If you simply want to keep asking why the Program is doing this, we cannot help with a question that has no real substance to it.

If you want to ask about an entry or field that seems different, unfamiliar, or is the source of something that likely makes the difference, we can help.

The scenario that a Backdoor Roth is the same as a "post-tax contribuiton" and an immediate "complete rollover" means there still are qualification details to confirm, which we are trying to do.

"My question is why the software wont let me make it non taxable"

Because you didn't enter the 1099-R correctly, or didn't complete the 8606 as required, or something else makes this seem taxable to the program and we are trying to help you identify it, and this is something we cannot see, so we need details or we ask for details, to review something you might have overlooked or forgotten.