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Missing opportunity cost of mortgage prepayment
You seem to really have your financial act together.  Your combination of assets, and ongoing savings makes you the ideal candidate for paying it off. One way to look at it is that your mortgage offers you a place to 'invest' at a fixed 2-7/8% rate. "I'd really like to not have a house payment" is all I need to hear.  The flip side is the lecture that talks about long term market returns, the fact that the combination of your deductible mortgage, but 15% cap gain rate means you need 2.5% return to break even, and odds are pretty high that will occur over the next 15 years. "pretty high" does not equal "guaranteed". And I won't debate the value of sleeping soundly vs an excess 5-8% return on this money that you'd maybe achieve.  You haven't missed anything. In fact, though I advocate saving first, you are already doing that. This is above and beyond. Good work.