New Company Registration for Mississippi

Disclaimer: This article is not intended to be tax, legal, financial, or HR advice. Rules and regulations change over time and can vary by location. Consult with a lawyer, accountant, Tax, or HR expert for specific guidance.

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Register for Taxes with Middesk

Homebase has partnered with Middesk to make tax registration easier for you.

• Middesk can register you across all 50 states for withholdings/income tax (SIT) and unemployment insurance (SUI)
• Middesk will continue to support your ongoing compliance by processing and surfacing your state mail for your review
• Middesk offers registrations for select PFMLs and local jurisdictions as well

To get started, sign up here and check out this tutorial.

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State Withholding Income Tax

Tax Agency: Mississippi Department of Revenue

Obtaining a Withholding Tax Account Number

1. Go to Mississippi Department of Revenue Taxpayer Access Point  (TAP)
2. Select Register for Taxes
3. Select register a new taxpayer
4. Select entity type, FIEN and complete remaining steps

Creating an Online Account

1. Once you have received your withholding tax account number, set up online access
2. Go back to Taxpayer Access Point  (TAP)
3. Click on “sign up” on top corner
4. Select sign up for online access
5. Complete information

Important to Note

• Update your Homebase account with your Mississippi withholding tax account number.  Your withholding tax account number is required for all MS Department of Revenue interactions to ensure your account is accurate
• If you have any questions regarding this process, contact registration at (601) 923-7700. 

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Unemployment Insurance Tax (UI)

Tax Agency: Mississippi Department of Employment Security (MDES)

Obtaining a Mississippi Department of Employment Security Account Number

1. Go to MDES website
2. Click “register here”
3. Under “For Reporting and Payment of Unemployment Taxes,” click on Register a New Business
4. Complete employer registration

Creating an Online Account

1. Once you have received your account number, go back to Go to MDES website
2. Complete employer signup and create username and password

Turning On Email Correspondence

Note: Employers must register for email correspondence

1. Click on “Employers are required to register for E-mail Correspondence”
2. Follow the steps provided
3. View your correspondence immediately as unemployment insurance correspondence are time-sensitive

Important to Note

• Update your Homebase account with your Mississippi Department of Employment Security Account Number. Your account number is required for all Mississippi tax interactions to ensure your account is accurate.
• If you have any questions regarding this process, please call 601-493-9427 or email tax@mdes.ms.gov.