Kansas requires businesses with employees to register for a withholding tax account.
Kansas prefers employers register online, there is no registration fee.
Follow this link to the Kansas Department of Revenue's "Customer Service Center" and follow the instructions to set up the withholding tax account: https://www.kdor.ks.gov/Apps/kcsc/login.aspx
After registering online it will take 48 hours for the application to process and generate an account number. The account number will be sent to you in the mail.