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Please complete your CSS Profile online. The Harvard College CSS code number is 3434. Once your CSS Profile has been completed, you will be able to use the College Board’s Institutional Documentation Service (IDOC) to submit your tax forms and any other supplemental forms that may be required. Remember, it is important to provide your Social Security Number, if you have one, when you register for CSS Profile; Harvard will use this unique number to identify your data before loading any electronic records. NOTE: If you are a returning student and do not have a Social Security Number, please provide your Harvard ID number in the SSN field when you register for the CSS Profile. If you are a prospective/entering student and do not have a Social Security Number, please be sure to provide the same first, last and middle name, as well as birth date on the CSS Profile that you provided on your Harvard admissions application.