Doubling up is a solid idea...essentially you itemize your taxes every other year. For what it's worth, given your age, you could probably stand to be a bit more aggressive with your investments. I'm not a financial planner, but given your situation (which is pretty similar to mine) I'd prioritize your extra $ like this: 1) Accumulate 3-6 months of "cash" (CDs, etc.) for emergencies 2) Invest the max up to the employer match 3) Invest the 5k max in aggressive stocks/mutual funds within a Roth IRA 4) If there's anything left, either contribute more to the pre-tax 401k or make the early payments on the mortgage. Paying the mortgage off early isn't a terrible idea, especially if it's worth it to you in peace of mind. Mathematically, though, it's not going to be your best investment in the long term especially compared to a tax-advantaged account. Just my $.02.