Mortgage Recasting: The Hidden Alternative to Refinancing
Executive Summary
"Lump sum payments can lower your monthly obligation without changing your interest rate. Learn the math of a recast — and how it differs from a refinance."
Recasting is one of the least-advertised tools in the mortgage industry — probably because it earns the lender almost nothing. Unlike refinancing, which replaces your entire loan with a new one, a recast simply re-amortizes your existing loan around a lower balance. Same rate, same lender, same maturity date. Just a smaller number to divide by.
Recast vs. Refinance: Different Tools for Different Jobs
A refinance closes out your current mortgage and opens a brand-new one, usually to chase a lower interest rate or change the loan term. That means a new credit pull, a new appraisal, new title work, and closing costs that commonly run 2-5% of the loan amount. A recast changes none of that. Your interest rate, loan type, and payoff date stay exactly as they were — you're just telling the servicer "apply this lump sum to principal, then recalculate my payment as if I'd started with this smaller balance."
The practical effect: your monthly payment drops, but your interest rate does not. If rates have fallen since you took out your loan, a refinance is usually the better move. If rates have risen — or you simply want to keep your current rate and free up monthly cash flow — a recast lets you do that without touching the rate at all.
The Qualifying Rules
Not every loan can be recast. Conventional loans (the kind backed by Fannie Mae or Freddie Mac) generally allow it, and most servicers require a minimum lump-sum payment — commonly somewhere in the $5,000-$10,000 range, though this varies by lender — plus a one-time administrative fee, typically a few hundred dollars. FHA and VA loans, by contrast, typically do not offer recasting at all; those programs are built around a different set of servicing rules. If you have a government-backed loan, check with your servicer directly rather than assuming the option exists.
Worked Example
Say you have a $320,000 balance at 6.25% with 27 years remaining, and you receive a $40,000 windfall. Applying it as a recast leaves a $280,000 balance re-amortized over the same 27 years, at the same 6.25% rate.
Your monthly principal-and-interest payment drops by roughly the same proportion as your balance did — in this illustration, a payment cut in the neighborhood of 12%, for a one-time fee that's often under $500. Compare that to a refinance, where closing costs on a $280,000 loan could easily run $6,000-$10,000.
How to Actually Request One
Call your loan servicer (not the originating lender, if the loan has been sold — most mortgages are sold to a servicer shortly after closing) and ask specifically for a "loan recast" or "re-amortization." Confirm three things up front: the minimum lump-sum amount required, the recast fee, and processing time (often 4-8 weeks). Send the lump sum with clear written instructions that it's for a recast, not a general extra-principal payment — sent the wrong way, it just shortens your loan term instead of lowering your payment, which is a fine outcome but a different one.
Recasting won't save you interest the way steady extra principal payments do over the life of the loan, since your term doesn't shrink — it's a cash-flow tool, not an interest-minimization tool. If your real goal is paying less interest overall, run both paths through the numbers first.
Model an Extra-Payment Payoff Instead →Compare Recast vs. Refi Break-Even →Calculated an impact?
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