If illegal do not pay taxes?

Why Americans create W7 form?
Update: General Instructions Purpose of Form Use Form W-7 to apply for an IRS individual taxpayer identification number (ITIN). An ITIN is a nine-digit number issued by the U.S. Internal Revenue Service (IRS) to individuals who are required for U.S. tax purposes to have a U.S. taxpayer identification number but who do... show more General Instructions
Purpose of Form
Use Form W-7 to apply for an IRS individual taxpayer identification number (ITIN). An ITIN is a nine-digit number issued by the U.S. Internal Revenue Service (IRS) to individuals who are required for U.S. tax purposes to have a U.S. taxpayer identification number but who do not
have, and are not eligible to obtain, a social security number (SSN). Who Must Apply Any individual who is not eligible to obtain an SSN but who must furnish a taxpayer identification number must apply for an ITIN on Form W-7. Examples include the following. c An alien individual eligible to be claimed as a dependent on a U.S. tax return but who is not eligible to obtain an SSN. To determine if an alien individual is eligible to be claimed as a dependent on a U.S. tax return, see Pub. 501, Exemptions, Standard Deduction, and Filing Information, and Pub. 519. c An alien spouse eligible to be claimed as an exemption o a U.S. tax
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