Mississippi State Tax Guide

State tax registration guide for Mississippi.

Need to register taxes in another state? Review the State Tax Guide section in our Tax Services Toolkit. 

REQUIRED REGISTRATIONS

• Unemployment Insurance: Mississippi Department of Employment Security

• Income Tax Withholding: Mississippi Department of Revenue

REQUIRED INFORMATION

• SIT ID # (format: XXXX-XXXX)

• SIT payment frequency

• SUI ID # (format: XX-XXXXX-X-XXX)

• Current year SUI/ETC rates

Note: Based on your company's details, your Namely Payroll setup may include several Mississippi Tax Codes. Mississippi Employer Training Contribution uses the same ID as Mississippi Unemployment tax.

REGISTERING FOR UNEMPLOYMENT INSURANCE

If this will be your first time running payroll in Mississippi you'll need to register with the Department of Employment Security (MDES). 

Once registered, you will receive an Unemployment Account Number (UI) and Unemployment Rate (%) which you will need to enter into Namely Payroll under Company > Tax screen (UI tax). 

If you've run payroll in Mississippi before, you can find your MDES EAN on notices received from the Mississippi Department of Employment Security such as the Registration Notification Letter and Quarterly Contribution Report (Form UI-2).

For additional information on registering for taxes, read Employment Tax Registration Overview.

REGISTERING FOR INCOME TAX WITHHOLDING  

If this is your first time running payroll in Mississippi you'll need to register with the department through their website. To register, visit the website and Sign Up.

TIP:

Future-date registration is possible for this state's income tax withholding!

Once registered, you will receive a Withholding Tax Account Number (WH) which you will need to enter into Namely Payroll under Company > Tax screen (WH tax).

If you've run payroll in Mississippi in the past, you can find your Withholding Account ID on notices that you have received from the Mississippi Department of Revenue.

CONTACT:

At the same sitefor registration, you will find Contact Us at the bottom of the page which will provide you with resources.

For additional information on registering for taxes, read Employment Tax Registration Overview. 

POWER OF ATTORNEY FORMS

Please note, Namely does not require a Power of Attorney for this state at this time. It is not required to file or remit payments on your behalf. If one is needed to resolve a tax matter, the tax notice team will request one from you at that time.

If a Power of Attorney is requested from you, you should email completed copies of the forms namelyPOA@Namely.com with the CID in the subject line for processing. We will update our system and maintain a copy of each form for record-keeping purposes

For additional information on Power of Attorney, read Completing the Power of Attorney Package.

STATE INCOME WITHHOLDING FORMS

Namely uploads Federal and State W-4 documents to your HRIS site for use during Onboarding, or if you need to send W-4s to employees who need to make withholding adjustments.

TIP:

The most up to date W-4 documents can be found in the Namely section of the Document dropdown menu in Onboarding and Manage eSignature. 

Form Name: 89-350

Accepts Federal W-4: No

Comments: Every employer must obtain from each employee and keep on file Form 89-350, Employee's Withholding Exemption Certificate, to establish the number of personal exemptions claimed. The federal Form W-4 does not supply the appropriate information for Mississippi withholding purposes and therefore is not acceptable.

PAYROLL + TAX FACTS

Refer to this document for more information:2022-2023 Federal and State: Payroll and Tax Fact Sheet.