Understanding the ITIN Number: A Guide on How to Get One

August 31, 2023
2 min read
Understanding the ITIN Number: A Complete Guide for What It’s Used For and How to Get One | ITIN Support

Are you a foreign national or a resident alien in the United States? Then you might have encountered the term ITIN number. In this comprehensive guide, we'll dive into everything you need to know about the ITIN number - from its definition, purpose, eligibility criteria, to the application and renewal processes. Whether you're applying for an ITIN for the first time or need to renew one, ITIN Support is here to assist you every step of the way. Visit our main page for more information here.

What is an ITIN Number?

An ITIN, or Individual Taxpayer Identification Number, is a tax processing ID issued by the IRS to individuals who must have a U.S. taxpayer ID but aren't eligible for a Social Security Number (SSN). It's a nine-digit number, starting with "9" and formatted like an SSN. ITINs are vital for tax reporting purposes, helping integrate a wide range of individuals into the tax system. Learn more about ITIN numbers on our blog.

The Purpose of an ITIN Number

Primarily used for tax filing, an ITIN does not provide legal working status or qualify holders for Social Security benefits. However, it's essential for:

  • Filing U.S. federal tax returns
  • Claiming tax treaty benefits
  • Obtaining financial and educational services

For a detailed list of ITIN uses, check out this https://www.itin.support/post/navigating-the-itin.

Who Needs an ITIN Number?

ITINs are required by:

  • Nonresident and resident aliens filing U.S. tax returns
  • Dependents or spouses of U.S. citizens/resident aliens
  • Foreign nationals not eligible for SSNs but with U.S. tax obligations

For more on ITIN eligibility, visit our pricing page for detailed service options.

How to Apply for an ITIN Number

Applying involves completing IRS Form W-7 and providing proof of identity and foreign status. You can submit your application via mail, in person at an IRS office, or through a Certified Acceptance Agent (CAA) near you. Finding a CAA near you is crucial for a smooth application process. The processing time can vary, so it's wise to apply early to avoid delays. For a quick application, discover the fastest way to get your ITIN number through our specialized services.

Renewing Your ITIN Number

ITINs expire if not used on a tax return at least once in three consecutive years. Renewing requires a new Form W-7 but no tax return unless you're claiming specific benefits. Early renewal is recommended to prevent processing delays. For detailed renewal guidance, click here.


An ITIN number is indispensable for many individuals navigating the U.S. tax system. While the application and renewal process can seem daunting, ITIN Support simplifies it. Our team of certified professionals is dedicated to ensuring you receive your ITIN swiftly and efficiently, letting you focus on your goals in the U.S. Contact us for a free consultation and experience our 100% satisfaction guarantee.