MortgagesLetter M

Mortgage Recast (Re-Amortization)

A loan modification procedure where a homeowner makes a lump-sum principal payment and the lender re-amortizes the reduced balance over the remaining loan term to lower the monthly payment while keeping the existing interest rate.

Overview & Practical Application

A Mortgage Recast (also called Loan Re-Amortization) allows a homeowner who makes a substantial lump-sum principal curtailment (typically $10,000 or more, such as proceeds from selling a previous home, an inheritance, or an annual bonus) to permanently reduce their required monthly principal and interest payment without refinancing.

Normally, if you make an extra lump-sum payment on a fixed-rate mortgage, your loan pays off years earlier, but your required monthly payment remains identical. When you request a Mortgage Recast: 1. Interest Rate Preserved: Your original note rate (e.g., a low 3.25% or 4.50% rate) remains 100% unchanged. 2. Remaining Term Preserved: If you have 26 years (312 months) left on your loan, the new payment is re-amortized over those exact 312 remaining months. 3. Minimal Administrative Fee: Requires zero credit check, zero property appraisal, and zero closing costs โ€” only a flat servicer administrative fee of $150 to $500.

30-Year Amortization: Principal vs. Interest Over TimeInterest Paid (%/mo)Principal Paid (%/mo)Year 1Year 15 (Crossover)Year 30Early payments are 80%+ interest; principal accelerates in years 16-30.
Visual Infographic: Mortgage Recast (Re-Amortization)

Mathematical Formula & Calculation

New Monthly Payment = (P_new * r * (1 + r)^n_rem) / ((1 + r)^n_rem - 1)

Re-computes the standard monthly amortization payment using the post-lump-sum principal balance over the remaining months at the original note rate.

Variable Definitions:

  • P_new=Current Principal Balance minus Lump-Sum Principal Reduction
  • r=Existing Monthly Interest Rate (Original Annual Rate / 12)
  • n_rem=Remaining number of monthly payments on the existing loan schedule
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Interactive Financial Calculator

Test real-world numbers and see instant underwriting results.

New Recast Monthly Payment$1,779.33/mo
Permanent Monthly Payment Drop-$474.48/mo
โœ… Recast keeps your 5.50% rate on $300,000 remaining principal without refinancing closing costs.

Real-World Underwriting Example

Scenario: You have $380,000 remaining on a mortgage at 5.50% with 324 months left ($2,253.81/mo). After selling another asset, you apply a $80,000 lump sum and pay a $250 recast fee.

Calculation:
New Principal (P_new) = $380,000 - $80,000 = $300,000.
Re-amortized over 324 months at 5.50% = $1,779.33/month.

Takeaway: Your required monthly payment drops permanently by $474.48/month for a flat $250 fee without losing your 5.50% interest rate.

Key Underwriting Takeaways

  • Superior to refinancing whenever current market interest rates are higher than your existing mortgage rate.
  • Widely used by "buy-before-you-sell" homeowners who close on a new home with a small down payment and then recast the loan once their previous home sells.
  • Permitted on most conventional Fannie Mae and Freddie Mac loans, though FHA and VA loans generally do not allow recasting.

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