Even though the requirements vary, car dealerships have to be especially careful when dealing with such ones. Nonresidents can get away with purchasing a car worth less than $10,000 without an social security number. But, when the value of the car exceeds this amount, the dealership will have to file a Form 8300. For this, you will need an SSN. The IRS recommends using the ITIN (Individual Taxpayer Identification Number) if the person has one. If not, then item 6 of Form 8300 should be left blank. Item 6 requests for the tax identification number which is the same as the SSN. This enables alien residents to purchase cars worth over $10,000. Item 14 of Form 8300 must not be empty. The individual's name and address must be verified and entered into this space. This Item 14 allows you to include the information of any other means of identification. You can include the ID description and the issuer.