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IRS.gov Website
Instructions for Form 1040-EZ
taxmap/instr/i1040ez-014.htm#en_us_publink12063zd0e1879circleb

Social Security Number (SSN)(p9)

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An incorrect or missing SSN can increase your tax, reduce your refund, or delay your refund. To apply for an SSN, fill in Form SS-5 and return it, along with the appropriate evidence documents, to the Social Security Administration (SSA). You can get Form SS-5 online at www.socialsecurity.gov, from your local SSA office, or by calling the SSA at 1-800-772-1213. It usually takes about 2 weeks to get an SSN once the SSA has all the evidence and information it needs.
Check that both the name and SSN on your Forms 1040EZ, W-2, and 1099 agree with your social security card. If they do not, your exemption(s) and any earned income credit may be disallowed, your refund may be delayed, and you may not receive credit for your social security earnings. If your Form W-2 shows an incorrect name or SSN, notify your employer or the form-issuing agent as soon as possible to make sure your earnings are credited to your social security record. If the name or SSN on your social security card is incorrect, call the SSA.
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IRS individual taxpayer identification numbers (ITINs) for aliens.(p9)
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If you are a nonresident or resident alien and you do not have and are not eligible to get an SSN, you must apply for an ITIN. For details on how to do so, see Form W-7 and its instructions. It takes 6 to 10 weeks to get an ITIN.
If you already have an ITIN, enter it wherever your SSN is requested on your tax return.
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Note.(p9)
An ITIN is for tax use only. It does not entitle you to social security benefits or change your employment or immigration status under U.S. law.
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Nonresident alien spouse.(p9)
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If your spouse is a nonresident alien, you cannot use Form 1040EZ unless he or she has either an SSN or an ITIN.