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Guide

Mortgage Recast vs Refinance: Which Fits Your Situation

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A recast lowers the payment after a lump-sum principal payment and keeps the note rate, while a refinance replaces the loan.

Published: 2026-10-19

Key takeaways

  • Fannie Mae describes a recast as a re-amortization after a substantial principal curtailment. The monthly payment falls because the balance is lower. The remaining term is unchanged.
  • Extra principal without a recast lowers the balance and leaves the required payment in place.
  • A refinance pays off the old loan. The CFPB says you usually pay closing costs, and a lower payment can come from a longer term as well as from a lower rate.
  • At an illustrative 6% rate, a $50,000 curtailment on $300,000 with 25 years left drops the payment from $1,932.90 to $1,610.75.
  • Restarting the $250,000 balance for 30 years at that same rate lowers the payment again and raises total interest.

Published: 2026-10-19

A mortgage recast applies a lump-sum principal payment and then recalculates the monthly principal and interest on the new balance. The note rate and the remaining term stay in place. A refinance pays off the old loan with a new loan, which can change the rate, the term, and the costs.

The numbers below use an illustrative 6% rate, not a quote. A recast happens only when the servicer and the loan's owner allow it. A refinance price comes from a Loan Estimate.

What does a recast change?

Fannie Mae's loan-delivery overview says it will purchase a re-amortized loan after a substantial principal curtailment. The new balance is spread over the remaining term, so the payment falls. The only change to the original note terms is that lower payment. The borrower was already fully qualified on the original note amount.

Servicing Guide C-1.2-01 says the servicer must accept and apply a principal curtailment the borrower identifies on a current loan. If the borrower then asks to lower the contractual payment, the servicer completes Form 181, revises only what the form allows, gives it to the borrower and the document custodian, and decides whether the borrower must sign so the loan keeps first-lien enforceability. Fannie Mae does not treat that re-amortization as a modification when it later checks modification eligibility.

Extra principal without Form 181 still reduces the balance. The required payment stays on the old schedule, and the loan can end sooner. Whether your loan can be recast depends on the note, the servicer, and the investor. Ask before you move a large sum.

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How does the payment math work?

The CFPB says lenders calculate principal and interest with a standard formula from the loan amount, the term, and the interest rate. The monthly rate here is 6 percent divided by 12, or 0.5 percent. Each month's interest is the prior balance times 0.005, rounded to the cent. The last payment changes by a few dollars so the balance lands on zero. The 6% figure is an illustrative rate, not a quote, a lock, or an APR.

Illustration, not a quote. The remaining balance is $300,000. The remaining term is 25 years, which is 300 payments. The illustrative rate is 6%.

The scheduled principal and interest is $1,932.90. Over the 300 payments, with cent rounding, total interest is $279,872.80. The final payment is $1,935.70.

You then pay $50,000 toward principal and recast the loan. The new balance is $250,000. The rate is still the illustrative 6%. The remaining term is still 300 months.

The new scheduled payment is $1,610.75. That is $322.15 lower each month. Total interest left on the recast schedule is $233,227.39. Compared with leaving the $300,000 balance on the old payment, the recast charges $46,645.41 less interest. The $50,000 reduces principal.

Run your own balance and term in the mortgage calculator once you have the rate from your statement, not this 6% illustration.

Taxes and insurance sit on top of either payment. A lower principal and interest line does not freeze the escrow deposit. How that deposit is reset is covered in mortgage escrow accounts.

What does a refinance change instead?

The CFPB's mortgage key terms define a refinance as a new loan that pays off the old one. Common reasons are a lower rate, a lower payment, or borrowing more money. You usually pay closing costs. If the payment drops, separate how much comes from a lower rate and how much comes from a longer term.

The CFPB refinance handout says you may repeat many of the original steps and costs. The Loan Estimate shows the features, any prepayment penalty, and the total dollar cost. A lower payment stretched over more years can raise the total cost. Property taxes and homeowners insurance can stay even when principal and interest change.

The new-loan steps are in the complete guide to refinancing your mortgage. The same cost check is on refinance versus purchase, and term length is in 15-year versus 30-year.

Same illustration, so the term is the only change. Take the $250,000 balance after the $50,000 principal payment and start a new 30-year loan at the same illustrative 6% rate, not a quote. That is 360 payments.

The scheduled payment is $1,498.88. It is $434.02 lower than the old $1,932.90 payment, and $111.87 lower than the recast payment of $1,610.75. Total interest on this 30-year schedule is $289,593.37.

That interest is $56,365.98 more than the recast and $9,720.57 more than the interest left on the original 25-year schedule. Closing costs on the Loan Estimate are not in this comparison. Divide those costs by the monthly savings to see how long the cash takes to come back.

Which path fits the reason you have the cash?

Use a recast when you want a lower required payment, you can keep the note rate and the remaining years, and the servicer will re-amortize. The $50,000 illustration cuts the payment by $322.15 and cuts remaining interest, without a new loan.

Use a refinance when you need a different rate, a different term, a different loan type, or cash out. You underwrite a new loan and pay the costs on the Loan Estimate. A lower payment from restarting the clock is a longer loan.

A curtailment without a recast keeps the required payment at $1,932.90 in the illustration and can end the loan sooner. Ask the servicer to apply the extra amount to principal. Before a refinance, check for a prepayment penalty. The CFPB handout says you pay that penalty if the documents impose one and you refinance.

Put the balance, the remaining months, and the rate on your statement into the mortgage calculator, then set the Loan Estimate costs beside that payment. The refinance guide maps the new-loan steps.

This article is educational and is not a loan offer or financial advice.

Sources

Frequently asked questions

Does a recast give me a new interest rate?

No, on the Fannie Mae recast in the selling and servicing guides. The payment is recalculated on the new balance over the remaining term. A new rate is a refinance, priced on a Loan Estimate.

Will extra principal lower the payment by itself?

The balance drops. The required payment stays the same until the servicer re-amortizes the loan with Form 181.

Is the 6% figure my rate?

No. It is an illustrative 6% rate, not a quote, not a lock, and not a forecast. The example holds the rate still so only the balance and the term change.

Why is the refinance payment lower and the interest higher?

Both use an illustrative 6% rate and $250,000. The refinance has 360 payments and the recast has 300, so the payment is lower and lifetime interest is higher. Closing costs add to the refinance.

Can every loan be recast?

Fannie Mae's guide covers loans serviced under that guide. Other loans depend on the servicer and the investor. Ask before you send a lump sum.