I don't have social security # but I supported all of last year. Am I allowed to claim him?
not without an SSN
also (s)he must have lived with you the entire year. temporary absences are ignored
their gross income must be less than $5050
Thank you for the info! He only worked 1 week the entire year. Would my refund increase significantly if I were able to get his SS and claim him?
If you qualify to claim him as a dependent, you will get the Other dependent credit of $500, and your refund will increase by $500.
Please read this TurboTax article on Who Can I Claim as a Tax dependent?