ITIN: What It Is, How to Get It, and What It Does

If you have been living in the United States for a while without an ITIN, you may be leaving money on the table, missing out on credit-building opportunities, and making life harder than it needs to be. The ITIN is one of the most important documents for any immigrant who works and lives in this country — yet many people still do not know exactly what it is, how to get one, or what it actually does in everyday life.

What Is an ITIN and What Does It Do?

An ITIN (Individual Taxpayer Identification Number) is a tax identification number issued by the IRS — the U.S. tax agency. It follows the format 9XX-XX-XXXX and always begins with the digit 9. The IRS created it specifically so that people who do not qualify for a Social Security Number (SSN) can meet their tax obligations in the United States.

What the ITIN does in practice: First and most importantly, it lets you file federal and state tax returns, which is required if you have U.S. income above certain thresholds. But the uses extend well beyond taxes: opening bank accounts (many national banks like Wells Fargo, Bank of America, and Chase accept it), building credit history with secured cards and credit builder loans, applying for ITIN mortgages with specialized lenders, completing notarial and legal procedures, and in some states obtaining a driver's license.

What the ITIN does NOT do: It does not authorize you to work in the United States, is not proof of immigration status, does not replace the SSN for all purposes, and does not change your immigration situation. It is exclusively a number for tax purposes.

Who Needs an ITIN?

The IRS assigns ITINs to anyone who has a U.S. tax filing obligation but does not have and is not eligible for a Social Security Number. In practice, this covers several groups.

Undocumented immigrants: The most common group that uses ITINs. If you work in the U.S. without legal residency documents, you cannot obtain an SSN, but you are still required to file taxes if your income exceeds the IRS threshold. The ITIN is your tool for doing so.

Immigrants on non-work visas: People with tourist visas (B-1/B-2), student visas (F-1/M-1 without work authorization), investment visas, or other visas that do not authorize formal employment but who may have income from other sources (investments, rental income, reportable foreign income) need an ITIN to file.

International workers: People outside the U.S. who receive income from American sources (dividends, royalties, rental income from U.S. property) must report that income to the IRS and need an ITIN to do so.

Foreign students: F-1 students who receive taxable scholarships or have income from CPT/OPT internships but do not have an SSN need an ITIN for their returns.

Spouses or dependents of foreign nationals: If your spouse has an SSN or work visa but you do not, or if you have dependents without SSNs who you can claim on your return, each person needs their own ITIN.

How to Apply for an ITIN: Step by Step

Getting an ITIN involves completing IRS Form W-7 and submitting it with supporting documentation. The process is not complicated, but it has specific steps you must follow.

Form W-7: This is the official ITIN application. Download it at irs.gov (Form W-7, "Application for IRS Individual Taxpayer Identification Number"). You complete it in English, indicate the reason you qualify (there is a list of options on the form), and sign it. The form is submitted together with your federal tax return, which serves as the "reason" for needing the number.

Required documents: The IRS accepts 13 types of documents as evidence of identity and foreign status. The most common and widely accepted is a valid passport from your home country, which satisfies both requirements (identity and connection to another country) on its own. If you do not have a valid passport, you can combine other documents: a valid U.S. visa plus national ID, a foreign driver's license plus birth certificate, or a national ID card from your country plus a visa approval letter. Documents must be originals or copies certified by the issuing agency. Simple photocopies are not accepted.

Where to send or bring your application: You have three options. First option: mail your W-7, tax return (or applicable exception), and original documents directly to the IRS (Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342). The risk is sending original documents by mail. Second option, most recommended: visit an IRS-certified Acceptance Agent. These are accountants, tax preparers, banks, or community clinics that the IRS has certified to verify your documents on-site — no need to mail originals. You can find Acceptance Agents in Florida at irs.gov/individuals/acceptance-agent-program. Third option: visit an IRS Taxpayer Assistance Center (TAC) in person in cities like Miami, Orlando, Tampa, or Fort Lauderdale. Bring all your original documents and they can process your application right there.

Processing time: The IRS processes ITIN applications in approximately 7 to 11 weeks. During peak tax season (January through April) the process can extend to 14 weeks. Once approved, you will receive your number by mail on Form CP565.

ITIN to Build Credit and Open Bank Accounts

One of the most valuable uses of an ITIN is that it lets you begin building your financial history in the United States long before you have an SSN.

Bank accounts: Wells Fargo, Bank of America, Chase, Citibank, and dozens of credit unions in Florida accept ITINs to open checking and savings accounts. Having a bank account is the first step toward any financial history. Important tip: always try to open the account in person at a branch, not online, since digital forms often only have a field for SSN.

