How to know if refinancing your mortgage is actually worth it

Refinancing can lower your monthly payment — but it also costs money upfront. The only real question is whether the savings catch up to that cost before you sell or move. Here's how to think it through.

The one number that actually matters: break-even

Every refinance has two sides: what it costs you upfront (closing costs, lender fees, appraisal, title work — often $3,000 to $10,000+), and what it saves you every month afterward, if your new payment is lower than your old one.

Your break-even point is simply: refinance cost ÷ monthly savings = months to break even. If refinancing costs $9,500 and saves you $349 a month, you break even in about 27 months — a little over two years. Every month after that is money back in your pocket. Every month before that, you're still paying off the cost of getting the new loan.

Why break-even matters more than the interest rate

A lower rate always sounds good, but a lower rate with high closing costs can actually leave you worse off if you don't stay long enough to recoup them. Two refinances that both lower your rate by the same amount can have very different break-even timelines depending on the fees attached — so the rate alone isn't the full picture.

Where simple break-even can fool you

The simple formula treats every dollar of payment drop as savings. But if you're eight years into a 30-year loan and refinance into a new 30-year loan, part of your lower payment comes from stretching the remaining 22 years back out to 30 — not from the better rate. Your payment drops, but you're paying the balance down more slowly.

That doesn't make resetting to 30 years a mistake. A lower required payment is real flexibility, and most loans end in a sale or another refinance long before year 30. It just means the honest comparison is what you'll pay over the years you'll actually keep the loan, counting the equity you build — not the monthly payment alone.

Questions worth asking before you refinance

• How long do I realistically plan to stay in this home? If you're likely to move in 2–3 years, a refinance with a 4-year break-even is probably not worth it.
• Am I comparing total costs, not just the rate? Ask lenders for the full closing cost breakdown, not just the headline interest rate.
• Does this reset my loan term? If so, compare against a term that matches what you have left, or keep making your old payment on the new loan — you keep your original payoff date and turn the lower rate into faster payoff.
• Is a no-closing-cost refinance actually free? Often these roll the costs into the loan balance or trade for a higher rate — worth running the real numbers rather than assuming "free" means free.

Run your own numbers

Start with three numbers — your current payment, your new payment, and the cost to refinance — for your simple break-even. Then open "Full picture" and add your balance, rates, and how long you'll keep the loan to see what the refinance really saves you, side by side with a term-matched loan and the keep-your-old-payment option.

Try the free break-even calculator → Go straight to the full picture