The refinance break-even point: the only math that matters

The formula is one line

Total refinance costs divided by monthly savings equals months to break even. Suppose a refinance costs $6,000 in fees and taxes and cuts the payment by $200 a month. Six thousand divided by two hundred is thirty: for the first thirty months, the refinance is a loss. Every month after that is genuine savings. Sell or refinance again in month twenty, and the deal never paid for itself.

Everything else in refinance analysis is a refinement of that one line — getting the cost number honest, getting the savings number honest, and checking both against how long you actually expect to keep the loan. A rate that sounds dramatic and a payment that looks pleasant are marketing. Months to break even is arithmetic.

What counts as a cost — all of it

The Consumer Financial Protection Bureau's breakdown of mortgage costs applies to refinances just as it does to purchases: lender origination charges, discount points, third-party fees like the appraisal and title work, and government recording charges. Freddie Mac's consumer guidance on refinancing costs lists the same categories and notes they are commonly measured as a percentage of the loan amount — which means a bigger balance means bigger costs.

In Florida, the government line includes documentary stamp tax on the new note and intangible tax on the new mortgage, which is one reason Florida refinances often cost more than the national articles suggest. Two things do not belong in the cost column: your escrow deposit (the old escrow account is refunded after payoff) and prepaid interest (you skip a payment cycle that offsets it). Counting those overstates the cost and distorts the break-even.

• Count: origination fees, points, appraisal, title, recording, Florida documentary stamp and intangible taxes
• Do not count: new escrow deposits and per-diem interest, which are timing effects, not costs
• If costs are rolled into the balance or into the rate, they are still costs — put them in the numerator

The cost nobody prices: restarting the clock

As the CFPB explains, mortgage amortization front-loads interest: early payments are mostly interest, later payments mostly principal. Six years into a 30-year loan, you have finally started making real progress on principal. Refinance into a fresh 30-year term and you move back to the interest-heavy end of the curve — while stretching the remaining balance over 30 years instead of 24, which is where much of the payment 'saving' actually comes from.

That is why a lower payment can coexist with more total interest. The honest comparison is a new loan with a term matching your remaining term, or keeping the new 30-year loan but paying it at your old payment amount so the extra goes to principal. Run both on an amortization schedule before deciding; the payment-versus-interest gap is often the deciding fact.

Two break-evens: payment and interest

There are really two calculations. The payment break-even — costs divided by monthly payment reduction — tells you when your cash flow recovers. The interest break-even asks a harder question: when does total interest paid under the new loan, plus the costs, fall beneath what the old loan would have charged? With a term reset, the second number arrives later than the first, and occasionally never.

Which one governs depends on your goal. If the point of the refinance is monthly breathing room, the payment break-even is the test. If the point is paying less for the house over your ownership horizon, use the interest version and hold the term constant.

When the math says no

Common failure modes: you plan to sell within the break-even window; the monthly saving is small enough that break-even lands years out; or the costs are financed into the balance, which feels free but accrues interest for decades. A refinance that never breaks even during your ownership is a purchase of a lower payment at a premium price — sometimes still worth it for cash-flow reasons, but it should be chosen with the price tag visible.

Wholesale Mortgage Lending is a Florida mortgage brokerage: we arrange loans through wholesale lenders and do not make, approve, or price them. What we can do is put real lender quotes into this exact framework — costs, savings, months — so the decision is yours and the math is honest. The break-even calculator linked from every refinance page runs the same arithmetic.