based on the significant changes under the Tax Cuts and Jobs Act. The new Tax Withholding Estimator offers workers, as well as retirees, self-employed individuals and other taxpayers, a simpler tool to determine the correct amount of income tax they should have withheld from wages and pension payments.
The Estimator allows for wages from multiple jobs, spousal wages, and other sources of income, to determine the most accurate withholding amount.
The Tax Withholding Estimator can be found at https://www.irs.gov/individuals/tax-withholding-estimator.