Refinancing: Finding the Break-Even Point

Rate drops get all the attention. The two things that actually decide whether a refinance pays are how long you keep the loan and how long the new term runs. Neither appears in the headline.

The break-even calculation itself

Take your current monthly payment, subtract the new one, then divide the closing costs by the difference. That is the number of months before you are ahead. Costs of $5,800 against a saving of $257 gives 22.6, so call it 23 months. If there is any real chance you move or repay inside two years, the refinance is a loss and no rate cut changes that.

What belongs in the cost figure

Origination or arrangement fee, appraisal or valuation, title work, recording, and any points you buy. In the UK a remortgage product fee is often around £999 and can usually be added to the loan, which is not the same as free: carried on a 25 year mortgage at 5 per cent that £999 costs about £1,750 by the end. Add up everything you pay to get from the old loan to the new one.

Resetting the clock is the expensive part

Here is the case people miss. A $300,000 loan at 7 per cent over 30 years costs $1,996 a month. Over the full term that is $718,560, of which $418,560 is interest.

Three years in, the balance is about $290,000. Refinance that at 6 per cent over a fresh 30 years and the payment falls to $1,739, a saving of $257 a month. Multiply by 360 months and you get $92,520, which is what a rate comparison implies.

The real number is much smaller. You have already made 36 payments of $1,996, which is $71,856, and you now face 360 payments of $1,739, which is $626,040. Total outlay across both loans is $697,896 against $718,560. The saving is $20,664, and you spent $5,800 to get it. Worth doing, but about a fifth of what the monthly figure hinted at, because you swapped 27 remaining years for 30 new ones.

Keeping your original payoff date

Two ways round it. Refinance into a shorter term, 25 years rather than 30, so the finish line does not move. Or take the 30 year loan for the flexibility and keep paying the old $1,996 anyway. That second one is what I would do: the extra $257 goes straight at principal, the loan clears years early, and you can stop any month you need the cash. Our note on reading an amortization schedule shows where that payment lands.

How to use the refinance calculator

Enter the current balance, current rate, and months remaining, then the new rate, new term, and total closing costs. The output gives the new payment, the monthly saving, the break-even month, and the change in lifetime interest. Read that last line first, because it is the only one that accounts for the term reset.

Finding your current numbers

Your latest mortgage statement has all three: the outstanding principal (not the original loan amount), the current rate, and the payoff date. Count the months to that date rather than assuming the term is still what the loan started as. Compare principal and interest only, since taxes and insurance escrow do not change with a refinance and folding them in makes the saving look smaller. On timing, when to refinance a mortgage covers the conditions worth waiting for.

Common questions

How far does the rate have to drop to be worth it? The old rule of thumb was a full percentage point, but the honest answer is whatever clears break-even inside the time you plan to keep the house. On a large balance, half a point can pay back in under two years. On a small balance, a full point may never.

Is a no-cost refinance really free? No. The lender either charges a higher rate for the life of the loan, or folds the costs into the balance so you pay interest on them for 30 years. It can still be right if you expect to move soon, because there is nothing to recoup.

Does refinancing hurt my credit score? Slightly and briefly. There is a hard search, and a new account replaces an older one, which shortens your average account age. Rate shopping inside a short window normally counts as a single search.

Can I roll the closing costs into the new loan? Usually, and it is convenient, but it raises the balance and the payment, pushing break-even further out. Run the calculator both ways before deciding.