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Call five servicers and ask what the minimum lump sum to recast a mortgage is, and you will get five different numbers. The most common answer is $10,000, but I have seen $5,000 at smaller lenders and $25,000 at a few strict ones. The number matters less than people think, though, because the real question is whether your lump sum is big enough to move the payment in a way you can feel. Here is the range, the rules around it, and the math on what different lump sums actually buy you.
There is no federal minimum. Fannie Mae and Freddie Mac, which back most recast-eligible conventional loans, let the servicer set the terms. In practice, $10,000 is the modal requirement. Several large servicers publish it outright: a single $10,000 principal payment, or multiple principal reductions that total $10,000 within about three months of the request. Smaller banks and credit unions often go lower, sometimes $5,000, because they keep the loan on their own books and make their own rules.
The minimum is only one gate. The loan has to be current, it has to be a first lien, and most servicers will not recast an FHA, VA, or USDA loan at all. Some investors allow only one recast per 12 months. And there is a processing fee on top, usually $150 to $500, which is worth subtracting from your expected savings before you decide anything.
Ask two questions, not one. "What is your minimum lump sum?" and "What is your recast fee?" A $5,000 minimum with a $500 fee is a worse deal than a $10,000 minimum with a $150 fee if you were going to put $10,000 in anyway. I covered lender-by-lender fee differences in what lenders charge to recast.
Take a $400,000 balance at 6.5 percent with 25 years left. The principal and interest payment is about $2,528 a month. Recast it after a $10,000 lump sum and the payment drops to about $2,465. That is $63 a month, or roughly $19,000 in lower payments over the remaining term. Real money, but not life changing.
Now put in $50,000 instead. The payment falls to about $2,212, a $316 monthly drop. That is the difference people actually notice. It is also roughly the point where recasting starts to compete with refinancing on payment relief alone, which is the comparison I ran in recast vs refinance.
| Lump sum | New payment | Monthly drop | My read |
|---|---|---|---|
| $10,000 (common minimum) | ~$2,465 | ~$63 | Worth doing, barely felt |
| $25,000 | ~$2,369 | ~$159 | Noticeable breathing room |
| $50,000 | ~$2,212 | ~$316 | Changes the budget |
A useful rule of thumb falls out of the arithmetic: on a 6 to 7 percent loan, every $10,000 you put in cuts the payment by roughly $60 to $70 a month. Scale your expectations from there before you call the servicer.
This is the mistake I worry about most. Someone gets a $12,000 bonus, the servicer requires $10,000, and they ship the whole thing to principal to qualify, leaving $2,000 in savings. The payment drops $63 a month. Six months later the furnace dies and the $63 a month does not cover a $9,000 repair.
My decision rule: keep at least three months of expenses liquid after the lump sum, or skip the recast. The minimum is a servicer convenience, not a financial target. If hitting it leaves you cash poor, you are trading resilience for $63 a month, which is a bad trade by any honest accounting. Extra principal payments without a recast have no minimum at all, so the money still works for you if you just apply it and keep the payment where it is. That tradeoff is the whole subject of recast vs extra principal payments.
The flip side: if you are sitting on a large cash position well past your emergency fund, like an inheritance or a home sale profit, the minimum is irrelevant and the only question is recast vs refinance vs invest. At that point run the numbers in the recast calculator rather than anchoring on whatever the servicer requires.
Most servicers require $10,000, either as one payment or as multiple principal reductions totaling $10,000 within about three months. Some lenders require as little as $5,000 and a few as much as $25,000. There is no federal minimum; the servicer sets it.
Usually yes. Recast processing fees typically run $150 to $500 depending on the lender. Subtract the fee from your expected savings when you evaluate whether the recast is worth it.
At many servicers, yes. Several large servicers accept multiple principal reductions that total at least $10,000 within a three month window starting from the recast request. Confirm the window with your own servicer before you start, since the policy varies.
On a $400,000 balance at 6.5 percent with 25 years left, about $63 a month. A rough rule: at 6 to 7 percent rates, each $10,000 of lump sum cuts the monthly payment by roughly $60 to $70.
Generally no. Recasts are a conventional loan feature, mainly for Fannie Mae and Freddie Mac backed mortgages. FHA, VA, and USDA loans are typically excluded by servicer policy. I covered the details in can you recast an FHA or VA mortgage.