When to Refinance Your Mortgage: The Real Break-Even Math

Interest rates have shifted dramatically in recent years, leaving millions of homeowners wondering: should I refinance? The answer depends on one calculation — the break-even point. Here's how to run the numbers and make the call.

What Is Refinancing?

Refinancing replaces your existing mortgage with a new one — ideally at a lower interest rate, a shorter term, or both. You pay closing costs upfront (typically 2–5% of the loan amount), then save money monthly going forward.

The Break-Even Calculation

Break-even point = Closing costs ÷ Monthly savings

Example: You refinance a $350,000 mortgage from 7.5% to 6.5%. Closing costs: $7,000. Monthly payment drop: $215. Break-even: $7,000 ÷ $215 = 32.5 months. If you stay in the home 33+ months, you come out ahead.

The 1% Rule: Is It Still Valid?

You may have heard 'only refinance if you can drop your rate by at least 1%.' This is a rough heuristic, not a rule. A 0.5% drop on a $700,000 mortgage may absolutely be worth it. A 1% drop on a $120,000 mortgage may not be, if you're planning to move in 18 months. Always do the actual math.

Types of Refinancing

• Rate-and-term refinance: Change the rate, the term, or both — most common
• Cash-out refinance: Borrow more than you owe, take the difference as cash (for renovations, debt payoff)
• Streamline refinance: Simplified process for FHA/VA loans with less documentation
• No-closing-cost refinance: Closing costs rolled into the loan or covered by a higher rate — not free, just deferred

Costs to Factor In

• Origination fee: 0.5–1% of loan amount
• Appraisal: $300–$500
• Title search and insurance: $500–$1,000
• Attorney/notary fees: $200–$400
• Prepayment penalty on current mortgage (check your loan docs)

When Refinancing Makes Sense

• Rates have dropped at least 0.5–0.75% below your current rate
• Your credit score has improved significantly since you bought
• You plan to stay in the home past the break-even point
• You want to shorten your loan term (e.g., 30 → 15 years)
• You want to eliminate PMI (if home value has risen)

When NOT to Refinance

• You're selling in under 2 years
• Closing costs would take more than 4–5 years to recoup
• You'd be resetting a 25-year loan back to 30 years (extending your payoff date)
• A cash-out refi would put you underwater if home prices drop