If you have extra cash and want to lower your monthly mortgage payment, you have two main options: a mortgage recast or a refinance. A recast keeps your existing loan but reduces your monthly payment after you apply a lump sum to principal, typically for a fee of $250 to $500. A refinance replaces your loan entirely, which can lower your interest rate but often costs 2% to 5% of the loan amount in closing costs. Which one saves more money depends on today's interest rates compared to your current rate, how much cash you have available, and how long you plan to stay in the home.
What Is a Mortgage Recast vs. Refinance and How Does It Work?
A mortgage recast (sometimes called a re-amortization) is when your lender recalculates your monthly payment based on a lower remaining principal balance. You keep the same interest rate and the same loan term, but because you've paid down a chunk of principal, your monthly payment drops. Most lenders require a minimum lump sum of $5,000 to $10,000 and charge a small administrative fee.
A refinance, on the other hand, pays off your existing mortgage with a brand-new loan. The new loan can have a different interest rate, a different term, or both. Refinancing involves a full underwriting process, an appraisal, and closing costs that typically run 2% to 5% of the new loan balance.
Here's a concrete example. Say you have a $320,000 mortgage at 6.5% with 25 years remaining. Your monthly principal and interest payment is about $2,162. Now imagine you have $40,000 in savings you want to put toward the loan.
Recast math (plain English): Subtract the $40,000 lump sum from the $320,000 balance to get $280,000. Then recalculate the monthly payment on $280,000 at 6.5% over the remaining 25 years. The new payment drops to about $1,892, saving you $270 per month. You pay a one-time recast fee of around $300.
Refinance math: If rates have dropped to 5.5%, refinancing $320,000 over a new 30-year term gives you a monthly payment of about $1,817. But you'll pay $8,000 to $16,000 in closing costs, and you've reset the clock to 30 years, which adds five more years of payments.
How Much Can You Actually Save?
Let's compare the savings on the same $320,000 loan at 6.5% under different scenarios. The recast assumes you apply a lump sum and keep the same rate. The refinance assumes new rates of 5.5% with $10,000 in closing costs rolled into the loan.
| Scenario | Monthly Payment | Total Interest | Payoff Date | You Save |
|---|---|---|---|---|
| Standard loan (no change) | $2,162 | $328,720 | Year 25 | — |
| Recast with $20,000 lump sum | $2,027 | $288,100 | Year 25 | $40,620 |
| Recast with $40,000 lump sum | $1,892 | $247,600 | Year 25 | $81,120 |
| Refinance to 5.5%, 30-year term | $1,873 | $354,280 | Year 30 | -$25,560 (loses) |
| Refinance to 5.5%, 20-year term | $2,271 | $225,040 | Year 20 | $103,680 |
And here's how small monthly extra payments stack up over the life of that same $320,000 loan at 6.5%, without recasting or refinancing — useful for comparison if you don't have a big lump sum:
| Extra Payment | New Monthly Payment | Total Interest | Payoff Date | You Save |
|---|---|---|---|---|
| +$100/month | $2,262 | $286,900 | Year 22 | $41,820 |
| +$250/month | $2,412 | $237,500 | Year 19 | $91,220 |
| +$500/month | $2,662 | $182,300 | Year 15.5 | $146,420 |
The takeaway: if rates have dropped at least 0.75% to 1% below your current rate and you plan to stay in the home for 5+ years, refinancing usually wins. If rates are the same or higher than what you have, a recast almost always saves more because there are no closing costs eating into your savings. Run your specific numbers through our extra payment calculator to see exactly how a lump sum changes your payoff.
Step-by-Step: How to Decide Between Recasting and Refinancing
- Check your current interest rate against today's market rates. Pull your last mortgage statement and compare your rate to the current 30-year fixed average. If today's rates are at least 0.75% lower, refinancing becomes worth investigating. If rates are equal or higher, a recast is almost certainly the better move.
- Confirm your loan is eligible for a recast. Call your servicer and ask directly. Conventional Fannie Mae and Freddie Mac loans typically allow it, but FHA, VA, and USDA loans usually do not. Jumbo loans depend on the lender's specific rules.
- Calculate your break-even point for a refinance. Divide your total closing costs by your monthly savings. If closing costs are $9,000 and you save $300 per month, you break even in 30 months. If you might move before then, skip the refinance.
