Free Tax Preparation! Outsource Tax Service has provided exceptional tax preparation and tax planning solutions to our clients across the United States since 2003. We have built long-term relationships with most of our clients and we are their first stop when it comes to tax preparation and tax planning. Year after year, we have grown our client base due to our dedicated, professional client service. Our tax professionals are available year-round. We are there daily to provide our clients with any support they need.