Obtaining an ITIN (Individual Taxpayer Identification Number) is crucial for non-residents in the United States. The IRS issues this number and serves as a tax processing number for individuals who need a U.S. taxpayer identification number but are not eligible to obtain a Social Security Number (SSN). The ITIN is essential for complying with U.S. tax laws and potentially receiving a refund against U.S.-sourced income. It is required for filing tax returns, opening U.S. bank accounts, securing loans, and facilitating other financial activities in the U.S. For non-residents involved in business or financial transactions, an ITIN is an indispensable requirement.