Nonimmigrant and immigrant visa application fees paid to the U.S. Department of State (DOS) for certain visa categories changed on September 12, 2014. DOS advises that all visa applicants must pay the fee amounts in effect on the day they pay, with the exception of immigrant visa application processing fees paid domestically to the National Visa Center, which will be effective as of the date of billing. Fees that decreased are not refundable. If,  however, a nonimmigrant visa fee was paid before September 12, 2014, and the visa interview is on or before December 11, 2014, the applicant does not have to pay the increased difference between the new and old fee amounts. If, however, the visa fee was paid before September 12, 2014, and the visa interview is on or after December 12, 2014, the applicant will have to pay the difference. For more specific information, see the “Fees for Visa Services” section of the DOS website.