Quick answer
A mortgage recast generally keeps the existing loan, rate and remaining term but recalculates the required principal-and-interest payment after a substantial principal reduction. A refinance replaces the loan and can change the rate, term or loan type, but it usually requires underwriting and closing costs. Availability and rules depend on the loan and servicer.
The core difference
A recast and a refinance can both lower a required monthly payment, but they use different mechanisms. With a recast, a borrower makes or has already made a substantial principal payment and asks the servicer to re-amortize the lower balance over the loan's remaining schedule. With a refinance, a new mortgage pays off and replaces the old one.
That difference affects nearly every comparison: rate, term, qualification, closing costs and how quickly the change can be completed.
Recast vs. refinance at a glance
| Question | Mortgage recast | Refinance |
|---|---|---|
| Does the original loan remain? | Usually yes | No, it is replaced |
| Can the interest rate change? | Generally no | Yes, based on the new offer |
| Can the term change? | Usually the remaining maturity stays | A new term may be selected |
| Is a large principal payment typical? | Often required | Not necessarily |
| Are closing costs typical? | Often a smaller servicing fee | Loan and settlement costs generally apply |
| Is every loan eligible? | No | No; underwriting and program rules apply |
How a mortgage recast works
Fannie Mae's servicing guidance describes re-amortization after a substantial principal curtailment as a way to reduce the contractual monthly mortgage payment. The servicer follows investor, loan-document and applicable-law requirements. That does not mean every Fannie Mae loan—or every other loan—automatically qualifies.
- Ask the servicer whether the specific loan is eligible.
- Confirm the minimum principal payment, fee and timing.
- Ask when the lower contractual payment will begin.
- Request the new amortization schedule and written confirmation.
- Keep proof that the principal payment was applied correctly.
A recast normally does not turn a high interest rate into a lower one. It reduces the balance used to calculate the remaining scheduled payment.
How refinancing differs
Freddie Mac explains that refinancing replaces the current mortgage with a new loan carrying a new rate, term and payment. The process may involve credit review, income documentation, an appraisal or valuation, a new Loan Estimate and closing costs.
Refinancing may fit when the goal is to change the interest rate, shorten or extend the term, switch loan type, remove a borrower where permitted, or access equity. Each goal needs its own comparison.
Compare more than the monthly payment
- Cash used: a recast can move a large amount of liquid savings into home equity.
- Rate effect: a refinance can improve or worsen the rate depending on the offer.
- Term effect: restarting with a longer term may lower the payment while increasing total interest.
- Break-even: closing costs need time to recover through genuine savings.
- Escrow and insurance: a lower principal-and-interest payment does not freeze taxes, insurance or HOA costs.
Questions for the servicer or lender
For a recast
Is the loan eligible? What principal reduction and fee are required? Does the interest rate or maturity change? When does the new payment become effective?
For a refinance
What are the rate, APR, points, lender credits, cash to close and total loan costs? How does the new maturity compare with the remaining term?
A practical decision sequence
- Write down the goal: lower minimum payment, lower rate, shorter term or cash access.
- Preserve an emergency reserve before committing a lump sum.
- Obtain written recast requirements from the servicer.
- Request multiple refinance Loan Estimates for the same loan scenario.
- Compare payment, cash used, break-even date and total interest under a realistic ownership horizon.
Use the refinance break-even guide, extra-payment guide and amortization explainer to build the comparison.
Build a written comparison worksheet
Ask for the current unpaid principal balance, interest rate, remaining months and principal-and-interest payment. For the recast column, add the proposed principal reduction, fee, new required payment and effective date. For the refinance column, add the new loan amount, rate, APR, term, total loan costs and cash to close.
Then calculate the cash remaining after each option. A lower payment is less useful if it leaves the household without funds for insurance deductibles, repairs or income disruption. Also compare balances at the same future date rather than comparing only the first monthly payment.
Check how each option affects flexibility
A recast may preserve an existing low rate but commits cash to home equity. A refinance may preserve cash but introduce a new rate, term and closing-cost recovery period. If the household expects to move, sell or refinance again soon, include that date in the comparison. Save every assumption so the worksheet can be updated when a written offer changes.
Frequently asked questions
Does an extra principal payment automatically lower my required payment?
Not usually. It reduces the balance and may shorten payoff timing, but a lower required payment generally requires an approved recast or a new loan.
Can a recast remove mortgage insurance?
Do not assume so. Mortgage-insurance cancellation has separate federal, investor, valuation and servicer rules.
Which option is cheaper?
It depends on rate, fees, principal payment, remaining term and how long the borrower keeps the loan. Compare documented offers rather than labels.