Mortgage Recast Calculator
Estimate your new monthly payment after making a lump-sum principal payment.
Calculate Your Recast
Payment Comparison
Amortization Snapshot
| Metric | Before Recast | After Recast |
|---|---|---|
| Monthly P&I Payment | $0.00 | $0.00 |
| New Principal Balance | – | $0.00 |
| Total Interest Paid | $0.00 | $0.00 |
| Loan Payoff Date | Remains the same | |
What is a Mortgage Recast Calculator?
A mortgage recast calculator is a financial tool designed to help homeowners understand the impact of making a large, lump-sum payment towards their mortgage principal. Unlike refinancing, a mortgage recast (or re-amortization) doesn’t change your interest rate or the loan’s end date. Instead, your lender recalculates your monthly payments based on the new, lower balance over the remaining term. This results in a lower required monthly payment, increasing your monthly cash flow.
This calculator is for homeowners who have come into a sum of money (e.g., from an inheritance, bonus, or sale of another asset) and want to reduce their mortgage burden without the cost and complexity of a full refinance. It is especially useful if you already have a favorable interest rate that you want to keep. Many people explore principal reduction options to manage their finances better.
Mortgage Recast Formula and Explanation
The calculation process involves two main steps: determining the original monthly payment and then calculating the new payment after the principal reduction. The standard formula for monthly mortgage payment (M) is:
M = P [r(1+r)^n] / [(1+r)^n - 1]
First, we calculate the new principal balance. Then, we apply the mortgage formula using this new balance while keeping the interest rate and remaining term constant.
Variables Table:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| P | Principal Loan Balance | Currency ($) | $50,000 – $2,000,000+ |
| r | Monthly Interest Rate | Decimal | Annual Rate / 1200 |
| n | Number of Payments | Months | 1 – 360 |
| L | Lump-Sum Payment | Currency ($) | $10,000+ |
Practical Examples
Example 1: Significant Inheritance
A homeowner has a remaining mortgage balance of $350,000 at a 4% interest rate with 25 years left. They receive an inheritance and decide to make a $75,000 lump-sum payment.
- Inputs: Current Balance: $350,000, Rate: 4%, Remaining Term: 25 years, Lump Sum: $75,000.
- Results: The original payment of $1,848/month is reduced to a new payment of $1,452/month, freeing up nearly $400 monthly. The total interest saved over the life of the loan would be substantial. This is a common scenario when comparing a recasting vs refinancing decision.
Example 2: Selling a Previous Home
Someone buys a new home for $600,000 before selling their old one. Their loan has a 5.5% interest rate over 30 years. After six months, they sell their old house and use $150,000 of the proceeds for a recast.
- Inputs: Current Balance: ~$595,000, Rate: 5.5%, Remaining Term: 29.5 years, Lump Sum: $150,000.
- Results: Their original payment of around $3,400/month would drop to approximately $2,520/month. This makes the new home’s mortgage much more manageable. An amortization calculator can show the long-term impact in detail.
How to Use This Mortgage Recast Calculator
- Enter Your Current Mortgage Balance: Input the total amount you still owe on your home loan.
- Provide Your Annual Interest Rate: Enter the interest rate on your existing mortgage. This rate will not change.
- Input the Remaining Loan Term: State the number of years left until your mortgage is scheduled to be paid off.
- Enter the Lump-Sum Payment: Input the amount you plan to pay toward the principal in a single payment.
- Click “Calculate”: The tool will instantly show your new, lower monthly payment and other key figures.
- Interpret the Results: The primary result is your new payment. The calculator also shows your original payment for comparison and your total interest savings. The chart and table provide a deeper look at the benefits.
Key Factors That Affect a Mortgage Recast
- Lender Policy: Not all lenders offer mortgage recasting. You must check with your loan servicer first.
- Loan Type: Government-backed loans like FHA, VA, and USDA loans are typically not eligible for recasting. Conventional loans are the most common candidates.
- Minimum Payment: Lenders often require a minimum lump-sum payment, which could be $10,000, $25,000, or a percentage of your loan balance.
- Recasting Fees: While much cheaper than refinancing, there is usually a small administrative fee, typically a few hundred dollars.
- Payment History: You will need a history of on-time payments to qualify.
- Your Financial Goals: Recasting is ideal for lowering monthly payments. If your goal is to pay off the loan faster, simply making an extra mortgage payment calculator without recasting would achieve that.
Frequently Asked Questions (FAQ)
1. Is mortgage recasting the same as refinancing?
No. Recasting adjusts your payment on your existing loan after a large principal payment. Refinancing replaces your old loan with a completely new one, with a new rate and term. Comparing a mortgage recast vs refinancing is a critical step for any homeowner.
2. Does recasting change my interest rate?
No, your interest rate and loan maturity date remain exactly the same, which is a major benefit if you already have a low rate.
3. How much does it cost to recast a mortgage?
Fees are minimal, usually between $150 and $500. This is significantly less than the closing costs associated with refinancing.
4. How much will I save with a mortgage recast?
This calculator shows your potential savings. By reducing the principal, you reduce the total interest that accrues over the remaining term, which can lead to thousands of dollars in savings.
5. Will a mortgage recast pay my loan off sooner?
No. The purpose of a recast is to lower your monthly payment while keeping the original loan term. If you want to pay the loan off faster, you should continue making your original, higher payment after the recast or simply apply extra funds to the principal without recasting.
6. What is the minimum lump-sum payment required?
This varies by lender, but minimums often start at $10,000. Some lenders may require a percentage of your loan balance.
7. Are all types of loans eligible for recasting?
No. Government-backed loans (FHA, VA, USDA) are generally not eligible. It’s most common for conventional conforming loans.
8. How long does the recast process take?
Once you make the lump-sum payment and submit the request, it can take 30-60 days for the lender to process it and for your new payment to take effect.