Killing TurboTax
My wife is a tax accountant. From a software perspective taxes are a nightmare. I made a service BasisCalc (https://basiscalculator.com/) to automate just one little part of the big multi-dimensional elephant that is the tax code and it was terrifically hard to implement. I can't imagine doing the entire tax stack. There's local, state, federal, and international. The code changes all the time. The dates change all the time. There are real substantial penalties for being late. There are so many data sources to integrate. She spends thousands a year and many hours of her time simply on tax code updates. She has serious legal liability for her work. So will your software. I would pick an easier target, like solving world hunger or world peace. Taxes will be simpler when politicians want them to be simpler and there's no profit in that.