Should I Refinance My Mortgage? A Break-Even Walkthrough

Refinancing sounds like free money — replace your old loan with a cheaper one, keep the difference. The catch is that refinancing isn’t free, and the savings only show up if you stay in the home long enough to recover the closing costs. Here’s how to know when the math works.

What refinancing actually does

A refinance pays off your existing mortgage with a new one. People typically refinance for one of four reasons: a lower rate, a shorter term, switching from an adjustable-rate to a fixed-rate loan, or a cash-out refinance to pull equity out of the home. The first reason — chasing a lower rate — is the most common, and the one we’ll focus on first.

The break-even calculation

Refinancing has up-front costs, called closing costs, that typically run between 2% and 5% of the new loan amount. They include lender fees, title insurance, appraisal, recording fees, and prepaid escrow. On a $300,000 loan, that’s usually $6,000–$15,000.

The break-even is the number of months it takes for the lower payment to make back those costs:

Break-even months = closing costs ÷ monthly payment savings

If your closing costs total $6,000 and the new loan saves you $200 a month, you break even at month 30. After month 30, every dollar of savings is in your pocket. If you sell or refinance again before month 30, you lost money on the deal.

A worked example

Suppose you have:

• Current loan balance: $300,000
• Current rate: 7.0% (30-year fixed, 27 years remaining)
• Current monthly P&I: $1,996

You’re offered a refinance into a new 30-year fixed at 5.5% with $7,500 in total closing costs. The new monthly P&I on $300,000 at 5.5% over 30 years would be about $1,703, a savings of $293 per month.

Your break-even is $7,500 ÷ $293 ≈ 26 months. If you plan to stay in the home longer than 26 months, the refinance is a clear win. If there’s any chance you’ll sell or move within that window, it probably is not.

One important caveat: stretching from 27 years remaining back out to a fresh 30-year term resets your amortization clock. Your monthly payment drops, but the total interest you pay over the life of the loan can actually go up if you don’t accelerate principal payments. Compare total interest paid, not just the monthly number, when you evaluate the offer.

Four cases where a refinance is almost always worth it

1. The new rate is at least 1 percentage point lower and you plan to stay for at least 3–5 more years. The break-even is usually well within that window.
2. You can refinance into a 15-year loan at a rate that keeps your payment manageable. A 15-year cuts total interest paid by roughly half and forces faster equity-building.
3. You’re moving from an ARM to a fixed-rate loan as your adjustment date approaches. Trading volatility for certainty has value beyond the raw interest cost, especially if rates are rising.
4. You can drop PMI by refinancing now that your home has appreciated past 20% equity. The PMI savings alone can pay for closing costs quickly.

When a refinance is usually a bad idea

• You plan to sell within the next 1–2 years. Closing costs almost never pay back that fast.
• The rate drop is small (under 0.5%). The savings rarely outpace the costs.
• You’re cashing out to consolidate credit-card debt and you don’t plan to change the spending behavior that created the debt. You’re trading unsecured debt for debt secured by your home — which means your house is on the line if you can’t pay.
• You’re close to paying off the existing loan. Late in the amortization schedule, almost all of your payment goes to principal — a refi resets that clock and stretches you out again.

Cash-out refinance: the 60-second version

A cash-out refi replaces your existing loan with a larger one and gives you the difference in cash. It can make sense for a major home renovation that boosts the home’s value, but at today’s rates the break-even on a cash-out is usually steep, and you’re re-pledging your home for the new debt. A HELOC or home equity loan is sometimes the better tool, especially if your first-mortgage rate is already low — refinancing the whole loan to a higher rate just to get cash is a poor trade.

The five-step decision checklist

1. Get at least three rate quotes — the spread between lenders is real.
2. Add up all closing costs from each loan estimate. Watch for discount points and origination fees buried in different lines.
3. Compute monthly savings using the same loan term as your current loan, not a fresh 30-year. Otherwise the comparison is rigged.
4. Divide closing costs by monthly savings to get your break-even in months.
5. Compare break-even to how long you plan to stay. If break-even < stay, refinance. If not, don’t.

Run the numbers in 30 seconds

Use our refinance break-even calculator to see your exact break-even point and the total interest savings over the life of the loan. Punch in your current loan, your offered rate, and the closing costs from your loan estimate, and the answer comes out instantly.

Want to compare a 15-year refinance against a 30-year before deciding? Read 15-year vs 30-year mortgage next.