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save or pay extra mortgage?

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  • #31
    Re: save or pay extra mortgage?

    Basically I'm being an advocate for compound interest. I believe it is better to save money that compounds rather than paying off a simple-interest loan.

    Let's say you have a 94,000 loan fixed at 6.75% and make $500 principal payments monthly. You'll pay off the loan in 7.5 years and have saved $30,000 in interest.

    Now Let's say instead of paying $500 toward your mortgage, you invested it in a safe index fund that earns a modest 9.5% return annually. If you made the $500 deposits every month for 7.5 years, you would have $65,782 in that mutual fund where as the loan balance after 7.5 years with no prepayments would be about $58,000. So you could pay off that loan and still have $7,000 in cash...

    OR

    You could continue to pay on the loan for the 15 year term and keep putting away that extra $500/mo into the mutual fund. After 15 years you would have paid about 55,000 in interest. However, your mutual fund would now be worth $199,541.61. Subtract the $30,000 of interest you could have saved by making prepayments, and you're coming out about $170,000 ahead.

    Now, 15 years later, loan #2 is gone and you have $199,541 in your mutual fund. Let's say you just let that simmer for a while and keep making the $500/mo investment into it (now you have that $850 extra for spending because loan #2 is paid off) Let's let it sit for 15 more years until Loan #1 is paid off. After 15 more years, your mutual fund will be worth $1,024,565.02.

    What you're basically doing is sacrificing interest early to take advantage of the "time" element of compounding interest...

    Hope that makes sense...

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    • #32
      Re: save or pay extra mortgage?

      Originally posted by lucasrd
      a safe index fund that earns a modest 9.5% return annually.
      Ah, there's the rub. There is no guarantee that an index fund will give you a positive return, much less a return of ~10%.

      I agree with you, it's usually worth the risk, but some people prefer the guaranteed return you get from paying down the mortgage.

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      • #33
        Re: save or pay extra mortgage?

        That is what I am thinking, there is no guarantee that you will gain that almost 10%

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        • #34
          Re: save or pay extra mortgage?

          Right...I'd say it's worth the risk...though

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          • #35
            Re: save or pay extra mortgage?

            I am a day late and a dollar short as usual. Sweepsplayer is correct though.
            Paying off the larger loan is the way to go. The buildup in interest negates the flip effect of payments that had been going to the smaller loan.

            Sweepsplayer speaks the truth and as usual is quite accurate!

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