The Break-Even Rule: How to Know When to Refinance

The most important question in any refinancing decision is simple: How long will it take to recoup my closing costs through monthly savings? This is the break-even calculation, and it should drive your decision more than the absolute rate difference.

Here's the math: If your current rate is 7.5% and you can refinance to 6.75%, your monthly payment on a $500K loan drops by roughly $240. If your closing costs are $8,000, you break even in about 33 months — just under 3 years. If you plan to stay in the home longer than that, refinancing makes financial sense.

Common refinance closing costs include lender origination fees (0.5–1% of the loan), title insurance, appraisal, recording fees, and prepaid interest. On a $500K loan, expect $6,000–$14,000 in total closing costs. Some lenders offer no-closing-cost refinances, but these typically come with a slightly higher rate — the costs are built in.

Rate-and-term refinancing makes sense when rates have dropped meaningfully (typically 0.5%+ below your current rate), you plan to stay in the home beyond your break-even point, and you can do it without resetting your loan term in a way that increases total interest paid.

Cash-out refinancing has a different calculus. You're borrowing against equity — often at rates lower than HELOCs or personal loans. This can make sense for renovations that add value, paying off high-interest debt, or funding a child's education. The risk: you're converting equity back to debt, and if home values fall, you may be underwater.