Turbotax is a software that lets you conveniently file a federal tax return without any disruption. Sometimes after filing a tax return, users recognize some necessary changes that need to be made to receive an accurate amount of refund. For example, you missed a tax credit that you are liable for or new information/revelations arise after you file a return. Also, if you missed an IRS 1099 form that is used to check the income you have acquired during the year, you will need to edit the tax returns. However, you cannot make changes to the originally filed tax return. In such scenarios, you have to file an amended tax return with all the necessary documents.
More info : Federal Tax Return