Lifestyle

6 Things Most People Get Wrong About Refinancing a Mortgage

By Mike Harper · August 2, 2026

The math looks simple: your rate is higher than today’s rate, so you refinance. But the math is rarely that simple, and lenders benefit from you not doing it.

You need more than a lower rate — you need enough of a lower rate. Refinancing comes with closing costs, typically 2% to 5% of the loan amount. On a $300,000 mortgage, that’s $6,000 to $15,000. If the new rate saves you $150 a month, it takes 40 to 100 months — roughly 3 to 8 years — to break even. If you plan to move before then, you’re paying to save money you’ll never collect. The break-even calculation is the single most important number in any refinancing decision, and it’s the one most borrowers skip.

Your loan term resets — and that costs more than you think. Refinancing a 30-year mortgage into a new 30-year mortgage restarts the amortization clock. In the early years of a mortgage, most of your payment goes to interest. If you’re 10 years into a loan and refinance into a new 30-year term, you’ve extended your total repayment by a decade and shifted your payment structure back toward interest-heavy. The monthly payment drops, but the total cost over the life of the loan increases.

Cash-out refinancing turns equity into debt. Cashing out equity to pay for a renovation, consolidate debt, or cover expenses feels like free money. It isn’t. You’re borrowing against your home and converting ownership into liability. If property values drop, you could owe more than the house is worth. Using home equity to pay off credit card debt is especially risky — you’re swapping unsecured debt for debt secured by your house.

Your credit score affects the rate you’re offered. Lenders advertise their best rates, which require excellent credit. If your score is below 740, the rate you’re offered may be significantly higher than the advertised number — sometimes high enough to eliminate the savings that made refinancing seem worthwhile. Check your score before applying, not after.

Private mortgage insurance can come back. If your original down payment was less than 20%, you may have finally paid off your PMI through equity growth. Refinancing resets the loan-to-value calculation. If the new loan amount exceeds 80% of the home’s appraised value — especially after a cash-out refinance — PMI comes back, adding $100 to $300 per month to a cost you thought you’d eliminated.

The lender’s incentive is volume, not your savings. Loan officers earn commissions on refinancing transactions. A loan officer who recommends refinancing at a 0.25% rate reduction with $10,000 in closing costs earns a fee regardless of whether the deal makes financial sense for you. Running your own break-even calculation and comparing at least three lender quotes protects you from refinancing that benefits the lender more than the borrower.

Refinancing is a financial tool, not a financial favor. The decision should be driven by math — your break-even point, your time horizon, and your total cost — not by the feeling that a lower number is automatically better.