Obtaining a Tax ID Number, officially known as an Employer Identification Number (EIN) in the United States, is a crucial step for businesses, nonprofit organizations, and certain individuals who need to interact with the Internal Revenue Service (IRS). Whether you’re starting a business, hiring employees, opening a bank account, or filing tax returns, having a Tax ID Number is often mandatory. This comprehensive guide will walk you through everything you need to know about how to get a tax ID number, why it’s important, who needs one, and step-by-step instructions to ensure a smooth application process.
What Is a Tax ID Number?
A Tax ID Number, or Employer Identification Number (EIN), is a unique nine-digit number assigned by the IRS to identify a business entity. Think of it as a Social Security Number (SSN) for your business — it’s how the government tracks your tax obligations and reporting. The IRS uses EINs to monitor business income, payroll taxes, and other forms of taxation. EINs are issued free of charge and are never reused, even if a business closes.
Important: While the terms “Tax ID Number” and “EIN” are often used interchangeably, other types of tax identification numbers exist, such as Individual Taxpayer Identification Numbers (ITINs) for non-resident aliens and Social Security Numbers for individuals.
Who Needs a Tax ID Number?
Not every individual or entity requires a Tax ID Number. However, certain situations make obtaining an EIN necessary or highly beneficial. Below are the primary categories of applicants.
Businesses That Need an EIN
- C corporations and S corporations – These legal structures require an EIN for federal tax filing.
- Partnerships and multi-member LLCs – Even if you don’t have employees, you need an EIN for tax reporting.
- Sole proprietorships with employees – If you hire workers, an EIN is mandatory for payroll taxes.
- Businesses that file pension or excise tax returns – Special reporting obligations require an EIN.
- Businesses that withhold taxes on income – Applies to foreign or non-resident employees.
Nonprofit Organizations and Trusts
Nonprofit organizations, charitable groups, and trusts need EINs to open bank accounts, receive grants, and file tax-exempt applications with the IRS. An EIN legitimizes these entities and is essential for compliance with tax rules.
Individuals Who Might Need an EIN
While most individuals use their Social Security Number for tax purposes, there are exceptions:
- Self-employed individuals who want to separate personal and business finances.
- Home-based businesses planning to expand.
- People hiring household employees (e.g., nannies, caregivers).
Even if not required, having an EIN can add professionalism and protect your personal information.
How to Get a Tax ID Number: Step-by-Step Process
The process of getting a Tax ID Number is straightforward if you follow the proper steps. The IRS offers several methods to apply: online, by fax, by mail, or by phone (for international applicants).
1. Determine Eligibility
Before applying, confirm that you’re eligible. To receive an EIN, you must have a legal presence in the U.S. or a valid U.S. tax reason. The IRS requires that the responsible party (e.g., owner, partner, or trustee) have a valid taxpayer identification number, such as an SSN, ITIN, or another EIN.
2. Choose Your Application Method
The IRS provides multiple ways to apply, but the speed and convenience vary.
Option A: Apply Online (Recommended)
The IRS online EIN application is the fastest and most efficient method.
- Visit the official IRS website at IRS EIN Online Application.
- Complete the form in one session — the application doesn’t save progress.
- You will receive your EIN immediately upon validation.
Note: The online application is only available to businesses with a principal address in the U.S. or U.S. territories and the responsible party must have an SSN, ITIN, or EIN.
Option B: Apply by Fax
If you’re unable to apply online, faxing IRS Form SS-4 is an alternative.
- Download Form SS-4 from the IRS website.
- Complete the form and include any required explanations.
- Fax it to the appropriate IRS fax number (based on your state).
- Processing time: Typically 4 business days.
Option C: Apply by Mail
Mailing Form SS-4 is another option, though it’s the slowest.
- Fill out Form SS-4 completely.
Mail it to:
Internal Revenue Service
Attn: EIN Operation
Cincinnati, OH 45999Processing time: Up to 4 weeks.
Option D: Apply by Phone (International Applicants Only)
If you don’t have an SSN or ITIN and your business isn’t located in the U.S., you can apply by phone.
- Call the IRS at 267-941-1099 (not a toll-free number).
- Available weekdays from 6 a.m. to 11 p.m. Eastern Time.
- An EIN will be issued during the call.
3. Fill Out IRS Form SS-4 Accurately
Regardless of your chosen method, you’ll need to provide the following information on Form SS-4:
Legal Name and Trade Name (if applicable)
Enter your business’s legal name exactly as it appears on official documents. If you operate under a different name (a “Doing Business As” or DBA), include that as the trade name.
