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Is 401k as good as it sounds given the way it is taxed?
There are 3 options (option 2 may not be available to you) When you invest 18,000 in a Traditional 401k, you don't pay taxes on the 18k the year you invest, but you pay taxes as you withdraw.  There's a Required Minimum Distribution required after age 70.  If your income is low enough, you won't pay taxes on your withdrawals.  Otherwise, you pay as if it is income.  However, you don't pay payroll tax (Social Security / Medicare) on the withdrawals.  You pay no tax until you withdraw. When you invest 18,000 in a Roth 401k, you pay income tax on the 18,000 in the year it's invested, but you pay nothing after that. When you invest 18,000 in a taxable investment account, you pay income tax on that 18,000 in the year it's invested, you pay tax on dividends (even if they're re-invested), and then you pay capital gains tax when you withdraw. But remember, tax rules and tax rates are only good so long as Congress doesn't change the applicable laws.