No. of Recommendations: 0
Depending on your mortgage rate, I would prioritize maxing out all possible tax-advantaged accounts (401k, IRA, HSA, 529) before paying off the mortgage.
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Also remember, when paying off the mtg, you also are tossing the deduction of interest, so that 4% is actually lower
ANother aspect, as you work through your calculations, is remember you are going to lose a nice chunk of that 4% withdrawal to taxes, so 4% withdrawal will feel a lot more like a 3% spending amt.
You may want to consider a little money going into Roth's as well. You can actually 'store' a little more there because you can take out what you put in without a penalty, so you can be a little safer with 'over saving', for me I did this late as I wanted a little more flexibility if I wanted to do a big draw in any year without jumping a tax bracket. Plus I felt biting the bullet on some of the taxes while working was worth the flexibility.
Good luck!