If you have already e-filed a tax return you cannot file again. If you filed a tax return with a mistake or left out information, then you can amend it once it has been fully processed. However, understand that the tax preparation software programs all have to conform with the new tax laws and were approved by the IRS. If you got dramatically different results on one of the programs that means something YOU entered was different.
If you used TurboTax to e-file and need to amend, we can help. If you filed with the other program, use that program to amend your return if necessary.