If your only income for 2014 was a 401(k) withdrawal, you are still required to file a tax return and report it. All withdrawals from qualified plans are subject to regular income tax, and if you were under age 55, you will also be subject to a 10% early withdrawal penalty. If you had money withheld from the withdrawal and it was not enough to cover the tax, you will owe more; but if it was more than the tax you would get a refund.
To file a 2014 tax return using Turbotax you will need to purchase Turbotax for 2014 and install it on your own computer. See the bottom of the Turbotax main page and look for "past year products."
