Resetting a $350,000 Mortgage to 30 Years With 15 Years Left
You are halfway through the loan and the offer restarts it. See what doubling the remaining term does, even with a better rate attached.
Current loan balance $350,000 · Current interest rate 7% · Years left on current loan 15 years · +3 moreYour figuresEdit figures
What you still owe today
The rate you pay now
Years still to run
The rate you are offered
Years the new loan runs
Fees to complete the refinance
Break-even point
You earn the closing costs back in 7 months, but the longer term means you pay more interest over the life of the loan.
Breaks even in 7 months, but lifetime interest rises.
- Break-even point
- 7 months
- Monthly saving
- $1,047
- Lifetime interest saved
- -$189,172
- Saving after closing costs
- -$195,672
Over the years each loan still has to run, refinancing costs $195,672 MORE once the $6,500 of closing costs is counted — whatever the monthly payment does.
| Scenario | Keep current loanBetter | Refinance |
|---|---|---|
| Years still to pay | 15 | 30 |
| Monthly payment | $3,146 | $2,098 |
| Interest over those years | $216,262 | $405,434 |
| Closing costs | $0 | $6,500 |
| Interest + closing costs | $216,262 | $411,934 |
Method: Standard fixed-rate amortization, compared scenario against scenario
- Both loans are fixed rate with monthly compounding, and neither rate ever changes.
- The new loan equals your current balance: no cash taken out, and closing costs paid at settlement rather than rolled in.
- Property tax, hazard insurance and mortgage insurance are excluded, and no early payoff or missed payment is modelled.
- No tax table is used. Figures are estimates for comparison, not a lender quote or tax advice.
No tax rates are used in this calculation.
This is an estimate, not financial or tax advice. Confirm figures with the linked source or a licensed professional before acting on them.
Halfway through is where the reset costs the most
With fifteen years left on a thirty-year loan you are at the midpoint, and the midpoint is where a term reset does the most damage. You have already paid the expensive half. The years behind you were the ones where nearly every dollar went to interest; the years ahead were the ones where the composition finally tilts and the balance starts falling quickly. Accepting a fresh thirty-year term hands back exactly that reward and asks you to earn it again, from the beginning, on the same debt.
The monthly relief will look substantial, and it is worth being clear about where nearly all of it comes from. Three hundred and fifty thousand dollars over fifteen years is a demanding payment. The same balance over thirty years is not. Doubling the number of instalments is doing most of the work, and the rate improvement is a modest contributor sitting on top of it. This is why the lifetime interest figure in the result moves so decisively in the wrong direction here: fifteen extra years of accrual on a balance this size is a very large amount of interest, and a one-point rate cut does not come close to offsetting it.
The right way to hold this is not that the offer is bad but that it is a different product than it appears. It is not a cheaper version of your mortgage. It is a new mortgage, roughly twice as long, at a better rate, and it should be evaluated as one. Ask yourself whether you would sign this loan today if you were starting fresh. If the answer is no, the fact that you already owe the money does not make it a better idea.
If cash flow is the actual problem — and sometimes it genuinely is — the reset can be the correct answer, and there is no shame in choosing it deliberately. What matters is that the result above be read in full before you sign, so that the choice is made with the lifetime figure in view rather than discovered a decade later.
Alternatives that get the cash flow without the reset
Before accepting a doubled term, price the intermediate ones. A twenty-year term at the new rate still lengthens the loan, but by five years rather than fifteen, and it captures most of the payment relief while leaving the lifetime figure far closer to where it was. The calculator above takes any term you like; running twenty, twenty-two and twenty-five in turn takes a couple of minutes and usually reveals that the relief curve flattens well before thirty years, meaning the last decade of extension buys very little payment reduction for a great deal of interest.
It is also worth checking whether a refinance is the right instrument at all. If the goal is short-term breathing room rather than a permanent change, a lender may offer a recast — a re-amortisation of the existing loan after a lump-sum principal payment — which lowers the payment without resetting the rate, the term or the accumulated position. Not every servicer offers it and it usually requires cash up front, but it costs a fraction of a refinance and leaves the clock alone. Ask before assuming a refinance is the only tool available.
Finally, if you do take the thirty-year term, nothing obliges you to pay it on the thirty-year schedule. Paying the new loan at something close to your old payment amount uses the better rate while keeping the payoff date roughly intact, and preserves the option to fall back to the lower required payment in a bad month. That optionality is genuinely valuable, and it is the strongest honest argument for the longer term — but it only works if you actually make the higher payments.
What closing costs include
The closing cost figure you enter should be everything you pay to get the new loan, whether it comes out of your pocket at settlement or is added to the balance. Typical components are the lender's origination or underwriting fee, discount points if you bought the rate down, an appraisal, a credit report, title search and title insurance, settlement or attorney fees, recording fees and any state or local transfer tax that applies to a refinance. On a mid-size loan the total commonly lands somewhere between two and five percent of the amount refinanced, which is why the break-even is measured in years rather than months.
