Mississippi EIN Number and Registration in TAP
Last updated November 1, 2026 · Written by the EIN Registration filing team
Get the EIN for your Mississippi business
We file the SS-4 for you. EIN typically emailed in 2 to 4 business days (about 11 by fax).
After your EIN in Mississippi
| Account | Agency | Number you get | Register |
|---|---|---|---|
| State income tax withholding | Mississippi Department of Revenue | Withholding tax account number, 8 digits | Taxpayer Access Point |
| Unemployment insurance | Mississippi Department of Employment Security | MDES account number | Register |
| Sales tax | Mississippi Department of Revenue | Sales tax permit | Taxpayer Access Point |
Mississippi ties the withholding account to the entity behind the EIN. If your federal identification number changes, if a sole proprietorship or partnership incorporates, or if you buy an existing business, you must register for a new Mississippi withholding account rather than reuse the old one.
A single legal entity gets only one Mississippi sales tax account number, but each separate business location must be registered for its own sales tax permit. Permits are location specific, so moving, even across the street, means notifying the Department of Revenue and updating the registration.
Also on the Mississippi list
- Register with the Mississippi Department of Revenue through the Taxpayer Access Point (TAP) for a sales tax permit, withholding or any other tax account the LLC needs. The department asks for the EIN as identifying information and assigns its own account number to each tax account, and a business that collects sales tax may not open before its permit is issued.
- File the LLC annual report online with the Secretary of State between January 1 and April 15 every year, using the company's Mississippi Business ID.
Agency sites checked November 1, 2026 · All 50 states
What is different about Mississippi
- Mississippi's LLC annual report must be filed online; there is no paper version. Along with the registered agent, principal office and managers or a member, it asks whether the company has a written operating agreement and for a brief description of its business, and an LLC that does not file can be administratively dissolved.
- Mississippi taxes an LLC the way the IRS classifies it. An LLC treated as a partnership files an informational return and skips the franchise tax lines, while one treated as a corporation, including an LLC that elects S corporation status, files as a corporation and owes Mississippi franchise tax, which is being phased down and is repealed effective January 1, 2028.
- Mississippi charges a contractor's tax on the prime contractor for nonresidential construction contracts above a set size, in place of sales tax on the component materials. Before work begins the prime contractor applies for a Material Purchase Certificate for the job on TAP, and subcontractors buy materials under that certificate; residential work stays under ordinary sales tax.
Before you apply
The SS-4 must match the Mississippi Secretary of State filing; its business ID is a state index, not a tax ID.
Mississippi EIN questions
How do I get an EIN number in Mississippi?
File IRS Form SS-4 after the Mississippi Secretary of State approves any formation filing; there is no Mississippi EIN application. Then register with the Mississippi Department of Revenue (Taxpayer Access Point) for withholding and the sales tax permit and the Mississippi Department of Employment Security for unemployment insurance.
Is the Mississippi withholding tax account number the same as my EIN?
No. The Mississippi Department of Revenue assigns it when you register as an employer in Taxpayer Access Point, and it is 8 digits. It goes in W-2 box 15; the EIN goes in box b.
Where do I register for Mississippi unemployment insurance?
With the Mississippi Department of Employment Security. It assigns a MDES account number, a separate number from the EIN.
Do I need a Mississippi sales tax permit?
Only if you sell what Mississippi taxes. The Mississippi Department of Revenue issues it through Taxpayer Access Point, and your returns are filed under its number, not the EIN.
Is there a Mississippi EIN or state tax ID number?
No. The EIN is federal and comes from the IRS. The Mississippi Department of Revenue asks for the EIN when you register on the Taxpayer Access Point (TAP) and assigns its own account number to each tax account, and the Secretary of State identifies the LLC by its Mississippi Business ID. Neither state number replaces the EIN.
Does the tax classification on my SS-4 matter in Mississippi?
Yes. Mississippi taxes an LLC the way the IRS classifies it. An LLC treated as a partnership files an informational return and skips the franchise tax lines, while one treated as a corporation, including an LLC that elects S corporation status, files as a corporation and owes Mississippi franchise tax, which is being phased down and is repealed effective January 1, 2028.
When is the Mississippi LLC annual report due?
Between January 1 and April 15 every year, filed online with the Secretary of State using the Mississippi Business ID; there is no paper version. It asks for the registered agent, the principal office, the managers or a member, whether there is a written operating agreement, and a brief description of the business.
Get Your EIN the Easy Way
Answer a few questions in about 5 minutes. Our specialists prepare your IRS Form SS-4, file it, personally handle any rejection or name conflict along the way, and get your EIN to you, typically within 2 to 4 business days, or about 11 when the IRS requires the application by fax.
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Related guides
Neighboring states
Most-searched states
Sources
- Mississippi Secretary of State, annual reports
- Mississippi Secretary of State, Revised LLC Act (section 79-29-215, annual report)
- Mississippi Department of Revenue, business tax FAQs
- Mississippi Department of Revenue, pass-through entity income and franchise tax instructions
- Mississippi Department of Revenue, guide for construction contractors
- Mississippi Department of Revenue: Register taxes
- Mississippi Department of Employment Security: Register with us
You can also apply for an EIN directly with the IRS at irs.gov at no cost.