I think we've fairly well established that the complexity of the code isn't the problem. The IRS knows what you owe and could just tell you if they wanted to.
Having citizens exposed directly to the mechanics of it during the filing process is a policy choice and the way to fix that is to change the policy, not try to reinvent the tax code from first principles.
This is a complex set of laws yes but it is also detailed multi-generational documentation of all the shit people have tried to pull. You don't just throw that out because it has grown complex. Like all necessary complexity, you isolate and manage it, not spray it all over the end user.
Having citizens exposed directly to the mechanics of it during the filing process is a policy choice and the way to fix that is to change the policy, not try to reinvent the tax code from first principles.
This is a complex set of laws yes but it is also detailed multi-generational documentation of all the shit people have tried to pull. You don't just throw that out because it has grown complex. Like all necessary complexity, you isolate and manage it, not spray it all over the end user.