When extra mortgage payments matter most
Extra principal can have its biggest impact when the remaining balance is high and many years of interest are still ahead.
That is why payoff examples can be useful even before deciding whether to recast, refinance, or simply keep the existing loan.
How the extra payment and term shape this example
Since the extra amount here is on the smaller side, expect the payoff-date shift to be measured in months rather than years.
A 30-year baseline carries the most total interest of the common terms, so the same extra payment tends to save more in dollar terms here than on a shorter original term.