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ITIN for Non-US Residents: Complete Guide 2026 If you're a non-US resident wanting to start a business in the United States, you'll need an ITIN (Individual Taxpayer Identification Number). This guide explains everything you need to know about getting your ITIN without visiting America. What is an ITIN? An ITIN is a 9-digit tax processing number issued by the Internal Revenue Service (IRS). It's designed for people who don't have and aren't eligible for a Social Security Numb