TN 45 (11-11)
Obtain an SSA-21 (Supplement of Claim of Person Outside the U.S.) if the trip was (or will be) more than three months in duration.
If the trip was (or will be) three months or less, see GN 02605.210.
Obtain an SSA-7163 (Questionnaire About Employment or Self-Employment Outside the U.S.).
See RS 02605.020 for possible other development.
RS 02640.001 Determining Citizenship
RS 02610.001 Alien Nonpayment Provisions
GN 05010.020 Determining the Tax Status of a Claimant in the U.S. or a Possession