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How should I be contributing to my 401(k), traditional or Roth?
The Finance Buff discusses why the Roth 401k is often disadvantaged compared to a Traditional 401k in the article The Case Against the Roth 401k, including the following reasons (paraphrased): Contributions to the 401k come from the "top" of your highest tax bracket rate but withdrawals fill in from the "bottom".  For example, suppose you are in the 28% tax bracket.  Every marginal dollar you contribute to the Traditional 401k reduces your tax burden by .28 cents.  However, when withdrawing, the first $10,150 of income is tax-free (from standard deduction and exemption, 2014 numbers; $20,300 for married couples, joint filing).  The next dollars are at the 10% tax bracket, and so on.  This is an advantage for the Traditional 401k only if you earn less when withdrawing than you did when contributing, a reasonable assumption. Avoid High State Income Tax. There are many states that have low or no state income tax.  If you live in a state with a high income tax, paying tax now through the Roth 401k reduces the benefit of moving to a state with a lower income tax rate. Avoid triggering credit phaseouts. Many tax credits (e.g. student loan interest, child tax credit, Hope credit, Roth IRA eligibility, etc.) begin phasing out as your income increases.  Contributing to the Traditional 401k can help you realize more of those credits when you starting running up against those limits. As described in the article, if these items don't apply, contributing to the Roth 401k can be a valuable component of tax diversification.