For many years I did my taxes by hand. Checked them with Turbotax when you could buy a copy that didnt require internet. Then for many years, the company required us to use their CPA. Since I retired, I used the IRS software and left money on the table. I cant use TurboTax as the farm house doesnt have internet. So it was mano to mano with the tax code this year. Built my own software on Excel. Used the IRS pdf forms. Very happy with the results and I am fully conversant on the code. My software is ready for next year, but 2019 had a lot of changes from 2018. We will see what 2020 brings. Ps, read Sch 2 and 3 carefully for hidden taxes. How about you?