Mortgage Recast vs. Refinance: Two Very Different Ways to Lower a Payment
A recast changes the payment math. A refinance replaces the loan. Confusing the two can cost thousands.
TL;DR
- A recast keeps your existing mortgage and recalculates the payment after a large principal payment.
- A refinance pays off the old loan with a new loan that has new rate, term, costs, and underwriting.
- Recasting is useful when you like your current rate but want a lower monthly payment.
- Refinancing is useful when a new rate, term, or loan type is worth the closing costs.
- Not all loans can be recast. Confirm with the current servicer before making a large principal payment.
What a mortgage recast is
A mortgage recast, also called re-amortization, happens when you make a large principal payment and ask the servicer to recalculate the monthly payment over the remaining loan term. The interest rate does not change. The maturity date does not change. The loan is not replaced.
Example:
| Item | Before recast | After recast | | --- | --- | --- | | Balance | $400,000 | $300,000 after principal payment | | Interest rate | 5.50% | 5.50% | | Remaining term | 27 years | 27 years | | Monthly P&I | Higher | Lower because balance is lower |
The payment drops because the same remaining term is now spread over a smaller balance.
What a refinance is
A refinance is a new mortgage. The new loan pays off the old loan. You go through application, credit, income review, appraisal or valuation, closing disclosures, and closing costs. The new loan can change the rate, term, loan type, borrower list, mortgage insurance, and cash-out amount.
Refinancing can be powerful, but it is not free. The question is whether the new loan's benefits exceed the costs and reset risks.
When recasting makes sense
Recasting is often useful after:
- Selling a prior home and applying proceeds to the new mortgage
- Receiving a bonus, inheritance, or liquidity event
- Buying before selling and later reducing the balance
- Wanting lower required monthly payment without losing a favorable rate
It is especially attractive when current market rates are higher than your existing rate. If your current loan is at 4.50% and new loans are near 7%, refinancing to lower the balance would be painful. A recast keeps the 4.50%.
When refinancing makes sense
Refinancing may be better when:
- Market rates are meaningfully lower than your current rate
- You want to shorten or lengthen the term
- You need to remove a borrower from the loan
- You want to switch from FHA to conventional to remove mortgage insurance
- You need cash out
- You want to move from ARM to fixed
The break-even math matters. If a refinance costs $6,000 and saves $250 per month, the simple break-even is 24 months. If you may sell before then, the refinance may not pay off.
Recast requirements
Rules vary by servicer and investor. Common requirements include:
- Minimum principal payment, often $5,000 to $20,000
- Recast fee
- Loan must be current
- Waiting period after closing
- No active bankruptcy or loss mitigation
- Loan type must allow recasting
Conventional loans are the most common recast candidates. Jumbo and portfolio loans vary. FHA, VA, and USDA loans often have limited or no standard recast option.
Recast vs. just paying extra principal
If you make an extra principal payment without recasting, the loan balance drops and you pay less interest over time, but the required monthly payment usually stays the same. You may pay the loan off earlier.
If you recast, the required monthly payment drops. You can still pay extra voluntarily, but you gain payment flexibility.
| Action | Required payment changes? | Interest savings? | | --- | --- | --- | | Extra principal only | Usually no | Yes | | Recast after principal payment | Yes, lower | Yes | | Refinance | Yes, depends | Depends on new rate and costs |
Questions to ask the servicer
Before sending a large payment, ask:
- Does my loan allow recasting?
- What is the minimum principal curtailment?
- What is the fee?
- How long does processing take?
- Will automatic payments update automatically?
- Does the recast affect escrow?
- Can I recast more than once?
Get the instructions in writing. You want the payment applied as principal and processed under the recast rules, not treated as a normal extra payment only.
Bottom line
Use a recast when the existing loan is worth keeping and the goal is payment flexibility. Use a refinance when the new loan is meaningfully better after costs. They are both legitimate tools, but they solve different problems.