A mortgage recast can be a useful middle ground between doing nothing and refinancing. If you have a chunk of cash and want a lower monthly payment without changing your existing interest rate, this recasting mortgage loan calculator helps you estimate how much your payment could drop and how much interest you might save over the remaining life of the loan.
What is a mortgage recast?
A mortgage recast is when you make a large one-time payment toward principal and then ask your lender to re-amortize the remaining balance over your existing loan term and rate. In plain language: your interest rate usually stays the same, your loan end date stays the same, but your required monthly payment gets reduced.
Most lenders charge a modest administrative fee to process a recast, and many have minimum lump-sum requirements. Not all loan types are eligible, so always verify with your loan servicer first.
Recast vs. refinance
- Recast: Keeps your current mortgage rate and term, lowers payment after principal reduction, usually lower fees.
- Refinance: Replaces your loan with a new one, can change rate/term, generally higher closing costs and underwriting requirements.
How this calculator works
This calculator compares two scenarios for your remaining loan period:
- Scenario A: Continue with your current balance and payment structure.
- Scenario B: Make a lump-sum payment and recast immediately.
It then estimates:
- Current monthly payment
- New monthly payment after recast
- Monthly payment reduction
- Total remaining interest in both scenarios
- Interest savings and net savings after recast fee
- Simple break-even period on the recast fee
When recasting can make sense
- You received a bonus, inheritance, or proceeds from selling another property.
- You want to lower monthly obligations but keep your current mortgage rate.
- Current market interest rates are higher than your existing loan rate.
- You do not want the paperwork and closing costs of refinancing.
When it may not be your best option
- You need immediate liquidity and cannot tie up a large amount of cash in home equity.
- Your lender does not offer recasting for your specific loan product.
- You could qualify for a much lower rate through refinancing and plan to keep the home long term.
- You have higher-interest debt (like credit cards) that should likely be paid off first.
Example of a recast outcome
Suppose your current balance is $350,000 at 6.5% APR with 25 years remaining. If you apply a $50,000 lump sum and recast, your new required monthly payment can fall meaningfully. You still save interest because your principal dropped, and the recast fee is often small compared with long-term savings.
The exact numbers depend on your loan balance, rate, and remaining term, so run your own scenario using the calculator above.
Before requesting a mortgage recast
1) Confirm lender eligibility rules
Ask about minimum principal payment requirements, fee amount, processing timeline, and any restrictions by loan type (conventional, jumbo, government-backed, etc.).
2) Compare alternatives
Run the numbers against refinancing, making extra principal payments without recasting, and simply retaining liquidity in savings or investments.
3) Keep a cash buffer
Do not deplete your emergency fund. A lower mortgage payment is helpful, but maintaining financial flexibility is equally important.
Frequently asked questions
Does recasting lower my interest rate?
No. A recast typically keeps your existing interest rate. It lowers payment by reducing principal and recalculating amortization.
Will recasting shorten my loan term?
Not usually. Your maturity date generally stays the same. The monthly payment is recalculated over the remaining term.
Is recasting better than making extra principal payments?
It depends on your goal. If you want the lowest required monthly payment, recasting helps. If you keep paying the original higher amount, you may pay off your loan sooner and potentially save more interest.
Educational use only; not financial, legal, or tax advice. Speak with your lender and a qualified advisor before making mortgage decisions.