Do I need to be keeping track of Roth vs traditional 401k contributions? Over time I have contributed some money to traditional 401k as well as roth 401k. Currently I contribute a little bit of my salary to both of them. Do I need to be keeping track of how much money goes into each one, or is this being keeps kept track of by the firm that manages the 401k? I just want to make sure that I'm not going to end up paying taxes on the Roth contributions in the future.