Compare Roth 401k vs Traditional 401k after-tax retirement savings.
Traditional 401k: Contributions are tax-deductible now, withdrawals are taxed as ordinary income. Best if your current tax rate is higher than retirement rate.
Roth 401k: Contributions are made with after-tax dollars, withdrawals are tax-free. Best if your retirement tax rate will be higher than current rate.
Key Question: Do you think your tax rate will be higher or lower in retirement?