When Is Refinancing Your Mortgage Worth It?

The break-even calculation

The core test is simple: divide the total cost of refinancing by the amount you save each month. The result is how many months it takes to break even. If closing costs are $4,000 and you save $200 a month, you break even in 20 months — after that, the savings are pure gain.

Then compare that break-even to how long you'll keep the loan. If you plan to sell in a year but break even in 20 months, refinancing loses money. If you're staying a decade, a 20-month break-even is easily worth it.

The rate-drop rule of thumb

A widely quoted guideline says refinancing is worth exploring once rates fall at least 0.75 to 1 percentage point below your current one. The bigger the loan, the smaller the drop needed to justify it, because the monthly saving scales with the balance.

But the rule is only a screen, not a decision. A 1-point drop with high fees and a near-term move can still lose money, while a smaller drop on a large, long-held loan can be clearly worth it. Always run the break-even before committing.

What closing costs to watch

Closing costs typically run 2–5% of the loan amount and include origination fees, appraisal, title work and recording fees. Rolling them into the new loan avoids upfront cash but adds interest, pushing the true break-even further out than it first appears.

Also watch the loan term. Refinancing a 30-year mortgage after five years into a fresh 30-year loan lowers the payment but resets the clock, so you can pay more total interest even at a lower rate. Compare like-for-like terms, or keep the remaining term when you refinance.

Frequently asked questions

How do I calculate my refinance break-even?

Divide total closing costs by your monthly payment saving. $3,600 in costs and $150 saved per month gives 24 months to break even. Refinancing pays off only if you keep the loan longer than that.

How much should rates drop before refinancing?

A common rule of thumb is at least 0.75 to 1 percentage point below your current rate, but it's only a starting screen — the break-even calculation is what actually decides.

Does extending the loan term save money?

It lowers the monthly payment but usually raises total interest, since you're borrowing for longer. To truly save, compare the same remaining term at the new rate, not a fresh longer one.

Can I refinance with no closing costs?

So-called no-cost refinances fold the fees into a slightly higher rate or a larger balance, so you still pay — just spread over time. Compare the total cost over how long you'll keep the loan.