Updated March 18, 2026
Run your refinance numbers
Calculate your new payment, break-even point, and lifetime savings instantly.
Refinancing makes sense when the monthly savings exceed the closing costs within a timeframe you can reasonably plan around. The popular shortcut is the 2% rule: refinance if your new rate is at least 2 percentage points below your current rate. That heuristic has its uses, but it ignores loan size, closing costs, and how long you plan to stay. The break-even calculation is the more reliable test.
How the break-even calculation works
The formula is straightforward. Take your total closing costs and divide them by the monthly payment reduction. The result is the number of months you need to stay in the home before the refinance pays for itself.
Say your current payment is $2,100 and a refinance drops it to $1,870. That is $230 in monthly savings. Closing costs on a typical refinance run 2 to 5 percent of the loan amount. On a $320,000 balance, that is $6,400 to $16,000. At the low end, $6,400 divided by $230 gives a break-even of about 28 months. At the high end, $16,000 divided by $230 is 70 months, nearly six years. Whether the refinance makes sense depends entirely on how long you intend to stay.
The CFPB's refinancing guide describes this break-even framework and notes that closing costs are often the deciding factor borrowers underestimate when shopping for a lower rate.
The 2% rule and why it is incomplete
The 2% rule originates from an era of more predictable closing costs and less variation in loan sizes. On a $150,000 balance, a 2 point rate reduction might save you $150 a month and cost $4,000 to close, giving you a 27-month break-even. Reasonable. On a $600,000 balance, a 1 point reduction might save $350 a month and carry the same $15,000 in closing costs, breaking even in 43 months. Also reasonable, but the 2% rule would say skip it. The rate drop matters. So does the loan size.
Use the 2% rule as a rough filter for whether to start the process, not as the final answer. Then do the actual math.
What counts as closing costs
Closing costs on a refinance typically include a lender origination fee (0.5 to 1.5 percent of the loan amount), an appraisal ($300 to $600), title search and title insurance ($700 to $1,500), recording fees, and prepaid interest for the days until your first payment. Some lenders offer "no-closing-cost" refinances, which roll the costs into the rate or loan balance. That is not free, it is deferred, and it usually makes sense only if you expect to move or refinance again within a few years.
Where you are in the loan term matters
Mortgage amortization front-loads interest. In the first few years of a 30-year loan, most of your payment goes to interest. By year 20, most goes to principal. If you are 18 years into a 30-year mortgage and refinance into a new 30-year loan at a slightly lower rate, you are extending your payoff by 18 years and restarting the interest-heavy early years of the schedule. You will pay less monthly, but considerably more in total. The amortization explainer has the full picture on how the interest-to-principal ratio shifts over time.
One solution is to refinance into a shorter term, say a 15-year loan, which keeps the total interest paid lower even though the monthly payment may be higher. Another is to keep making your old payment amount on the new loan, directing the difference to principal each month, which speeds up payoff without a formal term change.
Rate environment: timing and expectations
Freddie Mac's weekly Primary Mortgage Market Survey has tracked 30-year fixed rates back to 1971. The average over that period is roughly 7.7 percent. Rates below 5 percent, like those seen from 2020 to 2022, were a historical aberration. Borrowers who locked in at 3 percent and now face 6 to 7 percent rates are in a position where refinancing would cost them money. That is a legitimate reason not to refinance even when rates appear to be declining from a peak.
The corollary: if you bought at a peak rate of 7.5 percent and rates drop to 5.5 percent on a $400,000 loan, the monthly savings of roughly $500 would break even on $10,000 in closing costs in 20 months. That is a compelling case to act.
Cash-out refinancing: the trap to watch
A cash-out refinance lets you borrow more than you owe and take the difference in cash. People use it to pay off credit cards, fund renovations, or cover large expenses. The appeal is real: you are trading 24 percent credit card debt for a 7 percent mortgage rate. The risk is also real: you are converting unsecured debt into secured debt backed by your home, extending your payoff timeline, and paying mortgage interest on what was previously a smaller balance.
Cash-out refinances are not inherently bad, but they are frequently misused. Using home equity to fund a vacation or a car that will depreciate is, mathematically, a poor trade even when the rate looks attractive. The guide to paying off a loan faster has better options for reducing total interest without resetting your loan clock.
When refinancing is clearly worth it
There are situations where the math is not particularly close. Dropping from a 30-year fixed at 7.5 percent to a 15-year fixed at 5.75 percent on a $350,000 balance would increase the monthly payment by about $250 but save roughly $180,000 in total interest over the life of the loan. That is a legitimate trade if you can absorb the higher payment. Switching from an adjustable-rate mortgage to a fixed rate when your ARM is about to reset is another case where the decision is almost always yes, because the alternative is interest rate uncertainty on your largest liability.
When refinancing is probably not worth it
You are two years from paying off your current mortgage. You took a 30-year loan 27 years ago and have $42,000 left. Refinancing into anything adds years and costs you money in closing fees you cannot recoup in 24 months. Similarly, if you are planning to sell the home in the next two years, the break-even math almost never works unless the rate drop is unusually large and closing costs unusually low.
High closing costs on a small remaining balance are also a common dead end. Refinancing $80,000 at a better rate but paying $4,000 in closing costs requires 40-plus months of savings just to break even on the fee, let alone produce net benefit.
Running the numbers yourself
Before calling a lender, run your own estimate. The refinance calculator will show you the new payment, the total savings over the life of the loan, and the break-even month given your current balance, rate, remaining term, and projected closing costs. Bring that number into any lender conversation so you know what you are actually evaluating.
The APR vs. interest rate guide is also worth reading before comparing lender quotes, because the advertised rate and the actual cost can diverge significantly depending on points and fees. Use APR to compare apples to apples.
Payment and savings examples are estimates based on common loan structures and do not account for taxes, insurance, or individual credit factors. Rates change. Not financial advice.
Calculate your break-even point
Enter your current loan details and a new rate to see exactly when a refinance pays off.