When refinancing makes sense

A refinance is a new loan. It is worth the paperwork only if the interest and features you gain beat the costs and the term you take on.

Finance Calculator Pro team·Updated October 14, 2026·3 min read

Two schedules, not a rule of thumb

Folklore about “a one-point drop” or “two years in the home” skips the remaining term, the new term, and the fee. The refinance calculator runs the current remaining amortization against a replacement loan and then subtracts cash closing costs from the interest gap.

monthly savings = current P&I − new P&I
break-even months = ceil(cash costs ÷ monthly savings); Immediate when costs are financed
lifetime savings = old interest − new interest − cash costs

Cash costs versus rolled-in costs

Closing costs on a refinance show up on the Closing Disclosure: origination, title, recording, prepaid interest, and similar lines. Paid in cash, they set the break-even clock. Rolled into the new principal, they disappear as cash and reappear as a larger loan and more interest. When the payment still falls, the calculator reports break-even as “Immediate (costs financed)” rather than “0 months,” because there is no cash outlay to recoup. The checkbox is there so you can see that trade, not so the site can pick one.

Points you pay to buy the rate down are a prepaid finance charge. IRS Publication 936 describes how refinance points are often deducted over the life of the loan rather than in the year paid. That tax timing is not in the break-even month count.

Reasons that are not a lower rate

Some refinances exist to drop PMI after the house has appreciated, to change an adjustable note into a fixed one, to shorten the term, or to take cash out. Cash-out raises the balance and is a different risk than a rate-and-term swap. This site’s refinance tool only adds closing costs when you roll them in; it is not a cash-out worksheet.

If the goal is simply to pay the current note off faster, extra principal on the loan you already have may be cheaper than a refinance. Compare the payoff calculator with a refinance run before you pay application fees.

What the calculator cannot see

How long you will keep the house. A 23-month break-even is useless if you sell in twelve. Closing-cost credits and lender-paid pricing that raise the rate. Prepayment penalties on the old note. Discount points. A change in escrow or in tax deductibility. Credit, occupancy, and appraisal conditions that determine whether the new loan exists at the rate you typed.

Ability-to-repay and qualified-mortgage rules in 12 CFR 1026.43 still apply to most refinances. A lower payment does not require a lender to approve you. The CFPB explore, compare, and close pages are the consumer walkthrough for real offers.

Rates in the background

National averages live on FRED’s 30-year series and in the Federal Reserve H.15 release. They describe the environment. They are not a lock, and they do not include your credit or points. When this site prefills a mortgage rate, it is that public snapshot.

A sensible checklist, not advice

Write down remaining balance, current rate, and years left from the servicer — not from memory. Get a Loan Estimate for the replacement. Run both loans in the refinance calculator with the estimate’s costs. Look at monthly savings and lifetime savings. Ask whether you will still be in the house past break-even. Then decide with a professional if the file is more than a classroom example. This guide is not a recommendation to refinance.