The City of Oakland has developed this tool to help business owners estimate their City of Oakland Business License Tax. Need to withhold more money from your paycheck for taxes, decrease the number of allowances you claim, or have additional money taken out.This video is all about the California DE 4 Form and I will show you how to fill it out in 2021. How to manage employee tax withholdings. Withholding tax accurately is the legal responsibility of the issuing company. Learn about income tax withholding and estimated tax payments.