How to Get an ITIN

What an ITIN is (and what it’s not)

An ITIN (Individual Taxpayer Identification Number) is a tax number the IRS uses for people who need to file U.S. taxes but don’t have a Social Security number. It helps the IRS match your tax records to you.

An ITIN is only for taxes. Getting an ITIN does not change your immigration status, and filing taxes is separate from immigration rules.

If you’re dealing with IRS notices, unfiled returns, or tax debt, having the right identity information can be important for resolving your tax situation. It’s still normal to feel stressed—there are legitimate steps forward.

Who may need an ITIN

People commonly apply for an ITIN if they must file a U.S. tax return but cannot get a Social Security number. This can include some nonresident and resident taxpayers.

Some people also need an ITIN for dependents listed on their tax return. Rules depend on your situation and the type of return you file.

If you received an IRS letter or you’re trying to file back taxes, the best next step is to understand what the IRS is asking for and whether you need to request an ITIN (or correct one). When you’re unsure, getting a second opinion from a qualified professional can help you avoid mistakes.

How to apply for an ITIN (basic steps)

In general, applying for an ITIN involves completing an IRS application and providing identity documents. You typically submit the application with required proof of identity and foreign status (as applicable).

The exact forms and document requirements can vary based on your age, whether you’re applying for yourself or a dependent, and the type of tax situation. Because requirements can change, it’s important to follow the IRS instructions for the current year.

If your goal is to address tax debt or unfiled returns, it can help to plan your filing steps too. Filing your taxes and resolving any IRS issues are separate tasks, and the right order can depend on the notices you received.

If you already have an ITIN: checking status and updates

Some people already have an ITIN but later learn it may need renewal or may not be active for current filing needs. An ITIN’s status matters for whether a return can be processed correctly.

If you’re dealing with IRS notices, your letter may mention issues like mismatch, missing information, or processing problems. Those problems can sometimes happen even when you have an ITIN—so it’s worth reading the notice carefully.

If you want help, TaxCairn is a free matching service (not a law firm) that can connect you with tax-resolution professionals who work with ITIN questions and IRS letters. You can usually find support in your preferred language.

ITIN and tax debt: what to do next

If you owe the IRS, have unfiled back taxes, or received an audit/notice, your tax resolution plan often includes filing the missing returns (if required), responding to the IRS, and then deciding how to manage any balance due.

For many people, the practical next steps are: (1) understand which years the IRS is focused on, (2) confirm you have the correct tax identity information for filing, and (3) consider payment options. The best path depends on your numbers, your history, and your deadlines.

Costs vary a lot by case and state. Many tax-resolution professionals charge roughly $1,500–$5,000 flat fee for many common tax-debt situations, and more for complex cases. IRS payment plans can start around about $25/month in some situations, but it depends on what you owe and your circumstances. If you’re considering an Offer in Compromise, there is often an application fee of a few hundred dollars unless you qualify for a waiver.

Getting help without guessing (and what it may cost)

It’s okay to ask for help—especially if you’re dealing with notices, back taxes, or possible IRS collection actions like a lien (a legal claim on property) or a levy (when the IRS actually takes money or property).

TaxCairn is a free matching service, not a law firm or tax preparer. Participating professionals pay TaxCairn a flat fee for matching you with help. That means you can start by exploring options without paying TaxCairn.

To find the right professional, use get matched and share a short description of your situation. You can also learn about what help may be available through services and read related explanations in guides. Avoid anyone who guarantees results or promises a specific settlement—legitimate help should be based on your actual facts, not promises.