Missouri Payroll Tax Requirements

There are 3 required tax items you need in order to get setup for payroll.

Requirement Format Agency
Withholding Account Number XXXXXXXX (8 digits) Missouri Department of Revenue
Employer Account Number XX-XXXXX-X-XX (10 digits) Missouri Department of Labor and Industrial Relations
Contribution Rate X.X% Missouri Department of Labor and Industrial Relations

Withholding Account Number and Employer Account Number

New businesses can register online. Your Withholding Account Number and Employer Account Number will be generated within 2 weeks.

  • St. Louis Businesses: You are required to register as a new business with the City of St. Louis Collector of Revenue for your St. Louis Earnings Tax and St. Louis Payroll Expense Tax.

  • Kansas City Businesses: You are required to register as a new business with the Kansas City Revenue Division for your Earnings Tax requirements.

Contribution Rate

This information is mailed to you by the Department of Labor and Industrial Relations in November.

  • Your Withholding Account Number is on any document mailed to you by the Department of Revenue.

  • Your Employer Account Number is on previous reports and notices from the Department of Labor and Industrial Relations.

  • If you need assistance with your Employer Account Number or Contribution Rate, contact the Department of Labor and Industrial Relations at (573) 751-1995.

  • If you need assistance with your Withholding Account Number, contact the Department of Revenue at (573) 751-8750.

Link us as your third-party administrator to ensure we are able to complete the quarterly filings and amendments (if applicable) in a timely manner.

Steps to grant TPA for MO Withholding Account

  1. Go to your MyTax Missouri Withholding online account.

  2. From the home page select Profile Information > Manage Authorized Preparers.

  3. Add New Authorized Preparer, enter our information:

    • User ID: [ENTER USER ID]

    • Registration confirmation: [ENTER NUMBER]

  4. Update the start date to your first check date in our payroll system.

  5. Update assignments to Full Access.

  6. Select Save.