A refinance replaces your mortgage with a new one, ideally at a lower rate and payment. The closing costs are the price of admission, and the term reset is the detail that quietly changes the total.

The short answer

Refinancing is worth comparing when the new rate is meaningfully below your current one and you will keep the loan long enough for the monthly saving to cover the closing costs. Divide costs by the monthly saving to find the break-even, then check it against your plans.

The framework

  1. Get your current loan details. Balance, rate, remaining term, and monthly principal and interest.
  2. Get a new loan estimate. Note the rate, the term, and the itemized closing costs.
  3. Compute the monthly saving for the same balance and term.
  4. Divide closing costs by the saving for the break-even month.
  5. Compare to your horizon. Selling or refinancing before break-even usually loses money.
  6. Check the term. A new 30-year loan may lower the payment but raise total interest.

A hypothetical illustration

Figures are illustrative and rounded, not quotes.

  • Current loan: $250,000 balance, 30 years remaining at a fixed 7% interest rate → principal and interest ≈ $1,663.26 monthly.
  • New loan: the same $250,000 and 30-year term at a fixed 6% interest rate, with $5,000 transaction costs paid upfront → payment ≈ $1,498.88 monthly.
  • Monthly saving: about $164.38.
  • Simple break-even: $5,000 ÷ $164.38 ≈ 30.4 months, with the outlay recovered during month 31.

The example uses monthly amortization and nominal interest rates, not fee-inclusive APRs. If costs are financed, the new balance is $255,000 and you must recalculate. This example keeps both remaining terms at 30 years; replacing a loan with only 20 years left with a fresh 30-year loan is a different comparison and can increase lifetime interest.

Read the cash-to-close total carefully

The cash needed at closing can include prepaid interest, taxes, insurance and a new escrow deposit as well as lender and third-party fees. An eventual refund from the old escrow account changes timing, not the quoted interest rate. Identify each category so you do not call every dollar a permanent refinance cost or assume a refund arrives before closing.

Compare each loan's payments and remaining principal at the same future date. A lower monthly payment from a longer term may leave you owing more then. A “no-closing-cost” offer may recover costs through a higher rate or a larger loan; ask how it is funded. Keep cash-out borrowing separate from a rate-and-term comparison because it increases the debt secured by your home.

Costs and limitations

  • Itemized transaction costs reduce the benefit; compare actual Loan Estimates.
  • Term reset can raise lifetime interest.
  • Rolling costs into the loan increases the balance.
  • Cash-out refinancing adds debt secured by your home.
  • No guarantee of approval or of a specific rate.

Your checklist

  • Collect your current rate, balance, and remaining term.
  • Request a loan estimate and read the closing costs.
  • Calculate the monthly saving and break-even month.
  • Decide whether to pay costs upfront or roll them in.
  • Consider a shorter term if you want to pay off sooner.
  • Confirm your time horizon in the home.
  • Keep an emergency fund after closing.

Where to go next

Sources and further reading

Sources checked for this editorial review on September 25, 2026. Examples are illustrative calculations, not provider quotes.