Making extra principal payments and recasting a mortgage both start the same way — you send the lender more money than you owe. But they produce very different outcomes. One shortens your loan; the other lowers your monthly payment. Here is exactly how each works, and how to choose.
What extra payments do
When you pay extra principal on a standard U.S. fixed-rate mortgage, your scheduled monthly payment does not change. The loan simply reaches a zero balance earlier than the original schedule. Every future month's interest is calculated on the new, lower balance, so more of each fixed payment goes to principal — and the loan ends years sooner.
- Payment: unchanged
- Term: shorter
- Total interest: lower
- Cost: free
- Flexibility: you can pay any amount, any month, or stop entirely
What a recast does
A recast (also called re-amortization) is a formal request to your servicer: you make a large lump-sum principal payment, and the lender recalculates your monthly payment over your remaining original term using the new lower balance. Your interest rate and payoff date stay the same; your monthly payment drops.
- Payment: lower
- Term: unchanged (same payoff date as the original schedule)
- Total interest: lower than doing nothing, but higher than if you had applied the same lump sum as a plain extra payment and kept paying the old amount
- Cost: typically a flat fee, often in the $150–$500 range, plus a minimum principal reduction requirement (commonly $10,000 or a set percentage)
- Flexibility: one-time event; you generally cannot recast repeatedly
Side by side
| Extra payments | Recast | |
|---|---|---|
| Monthly payment | Stays the same | Goes down |
| Payoff date | Moves earlier | Stays the same |
| Interest rate | Unchanged | Unchanged |
| Lifetime interest saved | Most | Less |
| Cost | $0 | Flat fee (~$150–$500) |
| Credit check / appraisal | No | No |
| Improves monthly cash flow | No | Yes |
A worked example
Suppose you have a $300,000 balance at 6.5% with 30 years remaining. The payment is about $1,896 (principal and interest). You come into $60,000.
- Apply it as an extra payment, keep paying $1,896: the loan pays off many years early and you save the most interest overall. Your budget still needs $1,896 a month.
- Recast with the $60,000: the balance becomes $240,000, re-amortized over the same 30 years at 6.5%. The new payment falls to roughly $1,517 — about $379 a month freed up — but you are still scheduled to pay for the full 30 years, so lifetime interest savings are smaller.
- Recast, then keep paying $1,896 anyway: you get the lower required payment as a safety net, but by voluntarily overpaying the new lower payment you still knock years off the loan. This is the best-of-both approach if your servicer allows it.
Model both the lump sum and the ongoing extra with our lump sum calculator and main extra payment calculator to see the interest difference for your actual numbers.
Which lenders allow recasting?
Recasting is a servicer policy, not a legal right. General patterns in the U.S. market:
- Conventional loans (backed by Fannie Mae or Freddie Mac) are usually eligible, subject to the servicer's fee and minimum-principal rules.
- FHA, VA and USDA loans generally cannot be recast.
- Jumbo and portfolio loans vary by lender.
Call your servicer and ask three questions: Do you offer recasting on my loan type? What is the fee? What is the minimum principal reduction required to qualify? Get the answer in writing before you send money.
When a recast makes sense
- You have a large lump sum and you want lower monthly obligations — for example, moving to one income, approaching retirement, or freeing room for other goals.
- You bought before selling your previous home and want to "re-cast" the new loan once the old house sells.
- Your rate is good and you do not want to refinance (which would cost more and might raise your rate), but you want the payment relief a refinance would bring.
When to skip the recast and just pay extra
- Your priority is paying the least total interest and being debt-free soonest.
- You can comfortably afford the current payment and do not need cash-flow relief.
- Your loan is FHA/VA/USDA, or your servicer does not offer recasting.
- You would rather keep the lump sum liquid and invested — see pay off early vs. invest.
Recast vs. refinance
A recast keeps your existing note — same rate, same term, no underwriting, small fee. A refinance replaces the loan entirely: new rate, new term, full application, and closing costs that typically run 2–5% of the loan amount. If today's rates are lower than yours, a refinance may win despite the cost. If your rate is already low, a recast is the cheap way to cut the payment.
| Recast | Refinance | |
|---|---|---|
| Interest rate | Unchanged | New (market) rate |
| Credit check / appraisal | No | Yes |
| Cost | ~$150–$500 flat | 2–5% of loan (often $4,000–$12,000) |
| Requires a lump sum | Yes (often $10,000 min) | No |
| Time to complete | 2–6 weeks | 3–6 weeks, more paperwork |
| Best when | Your rate is good; you have cash; you want a lower payment | Market rates are meaningfully below yours |
Step by step: how to request a recast
- Call your servicer (the company you send payments to, which may not be your original lender) and ask: "Do you offer principal curtailment with re-amortization — a recast — on my loan?" Confirm your loan type; FHA, VA and USDA loans generally cannot be recast.
- Get the terms in writing: the flat fee, the minimum principal reduction required (a dollar figure or a percentage of the balance), and whether there is a limit on how often you can recast.
- Make the lump-sum principal payment as instructed — sometimes it must be a separate "principal only" payment, sometimes it is submitted together with the recast request form.
- Submit the recast request form and pay the fee. Some servicers process automatically once a qualifying principal payment posts; most require the form.
- Review the new amortization schedule the servicer sends. Check that the rate and maturity date are unchanged and only the payment dropped.
- Update autopay to the new lower amount — or, if you want to keep attacking the balance, deliberately keep paying the old amount (see below).
The best-of-both move: recast, then keep overpaying
If your servicer allows it, the strongest play with a large lump sum is often:
- Recast, which lowers your required payment and gives you a permanent safety net if your income ever drops.
- Then voluntarily keep paying your original (higher) payment amount, with the difference going to principal.
You get the lower obligation and a shorter payoff. The only cost is the recast fee. This is especially useful for households with variable income — a lower floor in bad months, faster payoff in good ones.
The bridge scenario: buying before selling
A common reason to recast: you bought a new home before your old one sold, so you took a larger loan (or a smaller down payment) than you wanted. When the old house closes, you apply the net proceeds to the new mortgage and recast. Your payment drops to what it would have been with the down payment you always intended, without the cost and rate risk of refinancing. Ask your lender before closing on the new home whether the loan is recast-eligible — make it part of choosing the loan.
Taxes and credit
- A recast is not a taxable event. You are paying down your own debt, not receiving income.
- It does not trigger a hard credit inquiry and does not create a new tradeline — your credit report still shows the same loan.
- The lump sum is not tax-deductible (it is principal, not interest), and your future mortgage-interest deduction, if you get one, will be smaller because you owe less. See the deduction guide.