If you are serving in a combat zone or in a contingency operation (or are hospitalized as a result of an injury received while serving in such an area or operation), you have at least 180 days after you leave the designated combat zone/contingency operation to file and pay taxes. See Publication 3, Armed Forces' Tax Guide. If you are determined by the Service to be affected by a presidentially declared disaster or a terroristic or military action, then you may have up to one year after the due date of your return to file and pay taxes, depending on the deadline specified by the Service.