Mortgage Recast vs. Refinance in San Diego: Lower Your Payment Without Losing Your Rate

If you are sitting on a mortgage rate that starts with a 3 and you have come into a chunk of money, the mortgage recast vs. refinance question in San Diego has a much clearer answer right now than it did five years ago. And most homeowners have never heard of the option that wins.

Here is the short version: a recast keeps your rate and lowers your payment. A refinance at today’s pricing would hand back a rate you will never see again. For a homeowner with a 2020 or 2021 loan, that is not a close call.

Who this is for

This one is for San Diego homeowners who locked something in the 2s or 3s and have since had a liquidity event — a bonus, a vested equity grant, an inheritance, proceeds from selling a rental or an out-of-state property. You have cash. Your payment feels heavy anyway, because everything around it — insurance, taxes, tuition, groceries — went up while your P&I stayed put.

You are not alone in the rate part. Per FHFA’s National Mortgage Database, right around half of all outstanding U.S. mortgages still carry a rate below 4% as of early 2026. FHFA’s own research on the lock-in effect found that for every percentage point the market rate exceeds your note rate, your probability of selling drops about 18.1%. That is the statistical version of what you already feel: the loan is the asset now.

Which is exactly why so many people ask me the wrong question. They ask what refinancing would cost them. The better question is whether they need to touch the loan at all.

What a mortgage recast actually is

A recast — servicers call it re-amortization — works like this. You make a large one-time principal payment. Your servicer then recalculates your monthly principal and interest using three inputs: your new lower balance, your existing interest rate, and your remaining term. Fannie Mae’s servicing guidance spells out that exact recast calculation.

Nothing else changes. Same note. Same rate. Same payoff date. No appraisal, no income documentation, no credit pull, no title work, no escrow account rebuild. Most servicers charge a flat processing fee somewhere between $150 and $500 and require a minimum curtailment — commonly $5,000 to $10,000, though some set it higher or require a minimum percentage of the balance.

A refinance is surgery. A recast is a spreadsheet correction your servicer performs for the price of a decent dinner.

The math on a real San Diego balance

Take an $850,000 loan originated in September 2021 at 3.25% — an extremely ordinary San Diego purchase from that stretch. Five years of payments in, the balance is about $759,100 and P&I runs $3,699 a month. Now suppose $150,000 lands in your account.

Read the bottom row twice. You could hand the lender $150,000 of your own money, pay several thousand more in closing costs, and walk out with a higher payment than you have today. That is the lock-in effect in one line.

The honest trade-off nobody puts in the brochure

Recasting is not free money, and I would rather you hear the downside from me than find it in year four.

Look again at row two of that table. If you put the same $150,000 toward principal and skip the recast — keep making the $3,699 payment you are already making — the loan pays off in roughly 18 years instead of 25, and you pay about $198,500 in remaining interest. Recast instead and you pay about $281,400. Same lump sum, same rate. The recast costs you roughly $83,000 in additional lifetime interest.

So which is right? It depends on what is actually scarce in your life. If you have plenty of monthly margin and you want to be debt-free sooner, prepay and leave the payment alone. If your monthly number is the thing under pressure — you are self-employed with lumpy income, you are carrying two properties, you are funding a business — then $731 a month of permanent, guaranteed cash flow is worth real money.

Amara and I have been repositioning our own portfolio toward monthly cash flow rather than raw equity for a couple of years now, so I will admit some bias. But bias is not advice. Run both columns.

Who cannot recast

• FHA, VA, and USDA loans. Government-backed programs do not permit re-amortization. If you want a lower payment on one of those, your path is a streamline — I covered both in FHA streamline and VA IRRRL in San Diego.
• Some jumbo and portfolio loans. Above San Diego’s conforming limit, the answer lives in your specific note and your servicer’s policy. Ask before you plan.
• Loans that were modified. Servicers routinely exclude previously modified loans.
• Anyone who needs cash, not lower payments. A recast sends money in. If you need it to come out, that is a cash-out refinance conversation instead, and the rate math changes completely.

When a refinance still wins

I do not want to talk anybody out of a transaction that pencils. Refinancing beats recasting when:

• Your current rate is above today’s market — if you closed in 2023 or 2024 in the high 6s or 7s, this whole article is the wrong one for you. Go run your refinance break-even.
• You are paying mortgage insurance you could shed. Killing PMI often beats every other lever — see how to remove PMI in San Diego.
• You need to pull equity out, restructure a second lien, or remove a borrower from the note.

Frequently asked questions

How much do I have to pay down to recast?

It is set by your servicer, not by law. Common minimums run $5,000 to $10,000, though some require more or a minimum percentage of the balance. Call the servicing number on your statement and ask two things: the minimum curtailment and the processing fee.

Does a recast shorten my loan term?

No. That is the whole design. Your payoff date stays exactly where it was and the payment drops instead. If you want the term to shrink, prepay and decline the recast.

Does recasting hurt my credit?

There is no new loan, no hard inquiry, and no new tradeline. Your balance drops, which if anything helps. It is one of the few moves in this business with no credit cost attached.

Can I recast more than once?

Many servicers allow it, sometimes with a limit over the life of the loan. Worth confirming if you expect a second windfall, because that changes whether you should deploy all of it now.

Ron Berg

I am a San Diego–based mortgage lender licensed in California, Nevada, Arizona, and Maryland. I spend most of my week on the unglamorous question of whether a transaction is actually worth doing. Find me on Instagram or Facebook, or run your equity review here.

Ron Berg, NMLS #974839. C2 Financial Corporation, NMLS #135622, CA DRE #01821025. Licensed in CA, NV, AZ, and MD. Recast availability, minimum curtailments, and fees are set by your loan servicer and by investor guidelines, and are subject to change — confirm yours directly. Rates and payments shown are illustrative and based on the Freddie Mac Primary Mortgage Market Survey average of 6.66% as of 8/27/2026; they are not a quote, a commitment to lend, or an offer of credit. This is not tax or investment advice. Equal Housing Opportunity.