Every fixed-rate mortgage has exactly three moving parts: the rate, the term, and the payment. Fix any two and the third is determined by arithmetic. That is the whole reason these three tools exist and the whole reason they are not interchangeable — each one holds two parts still and moves the third.
Get this wrong and you can spend a $50,000 windfall on the option that saves you $51,281 when the option next to it would have saved you $152,577. Both are sensible choices for somebody. They are not sensible for the same person.
The three levers
Read the table by what doesn't move. Prepaying and recasting both leave your rate alone — which is precisely why they matter to anyone holding a loan cheaper than today's market. A refinance is the only one that touches the rate, and it charges you for the privilege.
Prepaying: shorter loan, same payment
You send extra money and instruct the servicer to apply it to principal. Your required payment does not change. The balance simply falls faster than the schedule expects, so every subsequent month accrues interest on a smaller number, and the loan runs out of balance early.
This extracts the maximum possible interest saving from a given dollar, because the entire benefit is spent on killing the loan rather than on your monthly comfort. It costs nothing, requires nobody's permission, and works on every loan type. The mechanics are covered in full in how extra mortgage payments actually work.
Recasting: same loan, smaller payment
Also called re-amortization. You make a large lump-sum principal payment and then ask your servicer to recalculate the monthly payment against the new, smaller balance, spread over the original remaining term. Your note stays intact. Your rate does not move. Your maturity date does not move. Only the payment falls.
Because nothing is being re-underwritten, there is no appraisal, no credit pull, no title work and no closing costs. There is a flat administrative fee, typically $150 to $500, and a minimum lump sum, typically $5,000 to $10,000. Processing commonly takes 45 to 90 days.
The eligibility rules are where people get caught:
- Conventional only. Recasting is available on loans backed by Fannie Mae and Freddie Mac, and on many jumbo loans held in a lender's own portfolio. FHA, VA and USDA loans cannot be recast — those servicing guidelines contain no re-amortization provision. If you hold one and need a lower payment, a refinance is your only route.
- First liens only. A second mortgage is not eligible.
- You must be current, not in an active bankruptcy, and not inside an interest-only period.
- Seasoning applies. Many servicers want the loan to be 60–90 days old, or 60–90 days past a servicing transfer, before they will process one.
- Frequency may be capped — some investors permit only one recast in any 12-month period.
It is a lender-controlled option, not a federal right, so policies vary. Front-line staff often do not recognise the word. Ask for a “principal reduction with re-amortization” and escalate if you get a blank response.
Refinancing: a different loan entirely
You take out a new mortgage and use it to extinguish the old one. Everything is on the table: rate, term, payment, loan type, and who services it. Everything is also re-underwritten — credit, income, appraisal — and you pay closing costs of roughly 2–5% of the loan amount for the privilege.
A refinance is the right tool when the rate is the problem, or when the structure of the loan is the problem — escaping an ARM before it adjusts, or escaping FHA mortgage insurance that will otherwise last the life of the loan. It is the wrong tool when your rate is already good. The breakeven arithmetic, and the widely-repeated version of it that is wrong, has its own piece: the refinance calculator shows the term-reset trap directly.
The same $50,000, three ways
Take the site's house example: a $400,000 loan at 6.5% over 30 years, so a payment of $2,528.27. You are five years in. You have made every payment on schedule, so the balance is $374,444 with 300 months left to run. An inheritance arrives: $50,000.
$50,000 against a $374,444 balance at 6.5%, 300 months remaining
Both rows applied the identical $50,000 to the identical balance on the identical day. The difference is entirely in what you asked the servicer to do afterwards.
That $101,296 is not a penalty and it is not a rip-off. It is the price of the cash flow, and for some people it is worth paying — a household whose monthly budget is genuinely tight is buying $337.60 of breathing room every month for thirty years. But it should be a decision, taken with the number in front of you, and it almost never is.
The trap: a big principal payment does not lower your payment
This is the single most common and most expensive misunderstanding in this whole area, and it cuts both ways.
If you post $50,000 to your servicer marked “apply to principal” and do nothing else, your required monthly payment does not change. You have prepaid. That is a fine outcome — it is the outcome that saves the most interest — but if you were expecting your bill to drop next month, it will not, and no amount of arguing will make it. The payment on a fixed-rate note is fixed by the note.
To lower the payment you must separately request the recast, pay the fee, and sign the recast agreement. It is an administrative act, and the servicer will not initiate it for you.
The reverse error is worse. Money sent without explicit instructions is frequently applied to your next scheduled payment instead of to principal — which means you have simply paid next month's bill early and saved essentially nothing. Always send extra money with written instructions that it is a principal-only curtailment, then check the following statement to confirm the balance actually moved.
Choosing between them
Prepay when your goal is to be free of the loan and you do not need the monthly relief. It is the interest-minimising choice and it is free.
Recast when you have a rate worth protecting, a lump sum in hand, and a real need for lower monthly outgoings. The classic case is buying before selling: you close on the new house, the old one sells three months later, and you recast the proceeds into the new mortgage rather than refinancing a rate you were happy with. Anyone still holding a 2020–21 loan in the 3% range should be looking at a recast rather than a refinance, because a refinance would surrender the rate.
Refinance when the rate itself is the problem, or the loan structure is. If your rate sits meaningfully above the market and you will hold the loan past the breakeven point, a refinance is the only tool that lowers the interest charged on the entire balance rather than just the part you paid down.
And if you hold an FHA, VA or USDA loan, the recast column simply does not exist for you. Prepay, or refinance.
Frequently asked questions
Does recasting shorten my loan?
No. That is the defining feature of a recast: the maturity date does not move. You pay a smaller amount for the same remaining number of months. If your goal is an earlier payoff, prepaying without recasting achieves it and costs nothing.
Can I prepay and recast at the same time?
Yes, and it is a reasonable strategy. Recast the lump sum to bring the required payment down, then keep voluntarily paying the old, higher amount. You get the lower payment as a safety net if your income drops, while still retiring the loan early in the meantime. You pay the recast fee for the option value.
Will a recast hurt my credit score?
No. A recast is an administrative change to an existing note. There is no new loan application and no credit pull. Your balance and payment fall, which if anything reads positively.
Can I recast an FHA or VA loan?
No. Federal servicing guidelines for FHA, VA and USDA loans contain no re-amortization provision. The only ways to change the payment on those loans are a refinance (including the FHA Streamline and VA IRRRL programmes) or, in genuine hardship, a loan modification — which is a different thing entirely and is not a planning tool.
Does a recast get rid of PMI?
Not automatically, but a large principal reduction may put you below the 80% loan-to-value threshold, at which point you can request cancellation. That is a separate request with its own requirements — see how to actually get PMI removed.
How long does a recast take?
Commonly 45 to 90 days from the point the servicer has both your lump sum and the fee. You will be sent a recast agreement to execute, and a new amortization schedule. Budget for the delay if you are coordinating it with a home sale.
Mortgage Ledger publishes educational information, not personalized financial, legal, tax, lending, or investment advice. The figures here are estimates built on stated assumptions and will not match a lender’s underwriting exactly. Confirm any number that matters against your Loan Estimate and a licensed professional before you act on it.