When To Refinance Your Mortgage: Rules, Math and Break-Even (2026)
When refinancing actually saves money, how to calculate your break-even month, and the refinance mistakes that quietly cost you more.
Refinance when the rate drop saves enough monthly to recoup your closing costs before you plan to move — usually a 0.75–1% drop with a break-even under 2–3 years.
What you'll walk away with
Skim these first — then dig into the details below.
- 1A rate drop of 0.75–1% or more is the usual threshold worth acting on.
- 2Break-even = closing costs ÷ monthly savings; stay in the home past that month.
- 3Restarting a 30-year term can raise total interest even at a lower rate.
- 4Cash-out refinancing adds debt — reserve it for value-adding uses only.
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Refinancing swaps your current mortgage for a new one. Done at the right time it saves tens of thousands; done reflexively it resets your amortization clock and adds thousands in closing costs.
One calculation decides it: how long you need to stay to recoup what the refinance costs.
When refinancing makes sense
Rate is the headline reason, but it is not the only one worth a new loan.
- Your rate would drop by roughly 0.75–1% or more.
- You have hit 20% equity and can drop PMI.
- You want out of an adjustable-rate loan before it adjusts.
- You can shorten the term (30 to 15 years) and afford the higher payment.
- Your credit score has improved substantially since you bought.
Run your break-even
This is the whole decision in one line of arithmetic.
- 1
Total the closing costs from the Loan Estimate — origination, appraisal, title, recording.
- 2
Subtract the new monthly payment from your current one to get monthly savings.
- 3
Divide costs by savings — that is your break-even in months.
- 4
Compare it honestly to how long you plan to stay.
The term-reset trap
A lower payment is not the same thing as less interest. Refinancing 22 years of remaining balance into a fresh 30-year loan can raise the lifetime total even at a better rate.
- Ask the lender for total interest remaining on both loans, not just the payment.
- Refinance into a term close to what you have left when you can afford it.
- If only a 30-year works for cash flow, pay extra principal voluntarily.
- Rolling closing costs into the balance means paying interest on fees for decades.
Cash-out refinances: use with care
A cash-out refinance converts equity into spendable cash at mortgage rates. That is cheap money attached to your house.
- Reasonable uses: structural repairs, renovations that add value, or wiping out 20%+ APR debt with a written plan.
- Poor uses: vacations, cars, or anything you will finish before the loan does.
- You are converting unsecured debt into debt secured by your home — a missed payment risk changes entirely.
- For smaller amounts, compare a HELOC vs home equity loan first.
How to shop the refinance
Rates are quoted per borrower per day — comparison shopping is the single biggest lever you control.
- 1
Collect Loan Estimates from at least three lenders on the same day.
- 2
Compare APR and total closing costs side by side, not just the rate.
- 3
Ask each lender to beat the best offer you have in writing.
- 4
Lock the rate once your break-even math works — see how to compare mortgage loans.
Disclaimer: This page includes AI-assisted educational content reviewed for general accuracy. It is not personalized financial, tax, or legal advice. Verify numbers with a qualified professional and our editorial standards.
Continue reading
Related guides that deepen the same decision.
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ReadReady to plug in your numbers?
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