Recasting Calculator

Determine your new monthly mortgage payment and potential savings after making a lump-sum principal payment.

Recasting Impact Summary

Metric	Original Path	After Recasting
Monthly Payment (P+I)	$0.00	$0.00
Loan Balance	$0.00	$0.00
Total Interest Paid (Remaining)	$0.00	$0.00
Total Payments (Remaining)	$0.00	$0.00

This table shows how key mortgage figures change if you decide to recast your loan.

What is a Recasting Calculator?

A recasting calculator is a financial tool designed to show you the benefits of mortgage recasting. Recasting, sometimes called re-amortization, is a process where your lender re-calculates your monthly mortgage payment after you make a significant lump-sum payment toward your principal balance. Unlike refinancing, your interest rate and the end date of your loan term remain the same. The primary goal of recasting is to lower your monthly payments, thereby improving your monthly cash flow. This **recasting calculator** helps you precisely quantify that new payment and understand the long-term interest savings.

This tool is ideal for homeowners who have come into a sum of money (e.g., from a bonus, inheritance, or sale of another asset) and want to reduce their monthly financial obligations without going through the complex and costly process of a full mortgage refinance. Our mortgage recast vs refinance guide provides a deeper comparison.

The Recasting Calculator Formula and Explanation

The core of the recasting calculation is the standard amortization formula, which is applied to the new, lower principal balance. The formula is:

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]

The **recasting calculator** uses this to determine your new monthly payment after the lump-sum contribution.

Variable	Meaning	Unit	Typical Range
M	New Monthly Payment	Currency ($)	$500 – $5,000+
P	New Principal Balance (Current Balance – Lump Sum)	Currency ($)	$50,000 – $1,000,000+
i	Monthly Interest Rate (Annual Rate / 12)	Decimal	0.002 – 0.007
n	Remaining Number of Payments (Remaining Years * 12)	Months	12 – 360

Practical Examples

Example 1: Significant Lump Sum

• Inputs: Current Balance: $300,000, Lump-Sum Payment: $75,000, Interest Rate: 7.0%, Remaining Term: 25 years.
• Results: The original payment would be approximately $2,120/month. After recasting, the new balance is $225,000, and the new monthly payment drops to about $1,590/month. This is a monthly saving of $530 and results in over $47,000 in total interest saved over the remaining life of the loan.

Example 2: A Modest Recast

• Inputs: Current Balance: $450,000, Lump-Sum Payment: $30,000, Interest Rate: 5.5%, Remaining Term: 20 years.
• Results: The original payment is about $3,130/month. By recasting, the new balance becomes $420,000, and the monthly payment is reduced to approximately $2,920/month. While the monthly saving of $210 is smaller, it still leads to significant cash flow improvement and total interest savings of over $20,000. You can model similar scenarios with our lump sum mortgage payment calculator.

How to Use This Recasting Calculator

Using our recasting calculator is a simple, four-step process to see your potential savings:

1. Enter Current Loan Balance: Input the exact principal balance you currently owe. You can find this on your most recent mortgage statement.
2. Enter Lump-Sum Payment: Input the amount of money you plan to pay down on the principal. Lenders often have a minimum amount required for recasting (e.g., $5,000 or $10,000).
3. Provide Loan Details: Enter your current annual interest rate and the number of years remaining on your loan’s original term.
4. Calculate and Analyze: Click “Calculate New Payment.” The calculator will instantly display your new, lower monthly payment, your monthly savings, the new loan balance, and the total interest you’ll save. The table and chart provide a deeper view of the financial impact. You can also explore our amortization schedule calculator to see a full payment breakdown.

Key Factors That Affect Mortgage Recasting

Before proceeding with a recast, consider these important factors. They determine whether recasting is the right choice for your financial situation.

• Lender Policies: Not all lenders offer mortgage recasting, and those that do have different rules. Government-backed loans (FHA, VA) are typically not eligible. Conventional loans are the most common candidates.
• Recasting Fees: While much cheaper than refinancing, there is usually a small administrative fee for recasting, often ranging from $150 to $300.
• Minimum Lump Sum: Lenders require a minimum principal reduction to perform a recast. This can be a fixed amount (e.g., $10,000) or a percentage of the loan balance.
• Interest Rate Environment: Recasting keeps your current interest rate. If market rates are significantly lower than your current rate, refinancing might be a better option to both lower your payment and save more on interest. Compare options with a recast vs. refinance analysis.
• Financial Goals: If your primary goal is to lower monthly payments and improve cash flow, recasting is excellent. If your goal is to pay off the loan faster, simply making extra payments without recasting might be better. See how that works with an extra mortgage payment calculator.
• Loan Seasoning: Some lenders require your loan to be “seasoned,” meaning you’ve made consistent payments for a certain period (e.g., 12 months) before they will allow a recast.

Frequently Asked Questions (FAQ)

1. Is recasting the same as refinancing?

No. Recasting re-amortizes your loan over the remaining term with a lower balance, keeping your rate the same. Refinancing gives you an entirely new loan, with a new rate, term, and closing costs.

2. Does recasting hurt my credit score?

No, the recasting process itself does not involve a credit check and is not reported to credit bureaus, so it has no impact on your credit score.

3. Why would I recast instead of just making an extra payment?

Making an extra payment shortens your loan term and saves you interest, but it does not lower your required monthly payment. Recasting provides the benefit of a lower monthly obligation, which increases your financial flexibility.

4. What is the main benefit of using a recasting calculator?

A recasting calculator provides immediate, clear results on how a lump-sum payment will affect your monthly budget. It helps you make an informed decision by quantifying the principal reduction benefits before you even contact your lender.

5. Can I recast my mortgage more than once?

This depends entirely on your lender’s policy. Some may allow it, while others may limit the number of times you can recast a loan.

6. Does the recasting calculator account for lender fees?

This calculator focuses on the change in your loan balance and payments. It does not include the small one-time fee your lender may charge for the service.

7. How long does the recasting process take?

It’s typically a fast process, often taking just a few weeks from your request to when the new payment schedule takes effect.

8. Is it better to invest the lump sum or use it to recast my mortgage?

This is a classic “return on investment” question. If you can confidently earn a higher after-tax return by investing the money than the interest rate on your mortgage, investing may be better. Recasting provides a guaranteed, risk-free return equal to your mortgage interest rate.