ITIN vs TIN: What's the Difference?

Why People Confuse ITIN and TIN

The confusion comes from how the two words are used in everyday paperwork. A bank form asks for a “TIN.” A payment processor asks for a “tax ID.” The IRS asks for an “identifying number.” All three are asking the same question: which of the five taxpayer identification numbers belongs to you? They are not asking for a separate document called a TIN, because no such document exists. There is no TIN application form, no TIN card, and no TIN office. TIN is a classification, in the same way that “vehicle” is a classification covering cars, trucks, and motorcycles.

This matters practically. If you have been told you need to “get a TIN” before you can open an account, invest, or get paid, what you actually need is the specific TIN type you qualify for. For most people reading this page, that is an ITIN.

The 5 Types of TIN Compared

Every taxpayer identification number recognised by the IRS, with its format, who receives it, who issues it, and what it costs.

Four of the five are free. The PTIN is the only TIN with an annual fee, because it is a professional registration rather than a taxpayer identifier. If someone quotes you a government fee to obtain an ITIN, that fee is not from the IRS — see our ITIN cost guide for what you should and should not be paying.

Where the ITIN Sits Inside the TIN Family

The ITIN exists to fill one specific gap. The US tax system requires every person with a filing obligation to have an identifying number, but the Social Security Administration only issues SSNs to people authorised to work in the United States. That left millions of people — foreign investors, non-resident business owners, spouses and dependents of US taxpayers — with a legal duty to file and no number to file under. The IRS created the ITIN in 1996 to close that gap.

How to Recognise an ITIN

An ITIN always begins with the digit 9and follows the same nine-digit spacing as an SSN (9XX-XX-XXXX). The fourth and fifth digits fall in the ranges 50–65, 70–88, 90–92, or 94–99. This is why an ITIN visually resembles an SSN on a form but is never mistaken for one by IRS systems: no SSN begins with 9.

What the ITIN Does and Does Not Do

ITIN Compared to Each Other TIN Type

ITIN vs SSN

Both identify an individual, and both use the XXX-XX-XXXX format. The difference is eligibility and scope. The SSN carries work authorisation and Social Security entitlement; the ITIN carries neither. You cannot hold both at once — if you become eligible for an SSN, it replaces the ITIN. Full breakdown in our ITIN vs SSN comparison.

ITIN vs EIN

These are not alternatives to each other — they identify different kinds of taxpayer. An ITIN identifies a person; an EIN identifies a business entity. Non-US founders routinely need both: the EIN for the LLC and the ITIN for the owner's personal return. See the full ITIN vs EIN comparison.

ITIN vs ATIN

The ATIN is a temporary number for a child placed in a US home through a pending domestic adoption, where the adoptive parents need to claim the child before the adoption is final and an SSN can be issued. It is applied for on Form W-7A. An ITIN, by contrast, is used for a child who is not a US citizen or resident and is claimed as a dependent on a return.

ITIN vs PTIN

The PTIN is not a taxpayer number at all — it identifies the professional who prepared someone else's return, so the preparer does not have to print their own SSN on every client filing. A preparer still needs their own SSN or ITIN for their personal taxes. The PTIN renews annually and costs $19.75.

Which TIN Do You Need?

If your answer is ITIN, the next step is the ITIN application process and the supporting documents the IRS requires.

ITIN vs TIN at a Glance