Mississippi Department of Revenue – Withholding Tax
Mississippi Department of Employment Security – Unemployment tax
Add to existing company setup
Submit a request to your service team to add MS (withholding) and/or MSSUI (unemployment) 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 601-923-7088.
- 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 601-321-6000.
- Power of Attorney- POA is required, please obtain the prefilled form from your client service representative.
Register a new company
Mississippi Department of Revenue
Employers can register online at https://tap.dor.ms.gov/_/#1. Select Register at the top of the page then select New Taxpayer. Once completed you will receive your account number and deposit frequency.
Mississippi Department of Employment Security
Register online at http://mdes.ms.gov/employers/employer-services-new-user/. Select the New Business Registration link. Once completed you will receive your account number and rate.
Third Party Registration and/or Power of Attorney Instructions
Power of Attorney is required, please obtain the prefilled form from your client service representative.