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IRS.gov Website
Instructions for Form 1040-A
taxmap/instr/i1040a-008.htm#TXMP4af07ea2

Social Security Number (SSN)(p13)

rule
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 your SSN on your Forms W-2 and 1099 agrees with your social security card. If not, see page 75 for more details.
taxmap/instr/i1040a-008.htm#TXMP292fdcb7
IRS individual taxpayer identification numbers (ITINs) for aliens.(p13)
rule
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.
Note.(p13) 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.

taxmap/instr/i1040a-008.htm#TXMP07ae1a87
Nonresident alien spouse.(p13)
rule
If your spouse is a nonresident alien, he or she must have either an SSN or an ITIN if: