In an ideal world, if tax brackets and income at the time of contribution and withdrawal stay the same, investing in Roth 401(k) vs. traditional 401(k) yields identical results.
With a Roth 401(k), any matching contributions by your employer are considered pre-tax money. And you pay taxes on the employer contribution and growth.
If tax brackets and income at the time of contribution and withdrawal stay the same, investing in Roth 401(k) vs. traditional 401(k) yields identical results.