How to Get an EIN in Mississippi: Free 2026 Guide

Get a Mississippi EIN free from the IRS, then see which DOR TAP and MDES tax accounts your LLC needs for withholding, sales tax, and payroll.

Getting an EIN in Mississippi is free, and faster than most owners expect as of 2026. The Internal Revenue Service issues the nine-digit federal number at no cost, and an online application is usually approved on the spot. The local work starts after the EIN, when you form your Mississippi LLC and register with the Mississippi Department of Revenue and MDES.

Do You Need an EIN for Your Mississippi LLC?

A Mississippi LLC’s EIN requirement comes down to its federal tax classification and whether it pays employees. The table sorts out the common setups for a Mississippi LLC before you apply.

A single-member LLC with no employees isn’t federally required to have an EIN, since the IRS treats it as a disregarded entity. Most owners apply anyway, because banks ask for one and it keeps a personal Social Security number off W-9s and vendor records.

Multi-member LLCs default to partnership taxation, which is where a Mississippi operating agreement earns its place. It’s worth knowing what forming a Mississippi LLC costs first, since the $50 Certificate of Formation comes before the EIN in the sequence.

Applying for Your Mississippi EIN: Online, Fax, or Mail

Most Mississippi owners finish the online application in one sitting. The screens stay simple until the entity-classification question, which is where refilings tend to start.

1. Confirm your LLC is approved: the legal name on the EIN has to match the approved name on file, so don’t apply before the Secretary of State clears it.
2. Open the IRS EIN Assistant: it runs Monday through Friday from 6 a.m. to 1 a.m. Eastern the next day, with shorter windows on Saturday and Sunday.
3. Pick the right entity type: choose the classification that matches your federal election; this is the screen that sends people back to refile.
4. Enter the legal name and any trade name: the legal name matches the Certificate of Formation, and a DBA goes in the trade-name field.
5. Name the responsible party: a natural person with an SSN or ITIN, never a nominee or another company.
6. Submit and save the confirmation: download the CP 575 confirmation letter the moment it appears, because the IRS won’t resend it.

Mississippi EIN Approval (EIN Confirmation Letter): Save Your CP 575 Before You Use Any State Numbers

Once the IRS approves the application, the letter to save is the CP 575. This is the official EIN confirmation letter for your Mississippi LLC, and it proves the federal number was issued to the exact legal entity name you entered.

In Mississippi, this matters because the federal EIN is only the starting point. After that, the state may assign separate numbers through the Department of Revenue and MDES, so keeping the CP 575 makes it easier to tell your federal EIN apart from the other accounts that come later.

What it looks like

• A one-page IRS notice showing the business name, mailing address, and newly assigned federal EIN.
• The letter heading references the IRS and serves as the first formal proof that the EIN belongs to your Mississippi LLC.
• It is different from Mississippi state tax accounts, including the DOR’s eight-digit account number and the MDES employer number.
• You may need it when opening a bank account, verifying the EIN, or organizing your Mississippi TAP and MDES registrations.

Sample CP 575 confirmation letter

Important: download and save the CP 575 immediately, because the IRS does not reissue it once the session is closed. If it gets lost later, you would usually need to request an IRS 147C letter instead. For Mississippi owners, that extra step is worth avoiding before registering in TAP or setting up MDES accounts.

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Bottom line: nobody has to pay for this. The EIN is free straight from the IRS EIN application, so a third-party site charging $150 to $300 is billing you for a free government service. If you can’t apply online, fax Form SS-4 (about 4 business days with a return fax number) or mail it (roughly 4 weeks).

Applicants whose principal place of business sits outside the U.S. can apply by phone at 267-941-1099. That number isn’t a general no-SSN line, and a domestic responsible party without an SSN or ITIN enters “foreign” or “N/A” on line 7b of Form SS-4. The IRS also issues only one EIN per responsible party per day.

What You Need to Apply for a Mississippi EIN

A few things in hand before you open the form keep the application short and the confirmation letter accurate. Form the LLC first, so the legal name lines up with the CP 575.

• Approved legal name: exactly as it reads on the Secretary of State record; run a quick Mississippi LLC name search if you’re unsure.
• Formation details: the filing date and entity information from your Certificate of Formation.
• Responsible party: a natural person’s name with their SSN or ITIN.
• Entity type and reason: your federal classification and why you’re applying, such as starting a business or hiring staff.
• Business address and phone: the LLC’s principal location.

Timing matters here. If the filing is still pending, it’s worth checking how long Mississippi LLC approval takes before you queue up the EIN.

