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IRS.gov Website
Instructions for Form 1040
taxmap/instr/i1040gi-020.htm#en_us_publink24811vd0e50143

Identity Protection PIN(p76)

rule
For 2015, if you received an Identity Protection Personal Identification Number (IP PIN) from the IRS, enter it in the IP PIN spaces provided below your daytime phone number. You must correctly enter all six numbers of your IP PIN. If you didn't receive an IP PIN, leave these spaces blank.
caution
New IP PINs are issued every year. Enter the latest IP PIN you received. IP PINs for 2015 tax returns generally were sent in December 2015.
If you are filing a joint return and both taxpayers receive an IP PIN, only the taxpayer whose social security number (SSN) appears first on the tax return should enter his or her IP PIN. However, if you are filing electronically, both taxpayers must enter their IP PINs.
If you need more information, go to www.irs.gov/Individuals/Understanding-Your-CP01A-Notice. If you received an IP PIN but misplaced it, call 1-800-908-4490.