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Paying over the minimum mortgage payment
take a look at this graph here: http://mortgagevista.com/#m=1&a=40000&b=4&c=30y&B&oa&ob&oc&od It shows how much it costs to borrow $40k for 30 years. You did not post your mortgage rate or loan term, so I used 4% over 30 years (you can easily update this with your actual details). While this does not show the costs of your total mortgage, it does help you get an idea of just how much the 40k$ in question is costing you in interest. If you hover over the month one year from now you will see that you will have paid around $1587 in interest over the course of the year. If you were to put the full 40k$ toward your mortgage right now, you would avoid having to pay this interest over the next year.  The next question I think you would have to ask yourself is if there is anything else you could do with that money that is worth more than the $1587 to you.  Is it worth $1587 to keep those funds liquid/available in case you need to use them for something else? Could you find other investments you feel comfortable with that could earn you more than $1587?  Is it worth the hassle/risk of investing the funds somewhere else with a better return? If you can't come up with anything better to do with the money then yes, you should probably use the funds (or at least part of them) towards the mortgage.