- Add up your available lump sum. Most lenders require a minimum of $5,000 to $10,000 to qualify for a recast. The larger the lump sum, the bigger your monthly payment drop. Don't drain your emergency fund to do it.
- Build an amortization comparison. Use our amortization schedule tool to model both scenarios side by side. Pay attention to total interest paid, not just monthly payment.
- Request written quotes. For a recast, get the fee in writing from your servicer (usually $150-$500). For a refinance, get a Loan Estimate from at least three lenders within the same 14-day window to protect your credit score.
- Lock in your decision and document everything. If recasting, send the lump sum with written instructions stating "apply to principal and recast." If refinancing, lock your rate as soon as you've chosen a lender and respond to underwriter requests quickly to avoid delays.
Common Mistakes Homeowners Make with Recasting and Refinancing
- Refinancing into a new 30-year term without doing the math. A lower monthly payment feels great, but if you reset the clock from year 5 of a 30-year loan back to year zero, you can pay tens of thousands more in interest over time even at a lower rate.
- Forgetting to specifically request a recast. If you mail in a big lump sum without writing "apply to principal and recast" on the check or in the online payment notes, your servicer will just apply it to principal. Your loan balance drops, but your monthly payment stays the same.
- Ignoring closing costs in the refinance comparison. Many homeowners look only at the new monthly payment and the new rate. But $10,000 in closing costs rolled into the loan means you're paying interest on that $10,000 for 30 years.
- Choosing a recast when you should just keep paying extra. If you don't actually need a lower monthly payment, applying the lump sum as a principal-only payment without recasting saves you the fee and pays off the loan faster. Explore other mortgage payoff strategies before committing.
Is a Recast or Refinance Right for You? Key Questions to Ask
1. Have interest rates dropped at least 0.75% below my current rate? If yes, get refinance quotes. If no, recasting is likely your better option because you keep your existing low rate.
2. Do I plan to stay in this home for at least five more years? Refinancing only pays off if you stay long enough to recoup closing costs. If you might move within three years, a recast or extra payments are smarter.
3. Do I have at least $10,000 in cash beyond my emergency fund? A recast requires a substantial lump sum. If you don't have one, consider switching to biweekly payments instead, which effectively adds one extra monthly payment per year with no upfront cost.
4. Do I want a lower monthly payment or a faster payoff? Recasting and refinancing both lower your monthly payment but typically don't speed up the payoff much. If your real goal is to pay off the mortgage years sooner, putting that same lump sum straight to principal without recasting saves more in total interest.
Frequently Asked Questions
How much does a mortgage recast cost?
Most lenders charge between $150 and $500 for a recast, which is a flat administrative fee. Compare that to refinancing, where closing costs typically run 2% to 5% of the loan amount — on a $320,000 loan, that's $6,400 to $16,000.
Does recasting hurt my credit score?
No. A recast doesn't involve a new credit pull, new underwriting, or a new loan, so your credit score is unaffected. Refinancing, by contrast, triggers a hard credit inquiry and can temporarily lower your score by 5-10 points.
Can I recast an FHA or VA loan?
Generally no. FHA, VA, and USDA loans do not allow recasting. If you have one of these loans and want a lower payment, your options are an FHA Streamline Refinance, a VA IRRRL, or simply making extra principal payments without a recast.
How long does each process take?
A recast typically processes in 30 to 45 days after you submit the lump sum and request. A refinance takes 30 to 60 days from application to closing, plus another 3-day rescission period before funds disburse. Both timelines depend on your lender's workload.
Will a recast or refinance shorten my loan term?
A standard recast keeps your original payoff date — only your monthly payment changes. A refinance can shorten your term if you choose a shorter loan (like a 15- or 20-year), but most homeowners refinance into another 30-year, which actually extends the payoff date.
The bottom line: if today's rates are meaningfully lower than your current rate and you plan to stay put, refinancing usually saves more over the long run. If rates haven't dropped or you want to avoid thousands in closing costs, a recast delivers a lower monthly payment with minimal hassle. Either way, run your specific numbers before making a five-figure decision. Try our extra payment calculator to see exactly how much a lump sum or recast would save you on your mortgage.