EIN vs Your Mississippi DOR and MDES Tax ID Numbers

A Mississippi LLC can end up holding three different tax numbers, and they aren’t interchangeable. The table shows who issues each and what it does.

Here’s the thing: the federal EIN identifies your entity when you register with the state, but it never becomes your Mississippi account number. The DOR assigns its own eight-digit number for each tax account, and MDES assigns a separate ten-digit number once you’re an employer.

Registering for Mississippi State Taxes Through TAP and MDES

The EIN is what unlocks these state registrations, and Mississippi spreads them across two agencies. You’ll register most tax accounts with the Department of Revenue through its Taxpayer Access Point (TAP), and unemployment tax separately with MDES.

Withholding Tax Account (DOR)

Every employer paying wages to a Mississippi resident, or to a nonresident for work performed in the state, registers for a withholding tax account through TAP. The DOR issues an eight-digit account number, and registration usually takes up to 10 business days. Your federal EIN (FEIN) identifies the business at sign-up, but it doesn’t double as the withholding number.

Sales and Use Tax Permit (DOR)

An LLC selling tangible goods or taxable services needs a sales tax permit before it starts operating. There’s no fee for the permit, though a bond can be required depending on the business.

The general rate is 7%, and groceries are taxed at 5%. The permit is location-specific: one entity holds a single account number, but each location registers for its own permit, and a permit can’t be transferred to a new owner. Allow about two weeks for the packet after approval.

Seller’s Use Tax for Out-of-State Sellers (DOR)

The catch for a lot of online sellers: an EIN alone doesn’t cover Mississippi. Out-of-state businesses with more than $250,000 in sales into Mississippi over any twelve-month period cross the economic-nexus line and have to register to collect seller’s use tax.

Unemployment Insurance Account (MDES)

Once an LLC has employees, it registers with the Mississippi Department of Employment Security using the UI-1 Status Report. Commercial liability generally begins after $1,500 in wages in a calendar quarter, or one worker in 20 different weeks of the year.

The MDES employer account number has ten digits, the taxable wage base is the first $14,000 of wages per employee each year, and new-employer rates start at 1.0%.

Corporate Income and Franchise Tax

LLCs electing corporate treatment register through TAP for corporate income tax, and franchise tax still applies for tax year 2026 at $0.50 per $1,000 of capital above $100,000. Mississippi is phasing this out: the rate drops to $0.25 per $1,000 in 2027, and the franchise tax is repealed effective January 1, 2028.

To register any of these, sign in to TAP, choose Register Now, and keep your EIN handy, since it’s required to open each account. After the EIN, a Mississippi LLC also files its annual report and keeps a current registered agent on record to stay in good standing.

Common Mississippi EIN and TAP Registration Mistakes

Most Mississippi EIN problems aren’t about the IRS form at all. They surface at the state layer, where the DOR and MDES accounts pile up.

• Using the FEIN as the Mississippi withholding number: the DOR issues a separate eight-digit account, and the federal number won’t post on TAP withholding returns.
• Finishing on TAP and forgetting MDES: withholding and sales tax run through the Department of Revenue, but unemployment is a separate MDES registration with its own ten-digit number.
• Running every Mississippi location on one permit: each location needs its own sales tax permit under the single account number, and that permit can’t transfer to a buyer.
• Ignoring the $250,000 seller’s use tax line: out-of-state sales into Mississippi above that figure over twelve months trigger registration, EIN or not.
• Counting the franchise tax as already gone: it still applies in 2026 at $0.50 per $1,000 of capital over $100,000 and isn’t repealed until January 1, 2028.

If You Lose Your EIN or Change Your Mississippi LLC

An EIN doesn’t expire, and it’s easier to recover than people fear. If the CP 575 is long gone, there are a few reliable ways to retrieve your EIN before asking the IRS for a 147C verification letter.

Look first on a prior federal return, an old IRS notice, or your business bank records, since the number sits on all three. A 147C letter replaces the CP 575 when nothing else turns it up, and the IRS reads the number back to an authorized person over the phone.

Some changes need a brand-new EIN, and many don’t. Converting a sole proprietorship to an LLC, or going from single-member to multi-member, generally requires a new one; a plain name or address change is just a Form 8822-B update. On the state side, a changed federal EIN means a new DOR withholding account, so update TAP whenever that number changes.

Mississippi EIN Frequently Asked Questions

These are the questions Mississippi LLC owners ask most once the EIN lands and the state registrations begin. Several are specific to how the Department of Revenue and MDES handle accounts.