On a pure dollars-and-cents basis, the difference is that...
On a pure dollars-and-cents basis, the difference is that with the traditional 401(k) you get the tax break now, while with the Roth 401(k) the tax break comes later.
On a pure dollars-and-cents basis, the difference is that with the traditional 401(k) you get the tax break now, while with the Roth 401(k) the tax break comes later.