When is refinancing worth it?
Refinancing is worth it when the monthly savings, over the months you will realistically keep the new loan, exceed what the refinance costs — that is the entire framework, and every rule of thumb is a shortcut across it. The old 1% rule answers the wrong question: what matters is not the size of the rate drop but the cost of capturing it, which is why a quarter-point drop captured through a no-cost structure can be worth taking while a full point that costs $8,000 upfront may not be if you might move or refinance again. Compute three numbers — true monthly savings on a matched term, true costs, and honest expected hold — and the decision falls out.
Last reviewed 2026-08-24
The three honest inputs
Monthly savings must be computed on a matched term: compare the new payment against your old one over your remaining years, not against a fresh 30-year stretch that flatters the refi by extending your debt. Costs must be the real all-in figure from the Loan Estimate — lender fees, third-party costs, and any points — not the advertised sliver. Expected hold is the humbling one: honest answers about moving, upsizing, and the odds you refinance again if rates keep falling. Break-even is costs divided by savings; the loan has to outlive that month to have been worth it. Run your exact numbers
Why the 1% rule survives, and why it misleads
The rule dates from an era of expensive, paperwork-heavy refinancing, where only a large drop could clear the cost hurdle. Modern pricing offers a menu — pay points, pay costs, pay nothing via a lender credit — so the hurdle itself is adjustable. Small drop, no-cost structure: nothing to recover, worth taking. Large drop, long confident hold: paying costs (even points) buys the most rate for the money. The rate drop is one input; the rule mistakes it for the answer. How no-cost refinancing actually works
Structure the refi so the math stays won
Two leaks drain refinances that looked good on paper. The term reset: rolling 25 remaining years into a new 30 lowers the payment partly by adding years of interest — match the remaining term, or keep paying the old amount. The serial-points trap: paying points, refinancing again eighteen months later, and forfeiting the unrecovered value — in falling markets, prefer structures with nothing sunk. A refinance is won at signing by what you agreed to, not at closing by what you felt. The term-reset trap, in full
The reasons beyond rate
Rate is not the only worthwhile trigger. Removing mortgage insurance once equity allows, consolidating a first and second lien, exiting an ARM before its adjustment window, or shortening the term while income is strong can each justify a refinance at an unchanged or even higher rate — the savings just live in a different line. The same three-input math applies; only the “savings” definition widens. What never justifies a refinance: recovering sunk costs from the last one. Each refinance stands on its own arithmetic, forward-looking only.
Ralo is an automated mortgage broker — not a lender — that compares multiple lenders from one application, earns a thin commission, and shows rate, APR, and fees upfront. Rates shown anywhere on this site are illustrative examples, not a loan approval, rate lock, or commitment. Available where licensed: California, Colorado, and Texas.