How to Get an EIN in New Mexico
How to Get an EIN in New Mexico
An Employer Identification Number (EIN) is your business's federal tax identification number, issued by the Internal Revenue Service. If you're starting a business in New Mexico, you'll need an EIN to file taxes, hire employees, open a business bank account, and establish business credit. The process is free, straightforward, and can be completed online in minutes.
This guide walks you through getting your EIN and then registering with New Mexico's Taxation and Revenue Department for your state Business Tax Identification Number (BTIN), which you'll also need to operate legally in the state.
Do You Need an EIN?
You need an EIN if your business is structured as one of the following:
- Limited Liability Company (LLC)
- Corporation (C-corp or S-corp)
- Partnership (general, limited, or LLC member-managed)
- Sole proprietorship that will hire employees
- Sole proprietorship that elects to be taxed as a corporation
- Any other business entity with employees or multi-member ownership
If you're a sole proprietor with no employees and no co-owners, you can use your Social Security Number for federal tax purposes. However, many sole proprietors still apply for an EIN to keep their personal and business finances separate and to establish business credit.
Materials and Documents You'll Need
Before you apply for an EIN, gather the following:
- Your Social Security Number or Individual Taxpayer Identification Number (ITIN)
- Your business's legal name, exactly as it appears in your Articles of Organization or Articles of Incorporation
- Your business's mailing address
- Your business's physical location in New Mexico (if different from mailing address)
- The month your business began or will begin operations
- The type of business structure (LLC, corporation, partnership, etc.)
- A description of your business activities
- Whether you will have employees
- Your principal business code (NAICS code). You can find this at www.census.gov/naics/
You do not need to have filed your Articles of Organization or Articles of Incorporation before applying for an EIN, but your business name must be legally reserved or registered with the New Mexico Secretary of State.
Step-by-Step: How to Get Your EIN Online
Step 1: Go to the IRS EIN Assistant
Visit the official IRS EIN application portal at irs.gov/ein. Click on "Apply for an EIN Online" or go directly to onlineservices.irs.gov.
The online application is available Monday to Friday, 7 a.m. to 10 p.m. Eastern Time. It is not available on federal holidays or during scheduled maintenance.
Step 2: Select Your Entity Type
Choose the business structure that matches yours: LLC, corporation, partnership, sole proprietorship, trust, non-profit organization, or other. The form will then show you options specific to that structure.
Step 3: Provide Your Principal Officer Information
Enter the name and Social Security Number of the business's principal officer, manager, or owner. This can be you or another individual. If the business is an LLC, this is typically the managing member or manager. If it's a corporation, this is the president or principal officer.
Step 4: Enter Your Business Information
Fill in:
- Business legal name (must match your Articles of Organization or incorporation documents)
- Business mailing address in New Mexico
- Business physical address (must be a street address, not a P.O. Box)
- County where your principal place of business is located
- Business start date or anticipated start date
- Principal line of business (your business activity description)
- NAICS code (North American Industry Classification System code)
Step 5: Indicate If You'll Have Employees
Answer whether you will have employees. If yes, specify the expected month of first payroll. This does not affect your EIN approval; it just helps the IRS coordinate with the Department of Labor for wage-related compliance.
Step 6: Review and Confirm
Review all information for accuracy. Errors now will require corrections later. Confirm that the information is correct and submit your application.
Step 7: Receive Your EIN Immediately
If your application is approved (most applications are approved instantly), the IRS will display your EIN on screen, provide a confirmation notice, and email you a copy. Write down your EIN or print the confirmation for your records.
Save or print the IRS confirmation document. You'll need this when setting up your business bank account and when registering with New Mexico's Taxation and Revenue Department.
Alternative Ways to Get Your EIN
By Phone
Call the IRS Business and Specialty Tax Line at 1-800-829-4933, Monday through Friday, 7 a.m. to 10 p.m. Eastern Time. A representative will help you apply over the phone and assign your EIN verbally. You will receive a confirmation letter by mail within 2 weeks.
By Mail (Form SS-4)
Download and print Form SS-4 (Application for an Employer Identification Number) from the IRS website at irs.gov/pub/irs-pdf/fss4.pdf. Complete the form, sign it, and mail it to the IRS address for New Mexico (shown in the form instructions). This method takes 4 to 6 weeks.
Online application is faster and more reliable. Mail and phone methods are best used only if you cannot access the internet or need a paper record of the application.
Registering with New Mexico's Taxation and Revenue Department
After receiving your federal EIN, you must register with the New Mexico Taxation and Revenue Department for a Business Tax Identification Number (BTIN). This number is used to report gross receipts tax, which is New Mexico's equivalent to sales tax.
New Mexico does not have a state sales tax. Instead, it imposes a gross receipts tax of 4.875% at the state level, with local rates adding another 0.375% to 4.5625%, for a combined rate of 5.25% to 9.4375% depending on your location and business type.
How to Register for Your BTIN
Registration is free and can be done online:
- Visit the New Mexico Taxation and Revenue Department website at tax.newmexico.gov.
