Missouri
Last Updated June 17, 2026
Missouri employers must register for withholding tax and unemployment insurance accounts and comply with state payroll reporting requirements. Use these resources to access employer guidance and tax information.
State Tax Guidelines
Missouri Department of Revenue – Withholding Tax
Agency Information
Add to existing company setup
Submit a request to your service team to add MO (withholding) to your company setup. Please include the below with your request:
- Withholding – Withholding account number and Deposit Frequency. If you’re unsure of your deposit frequency or account number you can call the agency at 573-751-3505.
- Power of Attorney- POA is required, please obtain the prefilled form from your client service representative.
Register a new company
Employers can register for both withholding and unemployment online at https://dor.mo.gov/registerbusiness/ . Select Continue at the bottom of the page. Follow the prompts to register your business. Once completed you will receive your account number and deposit frequency within 1 -2 weeks.
Power of Attorney
Missouri Department of Labor and Industrial Relations, Division of Employment Security – Unemployment tax
Agency Information
Add to existing company setup
Submit a request to your service team to add MOSUI (unemployment) to your company setup. Please include the below with your request:
- Unemployment – Account Number and Tax rate. This can be found on a Tax Rate Notice or the Quarterly contribution report. If you’re unsure of your tax rate or account number, you can call the agency at 573-751-3215. Effective 4th quarter 2016, the account number format was changed from 14 digits to 10 digits. Please contact the state directly to obtain your new account number.
- Power of Attorney – POA is required, please obtain the prefilled form from your client service representative.
Register a new company
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