Business Address
Provide the principal business location. A P.O. Box is acceptable only if it’s the only address, but a street address is preferred.
Responsible Party Information
This is the individual or entity that controls, manages, or directs the applicant entity and the disposition of its funds and assets. You must provide their name, title, and taxpayer identification number (SSN/ITIN/EIN).
Type of Entity
Clearly indicate your business structure: sole proprietorship, corporation, partnership, LLC, nonprofit, estate, etc.
Reason for Applying
Specify the reason you’re applying — options include “Started a new business,” “Hiring employees,” “Banking purposes,” etc.
First Date Wages Were Paid or Business Began
Include the date you first paid wages if applicable, or the date your business started operations.
Number of Employees Expected in the Next 12 Months
Estimate the number of employees you plan to hire. You can provide “0” if hiring isn’t expected.
Principal Business Activity
Describe the primary service or product offered. The IRS uses this to classify your business and determine tax responsibilities.
Understanding EIN Application Timeframes
Your method of application significantly affects how quickly you’ll receive your EIN.
| Application Method | Processing Time | Immediate EIN? |
|——————–|——————|—————-|
| Online | Immediate | Yes |
| Fax | 4 business days | No |
| Mail | 4 weeks | No |
| Phone (international)| During call | Yes |
Tip: For fastest results, apply online during business hours and ensure all information matches your official records.
Common Mistakes to Avoid When Applying for an EIN
Even with a simple process, errors can delay your application or invalidate your EIN. Avoid these common pitfalls:
1. Incomplete Forms
All fields on Form SS-4 must be completed. Missing information — especially the responsible party’s taxpayer ID — will hold up processing.
2. Incorrect Business Information
Double-check the legal name and address. Use exact matches from business licenses or formation documents.
3. Using a Third Party Without Proper Authorization
If you’re working with an accountant or legal advisor, ensure they have your permission. The IRS requires the responsible party’s valid identification.
4. Applying Multiple Times
Sometimes applicants don’t realize their EIN has already been issued and submit duplicate applications. Each business should only have one EIN.
5. Misunderstanding the Need for an EIN
Many new entrepreneurs believe every business needs an EIN. A sole proprietor with no employees and no excise tax obligations can use their SSN instead.
After You Get Your Tax ID Number: What to Do Next
Receiving your EIN is just the beginning. Here’s how to make the most of it.
1. Store Your EIN Safely
Keep your EIN in a secure location. Unlike SSNs, EINs can be shared publicly — it’s common to include them on business websites, contracts, or invoices.
However: Never share your EIN unnecessarily, as it could be used for identity theft or fraudulent activity.
2. Open a Business Bank Account
Most banks require an EIN to open a business checking or savings account. This separates your personal and business finances, which is important for accounting and liability protection.
3. Register for State and Local Taxes
An EIN is primarily for federal taxes, but many states require additional registration for sales tax, unemployment insurance, or employer withholding. Check your state’s department of revenue for requirements.
4. File Your Business Taxes
Once you have an EIN, you can file federal tax returns such as:
– Form 1120 (for corporations)
– Form 1065 (for partnerships)
– Form 941 (for payroll taxes)
Your EIN ensures accurate processing and faster refunds.
5. Hire Employees Legally
With your EIN, you can report wages to the IRS, withhold income and FICA taxes, and submit W-2 forms. You’ll also need to verify employee eligibility using Form I-9.
Special Cases: EINs for Non-Residents and Foreign Entities
Non-U.S. citizens or foreign entities that conduct business in the U.S. may also need an EIN. However, the application process differs slightly.
Eligibility Requirements
– You must have a valid reason to do business in the U.S. (e.g., hiring U.S. contractors, owning a rental property, forming a U.S. corporation).
– The responsible party must be reachable in the U.S. or via phone.
Application Process
– Complete Form SS-4 manually.
– Submit via fax or mail with a cover letter explaining foreign status.
– Call the IRS international line to apply by phone.
Note: Foreign applicants cannot use the online EIN application.
Example Scenario
Suppose you’re a Canadian investor forming a U.S. LLC to manage rental property in Florida. You’ll need an EIN to:
– Open a U.S. bank account for rent collection
– File federal and state tax returns
– Withhold taxes (if applicable)
This EIN allows you to remain compliant while operating across borders.
