Mortgage Recast Calculator
Use this mortgage recast calculator to estimate a new monthly payment after a lump sum principal payment and loan recast.
Use the calculator near the top of the page, review the summary table, then change one input at a time to compare realistic scenarios before making a final decision.
What is the Mortgage Recast Calculator?
A mortgage recast calculator estimates how a large principal reduction may lower the monthly payment while the original loan term often stays in place.
It is designed to turn common planning inputs into a clear estimate, so users can understand the numbers before comparing options, speaking with a professional, or moving forward.
What mortgage recasting means
Mortgage recasting means making a lump sum principal payment and asking the lender to recalculate the monthly payment over the remaining loan term. The interest rate and payoff date usually stay the same, but the payment may drop because the balance is lower.
This mortgage recast calculator helps users estimate the new payment after a principal reduction and compare recasting with refinancing or extra payments.
How to use the Mortgage Recast Calculator
Start with realistic numbers. If you do not know an exact value yet, use a careful estimate and update it later when you have a quote, statement, pay stub, tax document, or lender figure.
- Enter current balance, rate, remaining term, and lump sum payment.
- Review the estimated new monthly payment after recast.
- Compare old payment with recast payment.
- Check lender recast rules and fees before relying on the result.
Example
For example, a user can open the Mortgage Recast Calculator, enter a realistic loan balance and rate, then compare the result with another payment scenario. This makes it easier to see whether the option fits the monthly budget before moving forward.
Mortgage recast formula
- Recast balance = current balance - lump sum principal payment
- r = monthly interest rate
- n = remaining monthly payments
Mortgage recasting is more common in the US than the UK. Some lenders do not offer it, and rules can vary by loan type.
Why use this calculator?
This tool improves planning because it gives users a quick estimate and a clearer way to compare options without doing manual calculations.
- Shows possible payment reduction after a lump sum.
- Useful for homeowners who want lower payments without refinancing.
- Helps compare recast and payoff strategies.
Best for
- Users who want a quick estimate before making a decision.
- People comparing two or more scenarios.
- Anyone who wants a clearer result table instead of rough mental math.
Pros and things to check
Potential benefits
- Can lower monthly payment without replacing the loan.
- May be cheaper than refinancing if the lender fee is low.
- Useful after a bonus, inheritance, home sale, or savings event.
Important checks
- Not every lender or loan type allows recasting, and a minimum lump sum may apply.
- Results are estimates and can change after lender review, credit checks, taxes, insurance, fees, or local rules.
- Users should confirm the final payment, eligibility, and terms with a lender, broker, tax adviser, or qualified professional.
Mortgage Recast Calculator quick guide
Use this table to understand the main purpose of the calculator and what to check before relying on the result.
| Topic | Details |
| Main use | A mortgage recast calculator estimates how a large principal reduction may lower the monthly payment while the original loan term often stays in place. |
| Primary keyword | mortgage recast calculator |
| Best next step | Compare the result with at least one realistic alternative scenario. |
| Important check | Confirm final numbers with a qualified source before making a major financial decision. |
Country and lender note
Mortgage rules and costs vary by market. This calculator is most useful for users comparing home loan scenarios in the United States and the United Kingdom, and it can also support planning in Canada, Australia, and similar markets. Taxes, insurance, PMI, stamp duty, escrow, lender fees, affordability checks, and repayment rules can differ by country and lender, so treat the result as an estimate and confirm final numbers locally.
FAQs
What is the Mortgage Recast Calculator?
It estimates the new mortgage payment after a lump sum principal reduction and recast.
How accurate is the Mortgage Recast Calculator?
The result is an estimate based on the values you enter. Real results can change because of rates, fees, taxes, provider rules, lender rules, payroll rules, or personal details.
Who should use this calculator?
Homeowners considering a recast after savings, sale proceeds, or bonus money can use it.
Can this calculator replace professional advice?
No. Use it for planning and comparison, then confirm final decisions with a lender, tax professional, payroll specialist, adviser, or other qualified professional where needed.