"net contributions are $2 less than $8300 but there is no way to make TurboTax do that."
Good point. TurboTax behaves differently than I originally thought.
Given the way TurboTax works, I think that simplest would be to just say that you had $413 returned and not try to do any other workaround. The difference between $413 and $415 is de minimis.
