Recast Scenarios
Real-world examples showing how a principal lump sum changes your monthly payment and total interest.
The Inheritance: A $50,000 Lump Sum
Sarah owes $345,000 on her mortgage at 6.25% with 25 years remaining. She receives a $50,000 inheritance and puts it toward her principal. Her monthly payment drops from $2,276 to $1,946, saving her $330 per month. Over the remaining term, she saves $48,950 in interest that would have accrued on that $50,000. She keeps her 6.25% rate, avoids closing costs, and permanently lowers her required payment.
Old Payment
$2,276
New Payment
$1,946
Monthly Savings
$330
Interest Saved
$48,950
The Bonus: A $20,000 Lump Sum on a Larger Loan
Mark owes $500,000 at 7% with 28 years remaining. He receives a $20,000 year-end bonus and applies it to his principal. His payment drops from $3,398 to $3,262, saving $136 per month. While the monthly savings are modest, the lifetime interest savings are $25,670 because the $20,000 reduction compounds across 28 remaining years. The percentage savings per dollar of lump sum is highest on high-rate loans with long remaining terms.
Old Payment
$3,398
New Payment
$3,262
Monthly Savings
$136
Interest Saved
$25,670
The Rate Lock: Recast vs. Refinance at 3.25%
David owes $280,000 at 3.25% with 22 years remaining. He wants to lower his payment and has $75,000 from selling a rental property. If he recasts, his payment drops from $1,486 to $1,088, saving $398 per month while keeping his 3.25% rate. If he refinanced the full balance at 6.5% over the same term, his new payment would jump to $1,996. Recasting preserves his below-market rate and permanently lowers his monthly obligation by $398.
Old Payment
$1,486
Recast Payment
$1,088
Refi at 6.5%
$1,996
Monthly Savings
$398
Run Your Own Numbers
Enter your loan balance, rate, term, and lump sum in the recast calculator to see your exact savings.
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