How Refinance Break-Even Works — And When It Matters
A mortgage refinance can lower your monthly payment and save you thousands over time — but it comes with upfront costs. The break-even point is the moment when your accumulated monthly savings equals the total amount you spent to refinance. If you sell or move before reaching that point, you will have spent more on the refinance than you saved.
The Formula, Explained
The calculation is straightforward, but it is important to use the right payment figures:
Break-Even Months = Closing Costs ÷ Monthly Payment Savings
Monthly Savings = Current Payment − New Payment
Net Savings (over stay period) = (Monthly Savings × Months) − Closing Costs
The net savings figure tells you whether the refinance will have been worth it by the time you plan to move. A positive number means you come out ahead; a negative number means you would have been better off not refinancing.
PI vs. PITI — Which Payment to Use
Your mortgage statement may show a "total payment" that includes taxes and insurance (PITI). For a clean break-even comparison, use the principal and interest (PI) portion only. Taxes and insurance can change independently after a refinance and are unaffected by your rate, so including them can make the savings look larger or smaller than they really are.
When Break-Even Can Be Misleading
- Loan term resets: Refinancing a 20-year remaining loan into a new 30-year term lowers your payment but greatly increases total interest paid over time.
- Financed closing costs: Rolling costs into the loan reduces cash out of pocket today, but you pay interest on them for years — the true break-even is longer than the simple formula suggests.
- Escrow changes: Property tax reassessments or insurance increases can reduce the actual saving you see each month.
- Points paid upfront: Always include discount points in your closing cost total for an accurate break-even. They are a real cost even if they lower the rate.
Rules of Thumb
- A break-even under 24 months is generally considered strong for a rate-and-term refinance.
- If you plan to sell within 3–5 years, a break-even beyond 30 months may not be worth pursuing.
- A rate drop of at least 0.75–1% is often cited as a starting point worth exploring, though the exact savings depend heavily on your loan balance.
Related Calculators
- Closing Costs Calculator (US) — estimate the fees you will need to cover at closing.
- Loan Calculator — model your new payment at different rates and terms.
- APR Calculator — understand the true annual cost of your new loan including fees.
- Compound Interest Calculator — see how investing your savings instead could compare over time.