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Mortgage Refinancing: When It Makes Sense and When It Doesn't
Refinancing replaces your existing mortgage with a new one — typically to get a lower interest rate, change the loan term, or access home equity. It can save tens of thousands of dollars over the life of a loan, or cost you money if done at the wrong time or for the wrong reasons. Understanding the break-even point is essential before you decide.
The Break-Even Calculation
Refinancing costs money upfront — typically 2–5% of the loan amount in closing costs ($6,000–$15,000 on a $300,000 loan). Your break-even point is when your monthly savings equal your closing costs. If refinancing saves you $250/month and costs $7,500 in fees, you break even in 30 months (2.5 years). If you sell or refinance again before that, you've lost money.
The Rate Drop Rule of Thumb
The old rule was "only refinance if rates drop by 1% or more." This is outdated — the right threshold depends on your loan size, remaining term, and closing costs. On a $500,000 loan, a 0.5% rate drop can save enough to justify refinancing. On a $150,000 balance near the end of its term, even a 2% drop may not make sense because most of your remaining payments are principal anyway.
Resetting the Clock: The Hidden Cost
When you refinance into a new 30-year mortgage, you restart the amortization schedule. If you're 10 years into your current mortgage, you'll go from 20 years remaining to 30 years — adding a decade of payments. Even at a lower rate, this can cost you more in total interest than you save monthly. Run the full lifetime cost comparison, not just the monthly payment comparison.
Shorter Term Refinancing
If you can afford a higher payment, refinancing from a 30-year to a 15-year mortgage can save six figures in interest while you also benefit from lower rates that typically accompany shorter terms. This is the most financially powerful refinancing strategy for those with the cash flow to support it.
Use the three-way comparison above to model your current loan against two refinancing scenarios simultaneously. Pay attention to the break-even month highlighted in each scenario — if it's beyond your expected time in the home, refinancing likely isn't worth the closing costs.