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Mortgage recast calculator

Compare keeping your current mortgage payment with making a lump-sum principal payment and recasting the loan for a lower required payment.

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Compare current payment vs recast

Enter principal and interest only for the current payment. Taxes, insurance, HOA dues, PMI, escrow changes, opportunity cost, and tax effects are not modeled.

New recast payment
Monthly reduction
Fee break-even
Break-even date
Interest saved at horizon
Full-term interest saved
Balance difference at horizon
Cash outlay at horizon
PathMonthly P&IUpfront cashInterest at horizonRemaining balanceTotal cash at horizonPayoff timing

Methodology notes

Payment math

The current payment is either your input or the fixed-rate payment implied by current balance, rate, and remaining term. The recast payment uses the balance after the lump-sum principal payment over the same remaining term.

Break-even

Fee break-even divides the servicer recast fee by the monthly payment reduction. The principal lump sum is treated as equity-building cash, not a fee.

Cash and balance

Total cash outlay includes payments made through the holding period plus the lump sum and recast fee. Remaining balance is shown separately because lower debt also changes your equity.

Results are estimates for educational purposes only and are not financial advice. Confirm recast eligibility, fees, minimum curtailment, and investor rules with your servicer. See full disclosure.

Mortgage recast FAQ

Is a recast the same as refinancing?

No. A recast keeps the same loan and rate, while refinancing replaces the loan and can change rate, term, and closing costs.

Does recasting save interest?

The lump-sum principal payment usually saves interest. Recasting by itself mainly lowers the required payment; keeping the old payment after the lump sum typically saves more interest.

Which loans allow recasting?

Availability depends on the servicer and investor. Many conventional loans allow it, while FHA, VA, and USDA loans often do not.

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