How to Know When Refinancing Actually Saves You Money

Calculate break-even points and compare total costs to determine if mortgage refinancing will actually save you money.

1. Calculate your monthly payment difference. Take your current monthly payment and subtract what your new payment would be at the lower rate. Use a mortgage calculator with your remaining loan balance, the new interest rate, and your remaining loan term. This difference is your monthly savings — but only if it's actually lower.
2. Add up all refinancing costs. Get a loan estimate that shows origination fees, appraisal costs, title insurance, and other closing costs. Don't forget prepaid items like property taxes and homeowners insurance. Total refinancing costs typically run 2-5% of your loan amount.
3. Find your break-even point. Divide your total refinancing costs by your monthly savings. This gives you the number of months you need to stay in the home to recover your costs. If refinancing costs $8,000 and saves you $200 monthly, you break even after 40 months.
4. Compare against your timeline. If you plan to stay in the home longer than your break-even period, refinancing likely makes sense. If you might move or sell before breaking even, you'll lose money on the refinance even with a lower rate.
5. Check the rate improvement threshold. The old rule was rates needed to drop 2 percentage points to make refinancing worthwhile. Today's lower closing costs mean a 0.75-1 percentage point drop can work, but run the actual numbers rather than relying on rules of thumb.
6. Factor in the loan term reset. Refinancing usually restarts your 30-year clock, meaning you pay interest longer even at a lower rate. Compare total interest paid over the life of both loans, not just monthly payments. Sometimes keeping your current loan saves more money long-term.