Recalculation of a mortgage payment schedule using the remaining balance, rate, and term.
Reamortization is the recalculation of a mortgage payment schedule using the remaining balance, interest rate, and remaining term.
Reamortization matters because a mortgage’s required payment may need to be recalculated after certain events. A large principal reduction, recast, modification, or rate adjustment can change how the remaining balance is spread across the remaining term.
It also matters because borrowers often assume any extra principal payment automatically lowers the required monthly payment. In many loans, extra principal lowers the balance, but the scheduled payment changes only if the loan is formally reamortized or recast.
Borrowers encounter reamortization after closing, usually in servicing rather than at the original application stage.
The term becomes practical when discussing a mortgage recast, loan modification, payment recalculation, or major principal reduction.
| Term | What changes |
|---|---|
| Amortization | Original balance-reduction pattern over time |
| Reamortization | Updated payment schedule based on current loan inputs |
| Mortgage Recast | A servicing action that may use reamortization after principal reduction |
| Refinance | Replaces the existing mortgage with a new loan |
A borrower makes a large principal reduction and the servicer approves a recast. The remaining balance is then spread over the remaining term to calculate a lower required payment. That recalculation is reamortization.
Reamortization differs from Amortization because amortization is the original or general balance-paydown process, while reamortization is a later recalculation of that process.
It differs from Mortgage Recast because recast is the servicing event, while reamortization is the math behind the updated payment schedule.
It also differs from Refinance because refinance replaces the loan; reamortization recalculates payment behavior inside an existing loan or changed loan setup.