ITIN vs EIN: Key Differences Explained (2026)

What Is an ITIN?

An ITIN is a nine-digit tax processing number issued by the IRS to individuals who are required to have a US taxpayer identification number but are not eligible for a Social Security Number (SSN). ITINs are formatted like SSNs (XXX-XX-XXXX) but always begin with the digit 9.

The IRS issues ITINs to non-resident aliens, their spouses, and dependents who need to file US tax returns or are claimed on someone else's return. Foreign nationals who earn income from US sources, such as freelancers, investors, or Amazon sellers, often need an ITIN to comply with IRS reporting requirements.

You apply for an ITIN using IRS Form W-7 along with supporting identity documents. The standard IRS processing time is 7-11 weeks. An ITIN does not authorize work in the US or provide eligibility for Social Security benefits.

What Is an EIN?

An EIN (Employer Identification Number) is a nine-digit number assigned by the IRS to business entities operating in the United States. Think of it as a Social Security Number for your business. EINs are formatted as XX-XXXXXXX.

Businesses need an EIN to hire employees, open business bank accounts, file business tax returns, and apply for business licenses. LLCs, corporations, partnerships, non-profits, trusts, and estates all use EINs. Even sole proprietors may need one if they have employees or operate as a specific entity type.

You can apply for an EIN online through the IRS website (if you already have an SSN or ITIN) and receive it immediately. By mail or fax, processing takes 4-5 weeks.

ITIN vs EIN: Side-by-Side Comparison

Do You Need an ITIN or an EIN?

The answer depends on whether you need a tax ID for yourself or for a business. Here is a quick decision guide:

When You Need Both an ITIN and an EIN

Non-US residents who own or operate a US business frequently need both numbers. This is one of the most common scenarios for international entrepreneurs.

If you form a US LLC as a foreign national, the IRS requires you to list a "responsible party" on the EIN application (Form SS-4). That responsible party needs either an SSN or an ITIN. Since you do not have an SSN, you need an ITIN first, then you use it to apply for an EIN online.

Here is the typical sequence for non-US business owners:

1. Apply for an ITIN using Form W-7 (the personal tax ID for you as an individual)
2. Receive your ITIN from the IRS (7-11 weeks if applying directly)
3. Apply for an EIN online using your ITIN as the responsible party's tax ID (issued immediately)
4. Use the EIN to open a US business bank account, hire employees, and file business taxes

Without an ITIN, you can still get an EIN by mailing or faxing Form SS-4, but processing takes 4-5 weeks and you lose the convenience of instant online issuance.

ITIN vs SSN

While ITIN and SSN share the same nine-digit format, they serve different populations and carry different rights. An SSN is issued by the Social Security Administration to US citizens, permanent residents, and authorized workers. An ITIN is issued by the IRS strictly for tax purposes to individuals who cannot obtain an SSN.

An SSN grants work authorization and access to Social Security benefits. An ITIN does neither. You cannot use an ITIN to prove legal work status, and it does not make you eligible for Social Security, Medicare, or the Earned Income Tax Credit.

If you later become eligible for an SSN (for example, through a change in immigration status), you should stop using your ITIN and notify the IRS to consolidate your tax records. For a deeper breakdown, see our guide on ITIN vs SSN differences.

ITIN vs EIN vs SSN

All three are tax identification numbers issued by the US government, but each serves a distinct purpose:

• SSN (Social Security Number): issued to US citizens, permanent residents, and authorized workers. Used for employment, tax filing, and government benefits.
• ITIN (Individual Taxpayer Identification Number) : issued to individuals who have US tax obligations but cannot get an SSN. Used only for tax purposes.
• EIN (Employer Identification Number): issued to business entities. Used for business tax filings, hiring, and banking.

A single person can hold all three: an SSN (if they are a US citizen or resident), or an ITIN (if they are not), plus an EIN for any business they own. The ITIN and SSN are mutually exclusive, so you should only have one or the other, never both at the same time.

Alternatives to ITIN

Not everyone needs an ITIN. Depending on your situation, other options may be available. If you are eligible for an SSN through work authorization or immigration status, that should be your first choice, since an SSN provides broader benefits than an ITIN.

Some non-US businesses can use an EIN alone for certain transactions without needing an individual ITIN. In other cases, a foreign tax identification number from your home country may satisfy reporting requirements.

For a full rundown of your options, read our guide on alternatives to ITIN.