The IRS has partnered with several large firms to offer free electronic filing for a limited number of taxpayers (based on income, in some cases). How will you know whether you qualify? You may have to go all the way through the online tax preparation process before they tell you if you’ll have to pay or not. Most of the firms offering free federal e-filing do charge for preparation of a state tax return.
For returns prepared by Nvisionit, there is no extra charge for electronic filing — in fact we recommend it.