I file multiple returns for the family members. For my return I print and mail forms for Federal return. I go through many iterations of form printing because I want to 'go green' and double-side print the forms. You can not just choose double-side printing since some forms are one page and some are 3 pages and you would end up with form A on the back of form B which is a no-go. Being able to directly double-side print the forms properly with TT means fewer pages to file (which is good for postage and good for the environment).