Paying regular additional payments on your loan principal will yield enormous returns. You can pay against principal in various ways. Making 1 extra full payment one time every year is likely the easiest to arrange. If you can't pay an extra whole payment all at once, you can split that large amount into 12 smaller payments and write a check for that additional amount monthly. Finally, you can pay a half payment every two weeks. These options differ slightly in reducing the final payback amount and shortening payback length, but they will all significantly shorten the duration of your mortgage and lower your total interest paid.
It may not be possible for you to pay more every month or even every year. Remember that almost all mortgages will permit you to make additional payments to your principal at any point during repayment. You can benefit from this provision to pay extra on your mortgage principal when you come into extra money. If, for example, you receive a very large gift or tax refund four years into your mortgage, paying several thousand dollars into your home's principal will significantly shorten the period of your loan and save a huge amount on mortgage interest paid over the life of the mortgage loan. For most loans, even a relatively small amount, paid early enough in the mortgage, could offer big savings in interest and in the duration of the loan.
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