K-1 visa holders are eligible to apply and obtain a social security number upon entry to the United States. It is advisable that the K-1 visa holder waits around two weeks before applying (so that the Social Security Office can verify his/her arrival record). At the same time, the K-1 visa holder should not wait too long to apply either. If he/she applies within two weeks of the I-94 expiration, the social security office may not be able to process the request. When applying for the social security number, the K-1 visa holder needs to submit proof of his/her legal status in the U.S. by showing his/her original passport with original K-1 visa, valid I-94, and his/her original birth certificate.