When does refinancing make sense? The break-even math

A lower rate sounds like an easy win, but a refinance isn’t free. You pay closing costs up front (or fold them into the loan), and you only come out ahead after the monthly savings have paid those costs back. That point is your break-even month. This guide shows how to find it, where the simple math can mislead you, and how to decide with your own numbers.

The break-even formula

The basic calculation is short:

How much do costs run? Freddie Mac says to expect about 3% to 6% of the loan principal, depending on your lender and location. On a $300,000 loan, that’s $9,000 to $18,000. Your Loan Estimate shows the real figure, and our closing costs guide explains which of those fees you can shop.

A worked example

For context, Freddie Mac’s survey put the average 30-year fixed rate at 7.18% for the week of November 5, 2026 (6.22% a year earlier), and the 15-year at 6.57%. Your own quote can be higher or lower. Plug in real offers with the refinance calculator.

How costs and savings change the answer

The same formula gives very different answers depending on the two inputs. Months to break even:

This is why a fixed “rate drop” rule of thumb can mislead. A 1-point drop on a large balance can pay back quickly. The same drop on a small balance may take many years, because the dollar savings are smaller while many fees stay about the same.

The term reset: where simple math misleads

The simple formula compares payments. It doesn’t notice that a new 30-year loan restarts the clock. In the example, you had 27 years left. A new 30-year loan adds 3 more years of payments.

• The 30-year refinance lowers the payment the most, but saves only about $17,600 in total interest over the life of the loan, before the $10,800 in costs.
• Matching your remaining term saves less each month, but about $77,500 in interest over the life of the loan.
• A fuller test asks when the interest you’ve saved covers your costs. By that measure, the 27-year option breaks even in about 36 months, slightly faster than the 30-year option (about 37 months), even though its simple break-even looks longer. More of each payment goes to principal.

You don’t need a shorter loan to get some of this benefit. If you take the 30-year loan and keep paying your old amount, the extra goes to principal and shortens the loan. See the effect with the extra payment calculator, or compare terms with the 15 vs. 30 year calculator.

Rolling in costs and “no-cost” refinances

You don’t always pay closing costs in cash. There are two common alternatives, and neither one makes the costs disappear. As Freddie Mac puts it, there’s no such thing as a free loan.

• Roll the costs into the loan. In the example, borrowing $370,800 at 7.00% makes the payment about $2,467, saving about $248 a month. You pay nothing at closing, but you owe more. Counting that higher balance, break-even is about 48 months.
• Take a higher rate with lender credits. The lender covers your costs in exchange for a higher rate. At an assumed 7.375%, the payment would be about $2,486, saving about $229 a month from day one. There’s little to break even on, but you give up some savings for as long as you keep the loan.

A no-cost option can suit borrowers who may move or refinance again within a few years. Paying costs, or buying points, tends to fit borrowers who plan to keep the loan a long time. Our rate buydown calculator shows the break-even on points by themselves.

Reasons to refinance besides a lower rate

• Shorten the term. Moving to a 15-year loan can raise the payment but cut total interest sharply. Freddie Mac’s 15-year average was 6.57% for the week of November 5, 2026.
• Remove mortgage insurance. If your home has gained value, a refinance may let you drop mortgage insurance. Our homeowner guide covers the ways to remove PMI.
• Swap an adjustable rate for a fixed one before a scheduled rate change, if payment certainty matters more to you.
• Take cash out. That’s a different decision with its own trade-offs. Compare it with a HELOC in our home equity guide.

FHA and VA streamline rules

Government-backed loans have their own refinance options with fewer steps, and their own tests:

• VA IRRRL: under federal law, the fees and closing costs must be recouped through lower monthly payments within 36 months. A fixed-to-fixed refinance must lower the rate by at least 0.50 percentage points (2.00 points for fixed to adjustable). You must have made six monthly payments, and 210 days must have passed since the first payment due date.
• FHA Streamline: the refinance must give you a net tangible benefit through a lower rate, a shorter term or both. At least six payments and 210 days since your current loan closed are required.

Texas note: if your current loan is a Texas home equity loan or a past cash-out refinance under Section 50(a)(6), special rules apply to how you can refinance it. Our Texas home equity rules explain them.

Your refinance checklist

1. Know your numbers: current balance, rate, payment (principal and interest) and years left.
2. Get Loan Estimates from more than one lender on the same day, so the quotes are comparable.
3. Run both tests: simple break-even, and total interest compared with keeping your loan.
4. Match the decision to your plans. How long do you expect to stay in the home and keep this loan?
5. Pick your target rate and let rate alerts tell you when the market gets there.

Want a second set of eyes? Ask Lowi™ to walk through your break-even, or pre-qualify to refinance when the numbers work. Kwalifai never sells your number to lenders.