Should You Refinance Your Mortgage?

Refinancing replaces your mortgage with a new one, ideally at a lower rate. The usual test offered is the break-even point — how long the monthly saving takes to repay the closing costs — and it is the right test for the wrong question. A refinance can pass it comfortably and still cost you more than doing nothing, which is what the worked example below shows.

What actually happens

You take out a new loan, use it to repay the old one, and start again on new terms. Because it is a new mortgage it carries closing costs of roughly 2–5% of the balance, and unless you deliberately choose otherwise, it restarts the amortisation schedule — which matters more than most borrowers expect, because early payments are mostly interest.

The worked example that changes the answer

Take a $300,000 balance at 7.25% with 25 years remaining, so a payment of $2,168 and about $350,500 of interest still to come. Rates have fallen to 6.25% and closing costs are $6,000. Two versions of the same refinance:

• Into a fresh 30-year term — payment $1,847, saving $321 a month, break-even in 19 months. Total interest $364,975.
• Into a 25-year term, matching what was left — payment $1,979, saving $189 a month, break-even in 32 months. Total interest $293,702.

The first option looks better by every measure people usually check: bigger monthly saving, faster break-even. It also costs about $14,400 more in total interest than never refinancing at all, because five extra years of payments outweigh the lower rate.

The second option looks worse on both headline numbers and saves about $56,800 over the life of the loan. The break-even test cannot see this, because it only measures how quickly you recover the fees — not what you signed up for afterwards.

How to test it properly

Ask two questions, in this order. First: does the new loan reduce total remaining interest? Compare interest still to be paid on the current loan against total interest on the new one, not payment against payment. Second: will you hold the loan past the break-even month? A refinance that passes the first test and fails the second is a loss, and one that fails the first is a loss regardless of how long you stay.

The simplest way to keep the first test honest is to refinance into a term no longer than what remains. If the goal is a lower payment rather than a lower cost, that is a legitimate choice — but it should be made deliberately, knowing the price.

Good reasons to refinance

• The rate has fallen meaningfully. The old rule of thumb is 0.5–1%, though what matters is the arithmetic above, not the threshold.
• Your credit has improved enough to reprice the loan — a hundred points of score is often half a percentage point.
• You want a shorter term and can afford the payment, converting a rate drop into a payoff date rather than into cash flow.
• You are leaving an adjustable-rate loan before it adjusts, buying certainty rather than a saving.
• You are removing mortgage insurance that will not fall off on its own, which is the usual case with FHA loans.

A weaker reason is a lower payment for its own sake when money is tight. It works, and it is sometimes necessary, but recognise it as restructuring rather than saving — you are buying breathing room with interest.

Costs, and the “no-cost” version

Closing costs cover origination, appraisal, title and recording. A “no-cost” refinance does not remove them; it either adds them to the balance or prices them into a higher rate. That can be the right choice if you might move soon, since there is nothing to recover — but over a loan held to term it is the most expensive version.

Two smaller things worth checking: whether your current loan carries a prepayment penalty, which is rare but not extinct, and whether the new lender is escrowing taxes and insurance differently, which changes the payment without changing the loan.

How to shop it

Rates for the same borrower vary meaningfully between lenders, and a refinance is the easiest loan to shop because nothing is contingent on a seller accepting an offer. Gather quotes from several lenders within a short window — credit scoring treats multiple mortgage inquiries inside roughly 14 to 45 days as a single event, so shopping properly costs you nothing.

Compare Loan Estimates rather than advertised rates. The form is standardised precisely so that page two can be read side by side, and the number that matters is the total of lender fees and points, not the headline. A rate that is a quarter-point lower with $4,000 of points is often the worse deal on a loan you will not hold for long.

One risk has no equivalent in a purchase: the appraisal. If the home values lower than expected, your loan-to-value rises, which can reprice the loan or reintroduce mortgage insurance you had escaped. Ask what happens to the quote if the appraisal comes in below a given figure, before you pay for it.

Cash-out refinancing

A cash-out refinance borrows more than you owe and hands you the difference. It converts home equity into spendable money at a mortgage rate, which is far below card or personal-loan rates — genuinely useful for consolidating expensive debt or funding work that adds value.

The risk is the part that is easy to skip: it converts unsecured debt into debt secured by your home. A credit card default damages your credit; a mortgage default takes the house. Consolidating cards this way also fails outright if the cards fill up again, which is the common outcome when the spending that created them is unchanged.

Run your own number

Test both versions of the refinance — matched term and reset term — in the refinance calculator, which reports the break-even month alongside the lifetime cost difference so the trap above is visible rather than implied. Compare the underlying payments in the mortgage calculator, see how the schedule restarts in the amortization calculator, and price a cash-out separately in the cash-out refinance calculator.