Should You Refinance Your Mortgage? Calculator & Break-Even Guide

September 5, 2026 · 5 min read

Refinancing your mortgage can save thousands — or cost you money if the timing is wrong. The decision comes down to one number: the break-even point. If you plan to stay in your home longer than the break-even period, refinancing makes sense. If not, the closing costs eat your savings.

The Break-Even Calculation

Break-even = closing costs ÷ monthly savings. If refinancing costs $6,000 in closing costs and saves you $200/month, your break-even is 30 months (2.5 years). If you plan to stay in the home for 5+ more years, refinancing is clearly worth it. If you might sell in 2 years, it is not.

When Refinancing Makes Sense

The old rule was to refinance when rates drop 1% or more. In today's market, even a 0.5% reduction can be worth it on a large mortgage. Other good reasons: switching from an adjustable rate to fixed rate for stability, removing PMI after reaching 20% equity, or shortening your term from 30 to 15 years.

Hidden Costs to Include

Closing costs typically run 2-5% of the loan amount. These include appraisal fees, title insurance, origination fees, and prepaid items. Some lenders offer no-closing-cost refinances, but they roll the costs into a higher interest rate — calculate both options to see which saves more over your remaining time in the home.

Cash-Out Refinance Considerations

A cash-out refinance replaces your mortgage with a larger one and gives you the difference in cash. This can fund home improvements or consolidate high-interest debt. But you are borrowing against your home — if property values drop, you could end up underwater. Only use cash-out refinancing for investments that increase your home's value or eliminate higher-interest debt.

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Also useful: our Loan Calculator for related calculations.