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IRS.gov Website
Instructions for Form 1042-S
taxmap/instr2/i1042s-034.htm#en_us_publink100033323

taxmap/instr2/i1042s-034.htm#TXMP2241748e
Box 13l, Recipient’s Date of Birth(p29)

rule
Use box 13l to enter the recipient’s date of birth if it is available in the withholding agent's electronically searchable information. Box 13l is optional. The correct format if entered is YYYYMMDD.
taxmap/instr2/i1042s-034.htm#TXMP177e0b6d
Note.(p29).
Starting in calendar year 2017, the withholding agent will be required to report either the recipient's foreign tax identification number or the recipient's date of birth.