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Can extra mortgage payments be made to lower the monthly payment amount?
Some types of loans allow for reamortization (recasting) - which does exactly what you're talking about (making a big payment and then refiguring the monthly amount rather than the overall lifespan), without requiring any kind of a fee that refinancing does. Not every, or even most, mortgages, allow for recasting. And most that do offer recasting, may limit the recasting to a once-a-loan type of thing. So check beforehand, and make those big payments before you do any recasting. (Most banks and mortgage servicing companies may not advertise or even speak about recasting options unless you specifically ask your loan officer.)