Sigma 1040-DR is Sigma Tax Pro’s best-selling service package for complex returns. Sigma 1040-DR includes everything you need to make your tax preparation business successful this tax season. Our 1040-DR product comes in desktop and web based versions, if you need to file business returns such as Forms 1120 or 1065 you will need the desktop version. Sigma clients have their own dedicated account manager who will work with them throughout tax season to assist with tax preparation and software support. Sigma also offers a full range of bank products that can be used to ensure a best in class customer experience. Clients can receive their refunds quicker and easier choosing from direct deposit, in office check printing, as well as prepaid VISA/MasterCard options. Sigma 1040-DR is Sigma Tax Pro’s best-selling service package for complex returns. Sigma 1040-DR includes everything you need to make your tax preparation business successful this tax season. Our 1040-DR product comes in desktop and web based versions, if you need to file business returns such as Forms 1120 or 1065 you will need the desktop version. Sigma clients have their own dedicated account manager who will work with them throughout tax season to assist with tax preparation and software support. Sigma also offers a full range of bank products that can be used to ensure a best in class customer experience. Clients can receive their refunds quicker and easier choosing from direct deposit, in office check printing, as well as prepaid VISA/MasterCard options.