Recast vs Extra Principal Payment
With the same lump sum you have two ways to use it. A recast lowers your monthly payment and keeps your end date. Paying the lump sum toward principal and keeping your payment ends the loan sooner and costs less interest. On a $300,000 loan at 4.5% with 25 years left, a $50,000 lump sum gives:
- Recast: payment $1,389.58, loan ends in 25 years, $166,874 of interest left.
- Extra payment: payment $1,667.50, loan ends in 18 years 5 months, $118,000 of interest left.
The two paths
Both paths start the same way: the lump sum goes onto your principal balance. What differs is the payment you make afterwards.
- Recast. Your servicer recalculates the payment on the smaller balance. The rate and end date stay. PNC says a recast keeps your current interest rate and end date.
- Extra principal payment. The balance falls, but the payment stays. PNC says extra payments do not trigger a new payment schedule.
Keeping the old payment on a smaller balance means more of each payment goes to principal, so the loan ends early.
One loan, four lump sums
The loan: $300,000 balance, 4.5% rate, 25 years left, a current payment of $1,667.50 (principal and interest). Without a lump sum you would pay $200,249 of interest over the 25 years.
| Lump sum | Recast: new payment | Recast: interest left | Extra payment: loan ends in | Extra payment: interest left | Interest gap |
|---|---|---|---|---|---|
| $10,000 | $1,611.91 | $193,574 | 23 y 7 m | $180,472 | $13,102 |
| $25,000 | $1,528.54 | $183,562 | 21 y 6 m | $154,236 | $29,326 |
| $50,000 | $1,389.58 | $166,874 | 18 y 5 m | $118,000 | $48,874 |
| $100,000 | $1,111.66 | $133,499 | 13 y 4 m | $66,155 | $67,344 |
Interest left means the interest you still pay from the month after the lump sum. The lump sum itself and any recast fee are not counted. The gap is the extra interest the recast path pays compared with the extra payment path.
Putting the lump sum on principal and keeping the old payment saves the most interest. Chase says a recast can reduce or eliminate the interest you would save this way. Wells Fargo warns that its jumbo loan recast can mean more interest over the full term.
What you give up either way
- With a recast you keep the 25 years, so the interest gap above is the price of the lower payment. In the $50,000 case you pay $277.92 less each month and $48,874 more interest.
- With the extra payment your monthly bill does not move. You get the interest saving and the early payoff, and nothing in your monthly budget changes.
If you want both, you can recast and then keep paying the old amount. You get the lower required payment as a safety net, and the early payoff of the extra payment path. You also pay the recast fee for that choice.
Try your own numbers
The calculator below opens with the $50,000 example. Change the balance, rate, years left and lump sum to see your recast payment. To get the extra payment path, keep your current payment and look at the amortization schedule: the guide on the recast amortization schedule shows the balance year by year.
How to decide
- Need a lower bill? Choose the recast. Check how much it lowers the payment in how much will a recast lower my payment.
- Want the lowest total interest? Choose the extra payment and keep your payment.
- Check your lender. Not every loan can be recast, and fees and minimums differ. See recast fees and rules by lender.
- Thinking about a new loan? Compare a refinance too in recast vs refinance.
Frequently asked questions
Is a recast better than paying extra principal?
It depends on what you want. A recast lowers the monthly payment and keeps the end date. Paying principal and keeping your payment saves more interest and ends the loan sooner. Neither is better for everyone.
Does a big extra payment lower my monthly payment by itself?
No. PNC says extra payments do not trigger a new payment schedule. Your required payment stays the same until the servicer recasts the loan.
Can I keep the old payment after a recast?
In the math, yes: if you pay the old amount on the recast balance, the loan ends early, as in the extra payment path, and the lower required payment is there if money gets tight. Ask your servicer how it applies payments above the required amount.
Which path leaves me more room if I lose income?
The recast. The lower required payment is yours for the rest of the loan. With the extra payment path your required payment is unchanged, even though the balance is smaller.
Does the recast fee change the answer?
Fees vary by lender. The fee is not in the table, so add it to the recast path when you compare. See the fees by lender before you decide.
What if I do not need a lower payment?
Then the extra payment path usually wins on cost: the table shows the interest left under each path. A recast makes sense when the lower payment is the goal.
Sources
Every figure on this page comes from the pages below. Checked 2026-10-16. Rules change, so confirm with your own servicer.
- PNC: What is a mortgage recast (a recast keeps rate and end date, extra payments do not trigger a new schedule)
- Chase: Recast your mortgage loan (a recast can reduce or eliminate the interest savings of extra principal payments)
- Wells Fargo: Maximizing cash flow while buying a home (jumbo loan recast can mean more interest over the full term)
More recast guides
- Free Mortgage Recast Calculator - enter your own loan and see the new payment.
- Recast vs Refinance Calculator - Compare both options on the same loan, with a break-even point.
- Recast Fees and Rules by Lender - Fees, minimums and loan limits published by four large lenders.
- How to Calculate a Recast Payment - The formula, a step-by-step example and the numbers to check.
- How Much Will a Recast Lower My Payment? - The lump sum divided by balance shortcut, with lookup tables.
- Recast Amortization Schedule - Balance and interest by year, before and after a recast.