Refinance Break-Even Calculator

What this calculator does

This calculator answers two related but distinct questions about refinancing your mortgage:

1. Break-even. How many months does it take for your monthly savings to add up to the closing costs?
2. Lifetime savings. Across the full life of both loans, do you actually pay less in total interest?

These can give different answers. A 30-year refinance can drop your monthly payment substantially while still increasing total interest over time, because you're stretching what was a 25-year loan into a new 30-year term.

How break-even works

Break-even is straightforward arithmetic:

break-even months = upfront closing costs / monthly savings

If you roll closing costs into the loan, your upfront cash is zero and break-even is immediate — but you'll pay interest on those rolled-in costs for the full new term, which shows up in the lifetime savings number.

The 1% rule of thumb

A common shortcut: refinance only if you can drop your rate by at least 1 percentage point and you'll stay in the home longer than the break-even period. The 1% threshold has historically been a good guide because closing costs are typically 2–4% of the loan, so a smaller rate drop rarely produces enough savings to recoup costs in a reasonable window.

Tips and common mistakes

• Don't reset the term. Going from 25 years remaining to a fresh 30-year loan adds five years of interest. Ask your lender for a custom term, or commit to paying extra principal.
• Watch the total cost, not just the rate. A “no closing cost” refi usually has a higher rate to cover those costs over time.
• Time your refi. If you're likely to move in the next 2–3 years, the break-even math rarely works.
• Shop around. Get quotes from at least three lenders. Closing costs and rates vary substantially.

Frequently asked questions

What is the refinance break-even point?

Break-even is how long it takes for your monthly savings to add up to the closing costs you paid. If closing costs are $4,000 and your monthly savings are $200, break-even is 20 months. Stay in the home longer than that and the refi pays off; sell or refinance again sooner and you lose money.

What is a good break-even period?

A common rule is to refinance only if you'll stay in the home at least twice the break-even period. Under 24 months is generally good; 24–36 months is acceptable if you're confident you'll stay; over 60 months means you likely won't recoup the costs.

Should I roll closing costs into the loan?

Rolling costs into the loan keeps your upfront cash at zero and triggers an immediate break-even, but you pay interest on the closing costs for the full new loan term. If you have the cash and plan to stay long-term, paying upfront is usually cheaper. If you don't, rolling them in can still be worth it.

Is refinancing worth it for me?

Refinancing usually makes sense when (1) your new rate is at least 0.5–1% lower, (2) you'll stay in the home past the break-even point, and (3) you can absorb the closing costs without straining cash flow. It almost never makes sense if rates have gone up or you're moving in the next 1–2 years.

How does extending my term affect total interest?

Going from a 25-year remaining term back to a 30-year refi can lower your monthly payment significantly but adds five years of interest. The lifetime interest can be higher even at a lower rate. To capture the rate savings without the term reset, ask for a custom term that matches your remaining time, or pay extra principal each month.

What about cash-out refinances?

A cash-out refinance lets you tap home equity by borrowing more than you owe. Closing costs and rates are usually higher than a standard refi. This calculator models a rate-and-term refi (no cash out). For cash-out, add the cash-out amount to your current balance.