Secured credit cards: With an ITIN you can apply for secured cards at institutions like Self Financial, OpenSky, and certain credit unions. These cards require a security deposit ($200–$500) that becomes your credit limit. Use them for everyday expenses and pay the full balance every month. After 6 to 12 months of responsible use, you will begin to see your first FICO score.

Credit builder loans: Products designed specifically for credit building. You make monthly payments that the bank holds until you complete the loan, at which point you receive the accumulated money. All payments are reported to the three credit bureaus (Equifax, Experian, TransUnion), steadily building your history.

ITIN mortgages: Once you have 2 years of tax returns filed with an ITIN, a credit score of 620 or higher, and savings for the down payment (15–20%), you can apply for a mortgage with specialized lenders. In 2026, after the FHA program eliminated ITIN access, Non-QM (non-qualified mortgage) loans from private lenders are the main alternative available.

ITIN vs. Social Security Number: Key Differences

It is common to confuse the ITIN with the Social Security Number or to think they are equivalent. They are not, and understanding the differences avoids problems.

SSN (Social Security Number): Assigned by the Social Security Administration (SSA) to U.S. citizens, permanent residents, and foreigners with work authorization. Used to work legally, access Social Security and Medicare benefits, and for virtually all identification purposes in the U.S. It is the primary identification number in the system.

ITIN (Individual Taxpayer Identification Number): Assigned by the IRS exclusively for tax purposes. Does not authorize work, does not give access to federal benefits like Social Security or Medicare, and is not valid as identification in most non-tax contexts. Its only official purpose is to let you meet tax obligations.

Key differences at a glance: The SSN requires legal authorization to work in the U.S.; the ITIN does not have that requirement but also does not grant that authorization. The SSN gives access to future Social Security benefits; the ITIN does not, although taxes paid with an ITIN may in some cases count if you later obtain an SSN and legal residency. The SSN is permanent; the ITIN expires if not used in tax returns for three consecutive years.

**Can an ITIN become an SSN?** Not directly, but if you ever qualify for an SSN (for example, through a change in immigration status), you notify the IRS and credit agencies can link your ITIN history to the new SSN — preserving the credit-building work you did.

ITIN Renewal

The IRS introduced an expiration policy for ITINs in 2015. An ITIN expires automatically if it was not used on a federal tax return for the three most recent tax years. ITINs assigned before 2013 with certain middle-digit formats also expire on a rolling basis.

How to know if your ITIN has expired: If your ITIN has middle digits (positions 4 and 5) between 70–88 or 90–99, or if you have not used it in the last three years, it has likely expired and you need to renew it before filing your next return.

How to renew: The renewal process uses the same Form W-7, checking the "Renewal" box instead of new application. You do not need to include a tax return if you are only renewing. You do need to include the required identity documents. Processing time is similar: 7 to 11 weeks.

Why renewing on time matters: If you file your return with an expired ITIN, the IRS will process the return but reject any claimable tax credits (such as the Child Tax Credit) until the ITIN is renewed. This can delay your refund by several months.

Frequently Asked Questions

**Does it cost money to get an ITIN?** Filing directly with the IRS (by mail or at a TAC) is free. Acceptance Agents are independent and may charge fees for their tax preparation service, but there should be no additional charge just for verifying your documents for the ITIN. Be wary of anyone charging excessive fees just for the ITIN process.

**Does the ITIN protect me from deportation?** No. The ITIN is a tax number and has no relationship to your immigration status, nor does it provide any legal protection against immigration enforcement. However, having a tax history may be viewed positively in certain immigration processes as evidence of good faith and community contribution.

**Can the IRS share my information with ICE?** No. The IRS is legally prohibited from sharing tax return information with other federal agencies, including immigration agencies, under Section 6103 of the Internal Revenue Code. Filing taxes with an ITIN is safe and private.

**Can I have two ITINs?** No. If you already have an ITIN and obtain an SSN, you must stop using the ITIN and notify the IRS. If you lose or cannot remember your ITIN, you can call the IRS (1-800-829-1040) to recover it — do not apply for a new one.

**What documents from my home country does the IRS accept?** The IRS accepts passports from any country as the best option, but also accepts: government-issued national ID cards, foreign driver's licenses, birth certificates (for minors), medical records (for children under 6), and other specific documents listed in the W-7 instructions.

Your Next Step

Getting your ITIN is the starting point for everything else: filing taxes legally, opening your bank account, starting to build credit, and eventually applying for a mortgage. It is not a complicated process if you prepare well. At Atton Finance we connect immigrant families with IRS-certified Acceptance Agents and bilingual tax preparers who understand your situation and can guide you through every step — from getting your ITIN to maximizing your tax refund. **Ready to get started? Request your free tax preparation evaluation today and take the first step toward your financial stability in the United States.**