A refinance is worth evaluating when its benefits over your expected timeline justify the transaction costs and any change in the debt balance or payoff date. There is no single rate-drop threshold that answers this for every borrower.
Define the result you want
A refinance might target lower interest, payment flexibility, a shorter payoff, removal of mortgage insurance, or a different loan structure. Write down the goal before reviewing pricing. Otherwise, an attractive monthly payment can distract from a longer term or larger balance.
Use your current loan as the baseline, including its remaining term and any insurance. Compare it with the actual proposed replacement, not with an advertised rate that uses different assumptions.
Use simple break-even carefully
Suppose transaction costs paid upfront are $4,800 and the comparable monthly principal-and-interest payment falls by $200. The simple cash-flow break-even is 24 months. At 18 months the payment reduction totals $3,600, less than the upfront expense.
That hypothetical calculation excludes balance differences, insurance, financed costs, investment returns, and taxes. It is a first screen. A full comparison should also consider interest and remaining debt at a common future date.
Separate charges from account funding
Distinguish lender and settlement charges from prepaid interest, insurance, and escrow deposits. A refund from the old escrow account is your money coming back, not a discount from the new lender.
A no-cost description needs explanation. Lender credits may be connected with different pricing; financed charges increase debt. Ask what you pay now, what goes into the balance, and how those choices affect the rate and future costs.
Check the payoff date and your exit plans
Replacing a loan with 20 years left with a 30-year loan changes the schedule by a decade. Monthly relief may be useful, but it should be a deliberate decision. Ask for a comparison that preserves your intended payoff timeline.
If a move is likely before costs are recovered, keeping the current mortgage may be reasonable. If you expect to stay, evaluate several holding periods rather than assuming you will keep the new loan for its entire term. Bring competing estimates for a second opinion.
Common questions
How much must rates fall?
It depends on balance, costs, term, insurance, and timeline; a universal one-percent rule misses these differences.
Are financed costs free?
No. They add to the debt and may accrue interest.
Put the comparison to work
Sources & further reading
Reviewed October 27, 2026. Educational information, not an approval or commitment to lend. Examples are hypothetical and exclude items specifically noted. Actual eligibility, costs, and availability vary.