This my first time using Turbotax. I am filing back taxes for 2015 to 2018. Since Turbotax no longer supports online filing for 2015, I have purchased a desktop version. My question is how do I actually file my 2015 taxes? Does the IRS even allow online filing of the 2015 taxes? If not, would I print and mail my 2015 tax returns. Comments and suggestions appreciated.
