When a refinance makes sense

A useful rule, then the exceptions

The common rule of thumb is a rate drop of about 0.75 to 1.00 percentage points. That is a starting filter, not a decision. A 0.50-point drop on a large balance with modest fees can beat a 1.00-point drop that is loaded with points and a 30-year reset.

Run the numbers in the refinance break even calculator. If you will not stay past the break-even month, the fee is a gift to the lender.

Situations that often pencil out

Rate-and-term, same or shorter horizon

You keep the balance roughly the same, take a lower note rate, and do not add years you do not need. Monthly P&I falls and remaining interest usually falls with it. This is the cleanest refinance to evaluate.

You can shorten the term without breaking the budget

Moving from 27 years remaining at 6.75% to a 15- or 20-year loan at a lower rate can raise or barely change the payment while cutting a large slice of interest. Break-even on the payment alone may look poor; the interest comparison is the better scoreboard.

You will keep the house well past break-even

Closing costs are paid once. Savings accrue every month you stay. If you expect to sell in two years and break-even is 31 months, walk away — even if the new payment looks attractive on a flyer.

Adjustable-rate reset risk

If an ARM is about to reprice into a higher range and you can lock a fixed rate you can live with, stability can matter as much as the month-one payment. Model the payment you actually expect after reset, not the teaser.

When the payment drop is a mirage

• Re-amortizing to 30 years after you are already 5–8 years in. The payment falls because you bought more time, not only a better rate.
• Cash-out that funds lifestyle spending. You are borrowing against equity. Treat the cash as a loan with a real interest cost, not “free money from the house.”
• Buying the rate down with points you will not recoup. Points are prepaid interest. Add them to closing costs in the calculator.
• High loan-level pricing after credit, occupancy, or condo issues. The advertised “market rate” may not be your rate.
• Prepayment penalties or recapture on the current loan. Rare on modern US conventional loans, still worth a note on older or specialty products.

Questions to answer before you apply

1. How many months will I keep this house and this loan?
2. What is the all-in cash to close, including points I am choosing to pay?
3. Does the new term restart the clock in a way that costs more interest?
4. Will I lose a valuable feature (assumability, a very low remaining balance, or a special program)?
5. Have I compared at least two Loan Estimates side by side?

Next: how break-even is calculated and a closing costs checklist.