How to Calculate Your Refinance Break-Even Point

The refinance break-even point is the moment when your cumulative monthly savings equal your upfront closing costs. Before that point, refinancing cost you money. After it, every month is pure savings. It's the most important number in any refinance decision, and it's simpler to calculate than most people think. NestCalcs has a full Refinance Analyzer built in — use it below to see your exact numbers.

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Key Facts at a Glance
Formula
Closing costs ÷ monthly savings = break-even months
Typical closing costs
2–3% of new loan (~$6k–$10k on $320k loan)
Example (0.75% rate drop)
~$150/mo savings
Break-even (example)
$8,000 ÷ $150 = 53 months
Use refi if
Staying longer than break-even

Frequently Asked Questions

What closing costs should I include in my break-even calculation?
Include all out-of-pocket costs: lender origination fee, discount points, appraisal, title insurance, recording fees, and attorney fees. Exclude prepaid items (property tax, insurance escrow) since these are just timing — you'd pay them anyway. For a no-cost refi (higher rate), the "cost" is the monthly rate premium instead of upfront fees.
For a simple calculation: new P&I payment subtracted from old P&I payment. For a more accurate calculation, also account for any change in property taxes and insurance (usually unchanged), the additional interest cost of rolling closing costs into the loan (if applicable), and the opportunity cost of investing the monthly savings.
For simplicity, calculate pre-tax break-even. If you itemize deductions, the after-tax break-even is slightly shorter (since less interest deduction = slightly higher tax bill on the lower-rate loan). For most borrowers who take the standard deduction, this adjustment is zero.
It's the most important, but not the only one. Consider: Does the refi reset your loan term (paying interest on a longer horizon)? Does it allow you to remove PMI? Does it switch you from ARM to fixed? Are you rolling consumer debt into the mortgage? These factors all affect whether passing the break-even point actually makes you better off.
NestCalcs uses actual amortization math — not simplified estimates — to calculate your true monthly savings, break-even timeline, total interest saved, and net benefit over your planned stay period. It accounts for your remaining loan balance and term, not just the quoted rate difference. Open the Refinance section in the calculator above to run your numbers.
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