The Break-Even Calculation Every Homeowner Should Know

By Mike Fake · October 2025 · 4 min read

A refinance can save you a significant amount of money — or cost you money, if you don't stay in the home long enough to recoup the closing costs. The break-even calculation is the single most important piece of math in any refinance decision, and it's simpler than most people think.

The Simple Formula

Break-even point = Total closing costs ÷ Monthly savings

If your closing costs are $8,000 and your new payment is $400/month lower than your old one, you break even in 20 months. If you plan to stay in your home longer than 20 months, the refinance makes financial sense. If you're planning to sell in a year, it doesn't.

What Closing Costs Actually Include

Refinance closing costs typically run 2–3% of the loan balance. On a $900,000 loan in San Diego, that's $18,000–$27,000. These costs include lender origination fees, appraisal, title insurance, escrow, and prepaid items like property taxes and homeowner's insurance. Some of these are negotiable — as your broker, I shop for the most competitive combination of rate and fees, not just rate alone.

The "No-Cost" Refinance Option

Many lenders offer what's called a no-cost refinance, where closing costs are rolled into the loan or paid via a slightly higher interest rate. This can make sense if you're not sure how long you'll stay — you start saving from day one and don't risk losing money if you sell sooner than expected. The trade-off is a slightly higher rate or larger loan balance.

A Real San Diego Example

Let's say you have a $900,000 loan at 7.25% with a payment of roughly $6,140/month (P&I). Rates drop to 6.25%. Your new payment would be around $5,545/month — saving you about $595/month. If closing costs are $15,000, your break-even is 25 months, or just over two years. If you plan to stay in your Carlsbad or Encinitas home for at least three more years, this refinance likely makes sense.

When I'll Tell You Not to Refinance

I run this calculation for every client, and sometimes the honest answer is: don't do it. If you're selling in two years, if the rate improvement is minimal, or if you're deep into a 30-year loan and would reset the clock unnecessarily — I'll tell you. My goal is to give you the same advice I'd give a close friend.