Housing

The Refinance Break-Even Calculation Most People Skip

By David Brown · May 2026 · 3 min read

When mortgage rates drop, the refinance calls start. Lenders will tell you you'll save $300 a month. What they're less eager to mention: you'll pay $6,000-10,000 in closing costs to get there.

Whether a refinance actually makes financial sense depends almost entirely on one number: the break-even point. How many months until your accumulated monthly savings exceed what you paid to refinance?

The Basic Calculation

Break-even (months) = Total closing costs ÷ Monthly savings

Example:

  • Current payment: $1,850/month (principal + interest)
  • New payment: $1,550/month (after refinancing to lower rate)
  • Monthly savings: $300
  • Closing costs: $7,200
  • Break-even: 7,200 ÷ 300 = 24 months (2 years)

If you plan to stay in the house for more than 2 years, the refinance makes sense on paper.

What to Include in Closing Costs

Lenders quote closing costs inconsistently. The real number includes:

  • Origination fee: 0.5-1% of loan amount
  • Appraisal: $400-600 typically
  • Title search and insurance: $500-1,000
  • Escrow/attorney fees: varies by state
  • Recording fees: $100-200
  • Prepaid interest: interest from closing date to end of month
  • Points (if paying): each point = 1% of loan, reduces rate by ~0.25%

Realistic total for a $350,000 loan: $7,000-12,000. Get a Loan Estimate from multiple lenders — it's legally required to be accurate within set tolerances.

The "No-Closing-Cost" Refinance

Some lenders offer refinances with no upfront closing costs. The trade-off: higher interest rate (usually 0.25-0.375% above market) or costs rolled into the loan balance.

If you roll costs in, you're borrowing more money — and paying interest on the closing costs for the life of the loan. A $7,500 closing cost rolled into a 6.5% 30-year loan costs you about $16,800 total.

No-closing-cost makes sense if:

  • You're planning to sell or refinance again within 3-4 years
  • You don't have cash for upfront closing costs

Otherwise, paying upfront and getting the lower rate wins over any meaningful time horizon.

The Variable That Kills Refinance Math: How Long You Stay

The break-even calculation only works if you stay in the house past break-even. If you refinance at a 2-year break-even and sell after 18 months, you paid $7,200 to save $5,400. Net loss: $1,800.

The longer you stay after break-even, the more you gain. A refinance that takes 30 months to break even but you stay 10 years saves you substantially.

Tax Deductibility Wrinkle

If you itemize deductions, mortgage interest is deductible. Reducing your rate reduces your deductible interest, which means the after-tax savings are slightly lower than the gross savings.

This effect is usually small — most people don't itemize, and those who do see only modest impact on the refinance math. But for high earners in high-tax states refinancing large mortgages, it's worth running the numbers.

When the Calculator Isn't Enough

Refinance math gets complicated when:

  • You're shortening the loan term (15-year vs 30-year — dramatically different math)
  • You're taking cash out (you're borrowing more, not just repricing existing debt)
  • You're rolling in PMI removal
  • Your credit score has significantly changed

These scenarios need scenario-by-scenario analysis, not a single monthly payment comparison.

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[Run the refinance break-even calculator →](/calculators/refinance)

Enter your current loan, new rate, and closing costs. We'll show you the break-even month, total lifetime savings, and whether it makes sense given how long you plan to stay.

Try it yourself: All free calculators at doesitaddup.com →

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