Tax Reform Tax Tip 2018-115, July 26, 2018 IRS.gov is a great place for taxpayers to visit when they have questions about the Tax Cuts and Jobs Act. The legislation, which was passed late last year, includes changes to many areas of the tax law. Here are some of the resources on IRS.gov that will help individual taxpayers, businesses and the tax community understand the law and its effect on their taxes: Tax Reform Web Page. The Tax Reform page highlights what taxpayers need to know about the tax law changes and how these changes affect them. This page also links taxpayers and tax professionals to news releases, tax tips, publications, notices, and legal guidance related to the legislation. Updated Withholding Calculator. The IRS encourages everyone to use the Withholding Calculator to perform a “Paycheck Checkup,” which is even more important this year because of the tax law changes. The calculator helps taxpayers determine if they’re having the right amount of tax withheld from their paychecks. Updated Form W-4, Employee’s Withholding Allowance CertificatePDF. Taxpayers who determine they need to make changes to their withholding can complete a Form W-4, which reflects the tax law changes. Employees will submit the completed Form W-4 to their employers. Frequently Asked Questions. The IRS posted new FAQs to help people understand how to use the Withholding Calculator and the changes to the Withholding Tables. More information about the tax law changes will be coming throughout the year. IRS.gov will be updated to reflect changes as they develop.