Mortgage Recast vs. Refinance Analyzer
Decide between a mortgage recast or refinancing. Model the impact of a principal lump sum, compare fee overheads, and see which strategy yields higher savings.
Reviewed by Marcus Vance, Senior Credit & Loan Policy Advisor — Last updated
Current Mortgage Status
Recast & Refinance Targets
Strategy Evaluation & Payment Reductions
| Metric | Mortgage Recast | Refinance Path |
|---|---|---|
| Upfront Cost / Fees | $250 | $6,000 |
| New Outstanding Balance | $300,000 | $350,000 |
| Interest Rate | 5.50% | 4.75% |
| Total Lifetime Interest | $178,122 | $193,120 |
Verdict: Recasting is favored because you save on high upfront refinance closing fees while leveraging your lump sum to reduce monthly principal immediately.
Mortgage Recasting vs Refinancing Handbook
Deciding between principal curtailment and interest rate modifications
What this engine does
This comparison calculator helps you model the outcomes of recasting your mortgage with a lump-sum payment vs. refinancing your current balance into a new loan.
When to deploy this tool
Use this tool when you have extra cash (e.g. inheritance, work bonuses, or proceeds from selling another asset) and want to lower your monthly payments for the lowest overhead fees.
How Calculations Work
We calculate your current baseline monthly P&I. For recasting, we subtract your lump sum from the balance and re-amortize the remaining balance over your original term and rate. For refinancing, we compute a new mortgage payment based on your current balance, refinance rate, and new term, then subtract closing costs to find the payback period.
Common Strategic Pitfalls
A common mistake is recasting a high-interest mortgage when refinance rates are significantly lower. Another error is thinking that a recast shortens the term: your maturity date remains exactly the same. Finally, check with your servicer, as FHA and VA loans do not support administrative recasting.
Sources & Assumptions
Calculations are based on industry-standard financial models. To review the mathematical formulas and verification reports in detail, visit our dedicated Financial Methodology page.
Pre-populated data reflects estimated national averages sourced from county tax agencies and regional insurance reports. Homeowners can customize these percentages inside advanced settings cards.
PMI is modeled at 0.75% of the initial loan principal annually for LTV ratios exceeding 80%, automatically terminating in calculations when the outstanding loan balance drops to or below 80% of the initial purchase price.
Frequently Asked Questions
What is a mortgage recast?
A mortgage recast occurs when you pay a lump sum of principal toward your home loan, and the lender re-amortizes the remaining balance. This lowers your monthly payment while keeping your original interest rate and term unchanged.
How does a recast differ from refinancing?
Refinancing replaces your current mortgage with an entirely new loan, changing your interest rate, term, and lender, which requires closing costs. Recasting keeps your original mortgage intact, only recalculating payments for a nominal fee.
What is the typical fee for a mortgage recast?
Most loan servicers charge a flat administrative fee for recasting, typically ranging from $150 to $300. This is significantly cheaper than refinancing closing costs, which run between 2% and 5% of the loan amount.
Does a mortgage recast shorten the loan term?
No. A recast does not shorten your loan term. If you have 22 years remaining on a 30-year mortgage, you will still have 22 years remaining after recasting. The key difference is your mandatory monthly payment size will be reduced.
Is a credit check required to recast a mortgage?
No. Because you are not applying for a new loan, lenders do not require a credit pull, income verification, or property appraisals to complete a recast. You must simply meet their minimum lump-sum requirements.
Do all mortgage types support recasting?
Most conventional loans back by Fannie Mae and Freddie Mac support recasting. However, FHA, VA, and USDA loans do not officially allow recasting. Additionally, jumbo loans have varying rules depending on the investor.
Will my property escrow account change after recasting?
No. Your property tax and homeowners insurance escrow obligations remain the same. The recast only recalculates the principal and interest (P&I) portion of your monthly mortgage payment.
How much principal must I pay to qualify for a recast?
Most mortgage servicers require a minimum lump-sum principal payment of $5,000 or 10% of the remaining loan balance, though exact requirements vary. Check with your servicer for their specific terms.
Can I recast multiple times on the same mortgage?
Yes. Many lenders allow you to recast multiple times over the life of your mortgage, provided you pay their fee and meet the minimum principal payment guidelines each time.
Is interest rate reduced during a recast?
No. Your interest rate remains exactly the same. The interest savings from recasting come solely from the reduction in the total outstanding principal balance upon which interest is compounded.
Financial Disclaimer
This calculator is intended for planning and educational purposes only. It relies on assumptions and information provided by you regarding your goals, expectations, and financial situation. Results should not be used as your sole source of information. Outputs are estimates only and do not constitute a loan offer, financial advice, legal advice, tax advice, or solicitation. Consult qualified professionals before making financial decisions.