By State House News Service For single mother Naurie Del Valle, getting volunteer help filing her taxes opened up a key door for her small daycare business. Two years ago, Del Valle said Friday, she purchased a house and was able to expand the backyard using money she gained from a refund facilitated through the Volunteer Income Tax Assistance, or VITA, program. That in turn gave her clearance to open her daycare. "Not opening a daycare means no income for my family. I have three girls, and I'm a single mom," Del Valle said during a call hosted by the Massachusetts Association for Community Action (MASSCAP) to kick off the annual tax season.