Homeowners who bought or refinanced in 2022–2024 often carry rates in the mid-to-high 6s and 7s. In early September 2026, Freddie Mac’s 30-year average sat near 6.71%. That is not an automatic refinance for everyone. A 0.5-point drop on a large balance with cheap fees can win; a 1-point drop with 5% costs and a move in two years can lose.
It is often worth running the numbers when
- Your quoted rate is meaningfully below the rate you pay, and you can recoup closing costs before you expect to sell.
- You want to finish the loan sooner and can handle a higher payment on a 15- or 20-year term.
- You have reached about 20% equity and can drop PMI or FHA mortgage insurance by moving to a conventional loan.
- An ARM is about to adjust and a fixed rate would buy you sleep.
- Your credit or income is stronger than when you originated, and a new underwrite produces a better price.
The stay-horizon test
Ask one question the payment delta hides: if I sell in N years, am I ahead after costs? That is the stay-horizon net on the calculator. It adds what you pay until then, what cash you put down at closing, and the remaining balance you would pay off at sale. If that number is negative, the refinance is a gift to the closing table.
A simple companion is cash break-even: closing costs divided by monthly savings. Many planners look for a recoup inside two to three years. That rule fails if you roll costs into the loan (there is no cash outlay) or if you are shortening the term (the payment may rise while interest falls).
A worked example
Take a remaining balance near $320,000. A quote shows $6,400 in cash closing costs and $200 less in principal and interest each month. Cash break-even is 32 months. If your honest stay horizon is 24 months — a job transfer, a downsize, a planned sale — you would pay $6,400 to enjoy $4,800 of payment savings and leave money behind. Stretch the same quote to a five-year stay and the payment savings alone are $12,000 before you even count interest differences on the remaining balances.
Now change the product. Same balance, but you refinance into a 15-year loan. The payment rises; cash break-even looks ugly. Lifetime interest and the earlier payoff date may still win if you will keep the home. That is why “when to refinance” is not only “when the rate drops.” It is when the full comparison — costs, term, PMI, and time in the house — comes out ahead on a plan you believe.
When to wait
- You might move, retire, or refinance again before break-even.
- The new term is longer and total interest rises even though the payment shrinks.
- You would cash out for a purpose cheaper than mortgage interest — for example, a 0% promotional card you can actually pay off.
- Your current rate is already near the best quotes you can get after points.
- Your credit score or debt-to-income ratio would force a worse price today than if you waited a few months to clean up revolving balances.
Timing around rates, not headlines
Freddie Mac’s weekly average is a useful snapshot, not a personal quote. Your note rate, credit tier, loan size, occupancy, and points drive the price a lender will lock. A national average near 6.71% (week of Sep 3, 2026) tells you the market moved; it does not tell you whether your Loan Estimate beats the loan you already have after fees.
If you are choosing between waiting for another quarter-point drop and locking a solid quote you can already recoup, run both stories with the same stay horizon. A bird-in-hand refinance that breaks even in under three years often beats hoping for a slightly better rate while you keep paying the old one.
Shop the quote, not the headline rate
Two lenders can show the same rate with very different origination fees and points. Pull at least three Loan Estimates, plug each into the calculator, and keep the stay horizon the same. The winner is the loan that leaves you ahead after costs — not the one with the roundest rate.
How to use the calculator for a go / no-go
- Enter your current loan exactly as it sits today: balance, rate, years left.
- Enter the new rate and term from a written quote, plus closing costs (or 2% of the new loan as a sketch).
- Set the stay horizon to the earliest year you might sell or refinance again.
- If stay-horizon net is negative at that horizon, either negotiate fees, seek a lender credit, or wait.
- If you are also considering cash-out, run a $0 cash-out scenario first so you know what the rate-and-term deal alone is worth.
Credit, equity, and life events
A refinance underwrite looks at today’s credit score, income stability, and debt-to-income ratio. If you have recently paid down revolving balances or a year of stronger W-2s, a new file can price better than the loan you closed when rates were higher and your profile was thinner. The reverse is also true: a fresh collection or a job change can erase a promising rate drop.
Equity matters for PMI and for program choice. Crossing roughly 20% equity can open a conventional refinance that drops mortgage insurance you still carry on an FHA loan. That monthly saving stacks on top of any rate change and can pull break-even forward by many months. If equity is thin, a cash-out ask may not clear 80% loan-to-value even when a rate-and-term deal would.
Life events change the stay horizon more than rate charts do. A planned move, a marriage that may sell one house, or a retirement that may downsize should shorten the horizon you enter in the calculator — even if the note has 25 years left on paper.
Related questions
For what a refinance actually replaces at closing, see how refinancing works. For the month when savings catch fees, see break-even. For fee line items and no-cost pricing, see closing costs.
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