The 3115 would be used only if you are past the 3-year statute of limitations. For 2016 you *might* be past that already. If so, then the 3115 is needed. Even though the 3115 is included in the TTX program understand that it is "NOT" simple by any stretch of the imagination and requires professional help. Try it yourself and screw it up, and you just compound your issues with the IRS making the cost of professional help seem like a pittance in comparison.