What to Do If You Lose or Forget Your EIN
Misplacing your EIN doesn’t mean you need to reapply. Here are several ways to retrieve it:
Check Previous Documentation
Look for your EIN on:
– IRS EIN confirmation letter (CP 575)
– Old tax returns
– Bank account records
– Business licenses
Contact the IRS
Call the IRS Business & Specialty Tax Line at 800-829-4933. You’ll need to verify your identity and provide business details.
Ask Your Financial Institution
If you’ve opened accounts with an EIN, your bank or credit union may have it on file.
Important: The IRS does not issue duplicate EINs. If you already have one, retrieving it is the best course of action.
Can You Cancel or Reactivate an EIN?
An EIN is permanent and cannot be canceled. Once issued, it remains associated with your business entity forever, even if the business closes.
However:
– You can close your business account with the IRS by filing a final tax return and indicating the closure.
– No reactivation is necessary — your EIN is always active, though it may not be used.
If you mistakenly believed your EIN was revoked, you don’t need to apply for a new one. The original EIN remains valid.
Myths About Tax ID Numbers Debunked
Misinformation about EINs can lead to confusion. Let’s clear up some common myths.
Myth 1: Every Business Must Have an EIN
False. Sole proprietors without employees and without excise tax obligations can use their SSN for tax filing.
Myth 2: EINs Cost Money
False. The IRS issues EINs for free. Beware of third-party websites that charge fees for services the IRS provides at no cost.
Myth 3: You Need an EIN to Get a Business License
Sometimes false. While many states and local governments request an EIN, others accept an SSN for sole proprietors. Check local requirements.
Myth 4: EINs Expire
False. EINs do not expire. They are permanent identifiers for your business.
Pro Tips for a Smooth EIN Application
To ensure your EIN application goes without a hitch, follow these expert recommendations:
- Apply as soon as your business is legally formed. Waiting too long can delay banking or hiring.
- Use a consistent business name. Any variations could slow IRS verification.
- Have your formation documents ready. If you’re an LLC or corporation, keep your articles of organization or incorporation handy.
- Avoid using temporary addresses. Use your permanent principal location.
- Don’t share your EIN on public forums. While public, it should be shared cautiously.
Final Thoughts: Why Getting a Tax ID Number Matters
Obtaining a Tax ID Number is more than just a bureaucratic formality — it’s a foundational step in building a credible, legally compliant business. From opening a bank account to filing federal taxes and protecting your personal identity, an EIN empowers you to operate professionally and securely.
The process is free, accessible, and designed to support entrepreneurs at every stage. Whether you’re launching a small online store or managing a multinational venture, having an EIN streamlines your financial operations and builds trust with banks, vendors, and government agencies.
By following this guide, you can confidently navigate the EIN application and set your business on the right fiscal path. Remember — the IRS is your ally in this process, and their resources are readily available to help you succeed.
Take action today: Visit the IRS website and apply for your EIN online. In less than 15 minutes, you’ll have the official identification your business needs to grow, thrive, and comply with U.S. tax laws.
Whether you’re a solopreneur, nonprofit leader, or international business owner, understanding how to get a tax ID number is an essential skill in modern business. Don’t delay — secure your EIN now and unlock the next phase of your success.
What is a Tax ID Number and why do I need one?
A Tax ID Number, also known as an Employer Identification Number (EIN), is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to identify businesses for tax purposes. This number is used for filing business tax returns, opening business bank accounts, applying for business licenses, and hiring employees. While most commonly associated with corporations and partnerships, even sole proprietors and certain individuals may require one depending on their financial activities.
For individuals, a Tax ID Number may be necessary if they operate a business with employees, run a trust or estate, or have specific tax obligations that require a separate identification number. For businesses, having an EIN helps separate personal and business finances, enhances credibility, and is often required when working with other companies or financial institutions. Whether you’re a freelancer hiring assistants or a large corporation, securing a Tax ID Number is an essential step in complying with U.S. tax regulations.
Can individuals obtain a Tax ID Number, and if so, how?
Individuals can obtain a Tax ID Number, particularly if they are self-employed, operate a sole proprietorship with employees, or have tax-reporting responsibilities that necessitate one. While most individuals use their Social Security Number (SSN) for personal tax filings, an EIN becomes necessary when the business structure demands it. This includes situations such as hiring employees, establishing a Keogh plan, or conducting business under a formal entity like an LLC.