- Click on "Register a Business" or "Apply for a BTIN."
- Provide your business name, EIN, business address, and a description of your business activities.
- Select the date you expect to start doing business in New Mexico.
- Submit your registration. No fee is charged.
You will receive a BTIN confirmation by email within a few business days. Some businesses receive their BTIN on the same day they register.
If you are an LLC, your BTIN registration and your BTIN number will reference your EIN. If you file your Articles of Organization with the Secretary of State, make sure the business name matches exactly what you used for your EIN application and BTIN registration.
Timeline: How Long Does It Take?
The federal EIN process is fast:
- Online application: EIN issued immediately (or within a few minutes if the system is busy)
- Phone application: EIN assigned verbally; confirmation letter mailed in 2 weeks
- Mail application: 4 to 6 weeks
New Mexico BTIN registration typically takes 1 to 3 business days after you submit your application online.
From start to finish, you can have both your EIN and BTIN within the same day if you apply online for the EIN and register online with the Taxation and Revenue Department the same day.
What to Do After You Get Your EIN
Once you have your EIN and BTIN, you can:
- Open a business bank account (you'll need to bring your EIN confirmation letter and your business formation documents)
- Hire employees and set up payroll withholding with the IRS
- Apply for business licenses required by your industry (through the New Mexico Regulation and Licensing Department)
- Apply for local business registration if your city or county requires one
- Start filing business tax returns with both the IRS (federal) and the Taxation and Revenue Department (state)
- Begin building business credit
Your EIN is permanent and does not expire, even if you change your business structure or location. Keep your EIN confirmation document in a safe place and use it for all business tax filings and official correspondence with the IRS.
Common Mistakes to Avoid
Mismatching business names. Make sure the business name you use on your EIN application exactly matches your Articles of Organization, your BTIN registration, and your bank account. Mismatches can cause tax filing problems later.
Using a P.O. Box as your physical address. The IRS requires a street address for your principal place of business. A P.O. Box is acceptable only for your mailing address.
Applying in the wrong person's name. The principal officer or owner's name must match their Social Security Number. If the business has multiple owners, only one person is named as the principal officer on the EIN application.
Forgetting to register with New Mexico. Some business owners stop after getting their federal EIN and forget to register for the state BTIN. You must do both to legally operate in New Mexico without risking penalties.
Not saving your confirmation. Keep your EIN confirmation document and BTIN confirmation email for at least seven years. You will need them for tax audits, bank account setup, and legal compliance proofs.
Tips for a Smooth Process
Apply online during business hours. The online IRS application is available 7 a.m. to 10 p.m. Eastern Time, Monday to Friday. Apply during the middle of the day to avoid peak traffic times when the system may be slow.
Have your NAICS code ready. Before you start the application, visit census.gov/naics and find the code for your business industry. This takes 5 minutes and makes the application faster.
Use your actual business start date. If you haven't started business yet, use your anticipated start date. This must be within the next few months; the IRS will not accept a start date more than 12 months in the future.
Set up your business bank account right away. Once you have your EIN confirmation, open a dedicated business bank account. Do not use your personal account for business expenses. Separating your finances makes tax time easier and protects your personal liability protection if your business is an LLC or corporation.
File your Articles of Organization with the Secretary of State before opening a bank account. Most banks require proof that your LLC or corporation is officially registered in New Mexico. You do not need to wait for approval of your Articles of Organization to apply for an EIN, but you should file them before your business opens.
Expected Results
After completing these steps, you can expect to have:
- A valid federal Employer Identification Number (9 digits in the format XX-XXXXXXX)
- A confirmation letter from the IRS showing your EIN, business name, and entity type
- A Business Tax Identification Number (BTIN) issued by the New Mexico Taxation and Revenue Department
- Authority to hire employees, open a business bank account, and conduct business in New Mexico
- The ability to file federal income tax returns (Form 1120, 1065, 1040-SE, or other) and New Mexico gross receipts tax returns
Your EIN does not mean you are fully compliant with all New Mexico business regulations. Depending on your industry, you may also need:
- State professional licenses (if you are in healthcare, law, real estate, etc.)
- Industry-specific permits (food service, construction, etc.)
- Local business registration or city/county licensing (varies by location)
- Sales tax permit (if you sell tangible goods)
Consult the New Mexico Regulation and Licensing Department website and your local city or county government to confirm all licenses and permits required for your specific business.
Disclaimer
This article is informational and is not legal or tax advice. Getting an EIN involves federal and state tax requirements that vary based on your business structure, ownership, and industry. Before filing, consult a qualified tax professional or attorney to ensure you meet all federal and New Mexico tax obligations, obtain the correct business licenses, and protect your personal liability. The IRS and the New Mexico Taxation and Revenue Department provide the definitive guidance on these topics.
For official guidance, visit the IRS at irs.gov and the New Mexico Taxation and Revenue Department at tax.newmexico.gov.