When to Refinance Your Mortgage (and When Not To)
Refinancing is sold as free money: a lower rate, a lower payment, cash out of your equity. Sometimes it genuinely is a good deal. But every refinance has closing costs, and every refinance resets a clock. The only question that matters is whether you keep the new loan long enough for the savings to pass the costs — and this guide shows you exactly how to answer it.
The Break-Even Rule
Refinancing makes sense when the monthly saving repays the closing costs before you sell, move, or refinance again. The formula is simple:
Break-even (months) = closing costs ÷ monthly payment saving.
If closing costs are $6,400 and you save $400 a month, break-even is 16 months. Stay past month 16 and every month after is profit. Leave before it and you paid thousands for the privilege of a lower payment you barely enjoyed. Run your own numbers in the Refinance Calculator before you sign anything.
Rate-and-Term vs Cash-Out
- Rate-and-term refinance: You change the rate, the term, or both, without increasing the balance. This is the classic money-saving refinance.
- Cash-out refinance: You borrow more than you owe and pocket the difference. The rate is usually slightly higher than a rate-and-term refinance, and you are converting home equity — money you already own — back into debt. It can make sense for high-interest debt payoff or a major renovation, but it is not "free cash" and it restarts your mortgage clock on a larger balance.
The Term Trap: A Lower Payment Can Still Cost More
Refinancing from a loan with 25 years left into a fresh 30-year loan almost always lowers the payment — and often increases total interest, because you pay for five extra years. If your goal is saving money rather than payment relief, refinance into the same remaining term or shorter, not longer. The worked example below shows how big this difference is.
When NOT to Refinance
- You may move within the break-even window. Selling before break-even turns the refinance into a loss.
- You paid points on your current loan. Points buy a lower rate on that loan only. Refinance, and whatever unrecovered point cost remains is gone.
- You are close to paying the loan off. With a few years left, most of your payment is principal anyway — a lower rate saves little, and closing costs can exceed the remaining interest.
- The saving is tiny. A 0.125% rate drop on an average balance rarely clears closing costs in a reasonable time. As a rule of thumb, look for at least a 0.5-0.75% rate improvement unless your balance is very large.
Worked Example: A $320,000 Loan at 7.5%
Suppose you owe $320,000 with 25 years left at 7.5%. Your current payment is about $2,365 per month. Rates have fallen to 6.0% and closing costs are $6,400. You have two good options — run them both in the Refinance Calculator:
- Refinance to a new 30-year loan at 6.0%: Payment falls to about $1,919 per month, saving $446 a month. Break-even is $6,400 ÷ $446 ≈ 15 months. Total remaining interest drops from about $389,400 to about $370,700 — a saving of roughly $18,700.
- Refinance to a 25-year loan at 6.0%: Payment falls to about $2,062 per month, saving $303 a month. Break-even is $6,400 ÷ $303 ≈ 21 months. But total remaining interest drops to about $298,500 — a saving of roughly $90,900.
The 30-year refinance feels better month to month ($446 saved vs $303), but the 25-year refinance saves nearly five times as much interest because it does not add five extra years of payments. If you can afford the $2,062 payment, the shorter term is the better deal by a wide margin — and the Amortization Calculator will show you exactly how much of each payment goes to interest in either case.