To obtain an EIN as an individual, you can apply directly through the IRS website, which offers the fastest processing time. The application requires providing personal information such as your name, SSN, and business details. Alternatively, you can submit IRS Form SS-4 by fax or mail. It’s important to note that the IRS does not charge for EIN applications, and most individuals receive their EIN immediately upon completing the online process. Once issued, the EIN becomes permanent and can be used for all tax-related business activities.
What types of businesses need a Tax ID Number?
Most formal business structures, including corporations, partnerships, and limited liability companies (LLCs), are required to have a Tax ID Number. Any business that hires employees must obtain an EIN to report payroll taxes. Additionally, entities that file specific business tax returns—such as employment, excise, alcohol, or tobacco taxes—must use an EIN for compliance. Even if a business doesn’t have employees, financial institutions often require an EIN to open a business bank account.
Sole proprietors without employees may not always need an EIN, but there are exceptions. For example, if a sole proprietor files pension or excise tax returns, or hires independent contractors to whom they must issue 1099 forms, an EIN is necessary. Nonprofit organizations, government agencies, and trusts also require an EIN for tax reporting. Ultimately, understanding your business structure and tax obligations will help determine whether obtaining an EIN is mandatory or merely beneficial for operational and compliance purposes.
How do I apply for a Tax ID Number online?
The IRS provides a free, convenient online EIN application available on its official website. To use this service, the applicant must have a valid Taxpayer Identification Number (such as an SSN, ITIN, or existing EIN) and must be located in the United States or U.S. territories. The online application (Form SS-4) is only available to entities whose principal business, office, or legal residence is in the U.S. During the application, you will provide details like business name, address, type of entity, and reason for applying.
The online process typically takes about 10 to 15 minutes, and upon successful validation, you will receive your EIN immediately. This number can be saved or printed for future reference. It’s essential to ensure all information entered is accurate, as mistakes may cause delays in tax processing or compliance issues. After obtaining the EIN, you should keep a record of it and notify relevant parties such as your bank, accounting firm, or payroll service provider to ensure proper business operations.
Can I get a Tax ID Number if I don’t have a Social Security Number?
Yes, individuals without a Social Security Number (SSN) can still obtain a Tax ID Number by applying for an Individual Taxpayer Identification Number (ITIN) or using alternative methods for EIN applications. The ITIN is issued by the IRS to foreign nationals and resident aliens who have U.S. tax filing obligations but are not eligible for an SSN. Once you have an ITIN, you can use it to apply for an EIN if you are operating a business in the U.S.
If you’re applying for an EIN without an SSN, you can complete IRS Form SS-4 and submit it by fax or mail. In the space for the principal applicant’s SSN, you would write “Foreign” and include your ITIN or foreign tax ID. The IRS will then process your EIN request. While the online EIN application requires a valid SSN or ITIN, mailed or faxed submissions allow foreign applicants to obtain the necessary identification for tax compliance, ensuring international business owners and non-resident aliens can meet U.S. tax requirements.
What information is required when applying for a Tax ID Number?
When applying for a Tax ID Number, the IRS requires detailed information about the business and the responsible party. This includes the legal name and address of the business, the type of entity (e.g., corporation, partnership, sole proprietorship), and the business’s start or acquisition date. You must also provide the reason for applying (such as hiring employees or opening a bank account), the number of employees expected, and the highest anticipated tax liability in the first 12 months.
Additionally, the application requires the name, Social Security Number (SSN), or Individual Taxpayer Identification Number (ITIN) of the “responsible party”—typically the owner, partner, or corporate officer who controls the entity. You’ll also need to describe the primary business activity, such as retail sales, consulting, or manufacturing. Accuracy is critical, as inconsistencies can delay approval. Providing clear, verifiable information ensures a smooth application process and immediate issuance of your EIN.
Is a Tax ID Number the same as a Social Security Number?
No, a Tax ID Number (EIN) and a Social Security Number (SSN) are not the same, though both are used for tax identification purposes. An SSN is a unique nine-digit number issued by the Social Security Administration to U.S. citizens, permanent residents, and certain eligible non-resident workers. It is primarily used to track individual earnings and determine eligibility for Social Security benefits, but it also serves as a taxpayer ID for personal income tax filings.
In contrast, an EIN is issued by the IRS to businesses and other entities, functioning like a social security number for organizations. It’s used to identify businesses in tax filings, banking, and employment reporting. While sole proprietors without employees can use their SSN for business tax purposes, obtaining an EIN helps separate personal and business identities, enhances privacy, and is often necessary for formal business operations. Understanding the distinction helps ensure appropriate use and compliance with tax regulations.