Perhaps I misunderstood your concern. I was trying to say that you must enter the Roth 401(k) contribution in the Roth 401(k) Elective Deferrals box on the Individual and Roth 401(k) Plans page in TurboTax, not in the Individual 401(k) Elective Deferrals box. The Roth 401(k) is part of your individual 401(k), technically it's the Designated Roth Account in your individual 401(k), but people say Roth 401(k) for short.
