Idaho State Tax Commission

Idaho State Tax Commission

Income tax withholding tables, guide updated

Employers: We’ve updated A Guide to Idaho Income Tax Withholding on our website to reflect new tax laws.  The laws have significantly changed the withholding tables for 2018.  You don't need to adjust withholding back to the beginning of the year, but you must use the revised tables going forward. 

Idaho now uses an Idaho allowance count on the federal W-4 line 5 to calculate withholding.  The Idaho withholding allowances are based on the number of children who qualify for the Idaho Child Tax Credit.  See pages 19-22 of the Guide for details.  We recommend all employees update their W-4s.  You can find information about adjusting W-4s through our Tax Reform webpage. 



Posted 05-01-2018
tax pros general

This information is for general guidance only. Tax laws are complex and change regularly. We can't cover every circumstance in our guides. This guidance may not apply to your situation. Please contact us with any questions. We work to provide current and accurate information. But some information could have technical inaccuracies or typographical errors. If there's a conflict between current tax law and this information, current tax law will govern.