Recast vs. extra principal payment
Both start the same way — a lump sum toward principal. What you do next is what differs, and it changes the math completely.
The one-line difference
Recast: lower your monthly payment, keep the same payoff date.
Extra principal (no recast): keep your monthly payment, pay off sooner.
Because the second option keeps more money flowing at the loan every month, it always retires the balance faster and costs less total interest. The recast trades that interest savings for monthly breathing room. Neither is "wrong" — they optimize for different things.
Pick by your goal
| Your goal | Better choice |
|---|---|
| Lower required monthly payment | Recast |
| Pay the least total interest | Extra principal, no recast |
| Be debt-free sooner | Extra principal, no recast |
| Flexibility if income drops | Recast (lower obligation) |
| Avoid any fee | Extra principal (recasts charge a fee) |
A note on discipline
The extra-principal route only wins if you actually keep paying the old, higher amount. A recast locks in the benefit as a lower required payment, which some people prefer precisely because it doesn't rely on willpower.