UltimateTax Service, Inc. is a leader in providing tax professionals with quality tax software and year-round assistance. Since 2006 we have secured relationships and contracts with vendors that we respect. All of our Account Managers and Support Personnel are located in Muscatine, Iowa. Many of our co-workers work year round and we have some seasonal employees to help as well. We provide our staff with the latest training and technology so they can quickly help you in a professional manner.