Financial term · Reviewed August 17, 2026
Recast
Recast: Recalculating a loan payment after a lump-sum principal reduction, keeping the original term. It lowers the payment where prepaying alone would shorten the term instead. The Mortgage Recast Calculator returns this figure from recast payment amortizes the balance after a lump-sum principal reduction over the remaining term. At that calculator’s documented worked-example inputs the new monthly payment is $1,825; holding every other input steady, moving interest rate from 4.5% to 8.5% moves it from $1,502 to $2,177, a spread of $674.
A recast recalculates the payment after a lump-sum principal reduction while keeping the original end date. That is the option to reach for when cash flow is the problem instead of total interest, and it is the only one of prepay, recast and refinance that lowers the payment without resetting the term or paying closing costs.
| Term | Recast |
|---|---|
| Category | Mortgage & Home |
| How it is found | Recast payment amortizes the balance after a lump-sum principal reduction over the remaining term |
| Worked example | New monthly payment: $1,825 |
| Computed by | Mortgage Recast Calculator |
| Related terms | 8 defined in this glossary |
Before you rely on it
What to check
Ask the servicer whether they offer it, what lump sum it requires, and what it charges.
The common error
Where people go wrong with recast
Assuming a large extra payment automatically lowers the monthly amount. Prepaying shortens the term and leaves the payment alone; only a recast moves the payment, and it usually has to be requested.
Worked through
Recast in plain numbers
A homeowner owes $300,000 at 6% with 25 years left, so the payment is about $1,933. They receive a $50,000 windfall and make it as a lump-sum payment; a recast re-amortizes the remaining $250,000 over the same 25 years at the same 6%; the new payment is about $1,611, a drop of roughly $322 a month. The rate and the payoff date did not change. Compare it with putting the $50,000 toward principal without recasting: the payment would stay at $1,933, and the loan would be repaid years sooner. Recasting suits someone who wants lower monthly costs. Not recasting suits someone who wants to finish faster.
Easily confused
Recast and its neighbours
A recast is not a refinance. A refinance replaces the loan with a new one, with a new rate, closing costs and a fresh qualification. A recast keeps the same loan and only recalculates the payment after a large principal reduction, usually for a small fee; it also differs from making extra payments without recasting, where the payment stays the same and the term shortens. Not every loan allows a recast. Government-backed loans may not, and lenders set minimum lump sums; ask whether your servicer offers it and what the conditions are.
In real decisions
Where recast turns up
People recast after selling a previous home and using the proceeds, after inheritances or bonuses, or when they want to lower payments without giving up a low rate; it is common when someone buys before selling and later applies the sale proceeds; retirees use it to reduce fixed costs. A calculator shows the new payment and the interest saved. Comparing it with the other choices, such as investing the money or paying down higher-rate debt, shows whether it is the best use of the cash.
Know the edges
Where recast stops being reliable
The interest saved is smaller than from a shorter term; a recast does not change the rate, so it is unattractive if you could refinance to a lower one. Fees and minimums apply. You lose liquidity because the money is now in the house. Confirm eligibility and costs with your servicer, and check that the recast does not conflict with other loan terms.
Quick answers
What people ask about recast
How much does a recast cost? Servicers often charge a modest fee, in the low hundreds of dollars, and require a minimum lump sum. Ask for the fee schedule.
Will a recast change my interest rate? No. The rate and the maturity date stay the same. Only the monthly payment is recalculated.
Put it to work
How recast is calculated
At the mortgage recast calculator’s worked-example inputs, new monthly payment is $1,825, monthly payment reduction is $336. Moving interest rate from 4.5% to 8.5% moves that first figure from $1,502 to $2,177.
Open the Mortgage Recast Calculator →
Loan programs, insurance, property costs and underwriting rules vary by lender and location.
Related vocabulary
Terms used alongside this one
Keep reading
Nearby in the glossary
- ← Rebalancing
- Refinance →
- All 174 defined termsThe complete Free Calculators Online financial glossary.