Mortgage Refinance vs. Payoff: Which Saves More Money?

Refinancing and making extra principal payments are the two most common ways to reduce mortgage costs. They work differently, cost differently, and suit different borrowers. This guide compares both with real numbers so you can pick the right tool.

How refinancing works

Refinancing replaces your current loan with a new one — ideally at a lower rate, a shorter term, or both. The benefits are immediate: lower monthly payment, less total interest, or faster payoff. The costs are also immediate: closing costs of 2%–5% of the loan amount, plus time and paperwork.

How extra principal payments work

Extra principal payments don't change your loan terms. They reduce the balance faster, which reduces the interest charged each month. The effect compounds over time. There are no closing costs, no credit check, and no appraisal. The downside: your monthly payment stays the same until the loan is gone.

The break-even test

A refinance only makes sense if you recover the closing costs through interest savings before you sell or pay off the home. The rule of thumb: break-even under 3 years is usually worth it; over 5 years, rarely. Calculate it: closing costs ÷ monthly savings = months to break even.

Scenario: $350,000 remaining at 6.8%, 25 years left

Option A: Refinance to 5.5% for 20 years

New payment: $2,408 (up from $2,284). Closing costs: $7,000. Interest saved versus staying put: $98,000. Break-even: 18 months. Total cost: lower, but cash flow is tighter.

Option B: Keep 6.8%, add $300/month principal

New payoff: 19.5 years. Interest saved: $134,000. Closing costs: $0. Total cost: lower than refinancing, and you keep flexibility. If you lose your job, you can stop the extra payments. With a refinance, you can't lower the payment.

When refinancing is clearly better

• Rates have dropped 1% or more since your origination
• You're shortening term (30 to 15) and the payment is still comfortable
• You need to convert an ARM to a fixed rate for stability
• You have significant equity and want to remove PMI
• Break-even is under 24 months and you plan to stay 5+ years

When extra principal is clearly better

• Rates haven't dropped enough to justify closing costs
• You value flexibility — extra payments can stop anytime
• You might move within 5 years (refinance savings won't materialize)
• Your credit or income has changed, making approval uncertain
• You have irregular income and can't commit to a higher fixed payment

The calculator comparison

The Mortgage Payoff Calculator lets you model extra payment scenarios instantly. For refinancing, add the new rate and term and compare the total interest. The best choice is the one with the lowest total cost that fits your cash flow and timeline.