Two items deserve care. A no-closing-cost refinance is not free — the fees are paid through a higher rate instead, so enter zero costs and the higher rate you were actually quoted, and compare that against the version with costs and the lower rate. And rolling the fees into the balance does not remove them either; it borrows them at the mortgage rate for the whole term. This calculator assumes the costs are paid at settlement and the new loan equals your current balance, so that the break-even figure is attributable to one thing at a time.
Prepaid interest, escrow deposits for taxes and insurance, and any refund of your old escrow account are transfers of timing rather than costs of the refinance, and are best left out of the number you enter here.
How to read your result
The headline is the number of whole months before the accumulated saving equals the closing costs, rounded up, because a partial month has not finished paying anything back. Compare it against your own horizon first. If you expect to keep the loan comfortably longer than the break-even, the refinance is doing what it is supposed to. If the two numbers are close, the decision is much finer than the rate difference makes it look, and small differences in the fee quote will decide it.
Beneath the headline, the monthly saving tells you how quickly the clock runs, and the two interest figures tell you what the whole loan costs under each scenario. If the lifetime interest saved is negative, read that as the price of the lower payment rather than as a reason to stop, and decide whether the cash flow is worth it.
Every figure here is an estimate from the six values you entered. It assumes a fixed rate on both loans, no cash taken out, no change to property tax, hazard insurance or mortgage insurance, and no early payoff. A lender's own quote will differ where any of those assumptions differ, and it is the written offer that governs. Change any input and the page recalculates immediately with no reload, and the link at the top of the result carries your scenario so you can send it to someone else and have them open the same numbers.
Frequently asked questions
Is it always a mistake to reset a mortgage to thirty years?
No, but it should be a deliberate choice rather than a side effect. Resetting converts future interest into present cash flow, which is a reasonable trade when the current payment is straining the household, when the freed money goes somewhere that reliably earns more than the mortgage rate, or when you value the option of a lower required payment in a bad month. It becomes a mistake when it is accepted purely because the monthly figure looked better on a summary sheet.
What is a mortgage recast and would it help here?
A recast re-amortises your existing loan after you make a lump-sum principal payment, lowering the required monthly payment while leaving the rate, the term and your accumulated position untouched. It typically costs a small administrative fee rather than a full set of closing costs. It requires cash up front and not every servicer offers it, but when the goal is payment relief rather than a better rate, it is often the cheaper instrument and it does not restart the clock.
How is the refinance break-even point calculated?
Divide the total closing costs by the monthly saving, where the saving is your current principal and interest payment minus the payment on the proposed loan. The result is the number of months of lower payments needed before the accumulated saving equals what the refinance cost. This page rounds up to a whole month, because a partial month has not finished paying anything back, and it ignores what you could have earned on the fees had you invested them instead.
What if my monthly payment does not go down at all?
Then there is no break-even point, and this calculator says so in words instead of printing a zero or a negative month count. It usually happens when the new term is shorter than the years you have left, so the balance is compressed into fewer payments, or when the rate improvement is too small to offset that compression. A shorter term is not necessarily a bad deal, but it is not a cash-flow saving, so break-even is the wrong test for it.
Why can a lower payment still cost me more in the end?
Because resetting the term adds years of interest. Interest accrues on the outstanding balance every month it stays outstanding, so replacing twenty-two remaining years with a fresh thirty-year loan adds eight more years of it. That addition often exceeds everything the lower rate saved. The result on this page shows the interest under each scenario separately and the difference as a signed figure, so a negative saving is visible rather than hidden behind a smaller monthly number.
Should I include the closing costs if they are rolled into the loan?
Yes, enter them as closing costs. Rolling the fees into the balance does not make them disappear; it borrows them at the mortgage rate for the whole term, which costs more than paying them at settlement, not less. This calculator assumes the new loan equals your current balance and the costs are paid up front, so that the break-even figure can be attributed to one variable at a time. Treat a rolled-in quote as slightly optimistic here.
Is a no-closing-cost refinance a better deal?
It is the same deal priced differently. The lender covers the fees and recovers them through a higher interest rate over the life of the loan, so your break-even is immediate but your monthly saving is smaller and your lifetime interest is higher. Run the calculation both ways: once with zero costs at the higher quoted rate, once with the real costs at the lower rate, and compare the lifetime interest figures over the years you actually expect to stay.
How long do I need to stay for a refinance to be worth it?
Longer than the break-even point, with room to spare. If the calculation says thirty-one months and you might move in three years, the margin is too thin to be worth the disruption, since a sale or another refinance stops the clock and any unrealised months of saving simply never happen. As a rule of thumb, look for a break-even comfortably shorter than half the time you confidently expect to keep both the house and the loan.