What mortgage recasting actually is
A mortgage recast (sometimes called re-amortization) is the lender’s process of recalculating your monthly payment based on a new, lower loan balance while keeping your existing rate, remaining term, and loan structure. You pay a one-time lump sum to principal, the lender charges a small fee ($150-500), and your monthly payment drops. That’s it. No credit pull, no appraisal, no underwriting, no closing costs.
This is dramatically different from refinancing, where you’re replacing your entire loan with a new one (new rate, new term, new $5,000-$15,000 in closing costs). Recasting is simpler, cheaper, and — in the current rate environment — often the right move when refinancing doesn’t make sense.
When recasting beats principal-only payment
Here’s where it gets interesting. If you have an extra $50,000 and a 3.25% mortgage, you have three options:
1. Principal-only payment (no recast): Apply $50,000 to principal. Your payment stays the same. You pay off the loan 4-6 years early. Lifetime interest saved: ~$57,000 on a $340K balance with 25 years remaining.
2. Recast: Apply $50,000 to principal + $250 recast fee. Your payment drops by ~$250/month. Loan still pays off on original 25-year schedule. Lifetime interest saved: ~$37,000.
3. Refinance: Apply $50,000 to closing costs of a new 25-year loan. Rate might be 6.5% (higher than your current 3.25%). Payment goes up dramatically. Bad move.
Option 1 saves the most interest — but ties up $50,000 in home equity you can’t easily access. Option 2 saves less interest but gives you ongoing cash flow relief. The right choice depends on your goals.
When recast is the right call
Cash flow relief matters more than total interest: You want lower fixed monthly obligations (retirement planning, income reduction, moving to single income). The $250/month freed up is useful even though you’re “leaving $20K on the table” in interest savings.
You have a great rate you want to keep: Pre-2022 buyers with 2.5-3.5% rates cannot replicate these rates today. Refinancing is impossible. Recast preserves the rate while reducing balance.
You received a windfall: Inheritance, sold a business, big bonus, stock sale, sold investment property. Recast converts one-time liquidity into permanent monthly cash flow.
You’re a few years from retirement: Dropping your mortgage payment materially lowers required retirement savings. A $300/month payment drop means $90,000 less needed at a 4% withdrawal rate.
You want cash flow without losing disciplined paydown: Recasting still reduces your total interest cost, just less than principal-only. You capture some of both benefits.
When to do principal-only payment instead
You want to pay off the loan as fast as possible: Principal-only + keeping the higher payment shaves years off the loan. Recast doesn’t.
You have high income stability: You can comfortably keep paying current payment. Putting all extra cash toward principal-only builds equity fastest.
Every dollar of interest saved matters: Debt-averse people going for lifetime interest minimization prefer principal-only.
Recast requirements and limits
Loan type: Most conventional conforming loans can recast. FHA, VA, and USDA loans typically cannot (they require a full refinance to reduce payment). Jumbo loans usually can, depending on servicer.
Minimum lump sum: Most servicers require $5,000-$10,000 minimum. Some larger (e.g., Wells Fargo at $20,000 minimum on some loans). Check your specific servicer.
Waiting period: Many servicers require at least 90 days of on-time payments since origination before recasting. Some have a 6-month or 1-year waiting period.
Payment history required: Current on payments. Some servicers require 12 months of on-time history.
Fee: $150-$500 typical. Much less than the $3,000-$10,000 of refinance closing costs.
Cannot change rate or term: Recast only changes the monthly payment via principal reduction. To change rate or term, you need a full refinance.
The math of why recast has a specific sweet spot
The recast calculator lets you compare three paths. There’s a rule of thumb that helps decide.
Lump sum <15% of balance: Principal-only is usually better. The monthly payment reduction from recasting a small lump isn’t enough to justify the recast fee vs just applying to principal.
Lump sum 15-30% of balance: Recast often preferred. Monthly relief is meaningful; interest savings still substantial.
Lump sum >30% of balance: Consider payoff. If you can pay off the whole mortgage, do it. If not, recast dramatically reduces your monthly obligation.
Sneaky details most guides miss
Your escrow resets: If you have an escrow account, your monthly payment reduction includes property tax and insurance only if those haven’t changed. Rate and term don’t change, but escrow pass-through usually adjusts separately at annual escrow review.
Recast doesn’t remove PMI: Even if your recast drops LTV below 80%, PMI doesn’t auto-remove. You have to request removal separately (and may need an appraisal).
Biweekly payments still work: After recasting, you can still do biweekly extra payments and chip away at the balance further.
Multiple recasts: Most servicers allow multiple recasts over the life of a loan, though usually no more than one per 12 months.
Related calculators
- Mortgage payoff — target a specific payoff year.
- Extra payment impact — principal-only paydown.
- Refinance break-even — should you refi instead?
- PMI removal — drop PMI after recast.