Jumbo Mortgage Recast Calculator
Payment breakdown
Interest & break-even
Total monthly housing cost
Where your money goes over time
If the freed-up cash is invested at 7%, the saved payments grow to about $0 by payoff.
Four ways to use that cash
| Scenario | Monthly P&I | Interest left | Payoff | What happens |
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Show the full amortization schedule (before vs after)
| # | Int. now | Prin. now | Bal. now | Int. recast | Prin. recast | Bal. recast |
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How to use this calculator
- Enter your current loan balance, interest rate, and remaining term.
- Enter the lump-sum amount you plan to pay toward principal.
- Click Calculate to see your new payment, interest savings, and comparison.
About this tool
Have a large loan and a large lump sum? Estimate your new payment and interest saved after recasting a jumbo mortgage — and understand why jumbo eligibility works differently from conforming loans.
On a jumbo loan, a recast can move real money — because the balances are large, even a modest rate applied to a smaller principal translates into a meaningful monthly reduction. The math is identical to any recast: apply a lump sum, and the servicer re-amortizes the lower balance over your remaining term at the same rate. What's different with jumbo loans is whether you're allowed to recast at all.
Why jumbo recasting is investor-dependent
Conforming loans follow Fannie Mae and Freddie Mac servicing guides, which include a standard recast pathway. Jumbo loans exceed those limits, so they're held on banks' own books or sold to private investors — each with its own rulebook. That means recast availability, minimums and fees vary widely from one jumbo servicer to the next, and even between two jumbo loans at the same bank if they sit in different investor pools. The only reliable answer comes from your specific servicer.
Bigger balances, percentage-based minimums
Where a conforming loan might set a flat $5,000–$10,000 minimum, jumbo servicers often express the minimum as a percentage of the unpaid balance — commonly around 10%. On a $900,000 loan that's a large curtailment, so plan the lump sum with the percentage rule in mind. Fees, by contrast, are usually still a modest flat administrative charge.
If your jumbo loan can't be recast
You keep the same fallbacks as any borrower: a one-time extra principal payment shortens the term and cuts interest (without lowering the required payment), and a refinance can reset the rate if the market has moved. For eligibility across loan types, see which loans can be recast; to weigh recasting against investing a large sum, see recast or invest.
Jumbo recast — FAQ
Can you recast a jumbo mortgage?
Sometimes. Jumbo loans are held by banks and private investors rather than Fannie Mae or Freddie Mac, so each servicer sets its own rules. Some portfolio lenders recast jumbo loans; others don't. Ask your servicer.
Why is jumbo recast eligibility different?
Because jumbo loans exceed conforming limits, they aren't backed by the usual agencies. There's no single standard, so recast availability depends entirely on the investor holding your loan.
Is the jumbo recast minimum higher?
Often. On large balances, servicers frequently set the minimum as a percentage of the balance (for example 10%), which can be a substantial sum, rather than a flat $5,000–$10,000.
Does a jumbo recast change my rate?
No. Like any recast, it keeps your interest rate and term and only recalculates the payment on the reduced balance.
What if my jumbo loan can't be recast?
Apply the lump sum as an extra principal payment to cut interest and term, or explore refinancing if rates have moved in your favor.