@a219112m generally any balance due on an individual income tax return (federal or state) is payable on or before 4/15 of year following the tax year. if you need your state refund to pay the federal balance due (or vice versa) in order to avoid penalties for late payment you have to e-file early enough so your refund arrives in time. The date Turbotax gives you for a refund is an estimate and some refunds arrive much later so you should file as early as possible
