I did e-file with Tax Act in 2018 but not with a QOF deferral. I was actually using 2018 Tax Act to analyze the benefit of a 2019 QOF deferral prior to the release of the 2019 version. It handled it as expected, i.e. Box F, with Code Z. It transferred to forms as the form 8949 instructions state. I see no reason that it would not file electronically.
For several years, I have also used TurboTax (premier or higher) in parallel to provide a double check. I've had some complicated tax situations that justified the cost (short of a CPA). As part of my analysis of a potential QOF deferral in 2019, I also tried to run the scenario in 2018 TurboTax. It provided no way to do it as I had in Tax Act. That's how I ended up here. I found it unbelievable that Turbo Tax couldn't do it when Tax Act did. As it turns out TT didn't do it in 2018 and won't provide it in 2019 either (seemingly).
