When Does Refinancing a Mortgage Actually Make Sense?

Refinancing replaces your current mortgage with a new one, ideally at a lower rate — but the entire financial case for doing it rests on one comparison: does the monthly savings, accumulated over however long you’ll actually keep the new loan, outweigh the closing costs charged to originate it.

The break-even calculation

The Mortgage Refinance Calculator runs this directly from your current loan and a new offer, showing monthly savings, the break-even point, and — critically — the total interest difference over the full loan life, not just the monthly number.

Why a lower payment can mean more total interest

Refinancing commonly resets the loan term. Someone three years into a 30-year mortgage who refinances into a new 30-year loan is extending their payoff timeline, even at a genuinely lower rate — which can lower the monthly payment while increasing total interest paid, since more months now accrue interest.

Points: paying upfront for a lower rate

Discount points work through the same break-even logic, just applied at origination instead of refinancing. Each point typically costs 1% of the loan amount and buys a rate reduction that varies by lender.

Question	Tool
Should I refinance my existing loan?	Refinance Calculator
Should I buy points on a new loan?	Points Calculator

Both come down to the identical question: how long will you actually hold the loan, compared to the break-even point the upfront cost requires?

Alternatives to refinancing

If your goal is simply paying less interest over time — not necessarily a lower monthly payment — refinancing isn’t the only lever. Extra principal payments and biweekly payment schedules both accelerate payoff without any closing costs at all:

The Extra Mortgage Payment Calculator and Biweekly Mortgage Payment Calculator both show a genuine interest-savings path that doesn’t require qualifying for a new loan or paying closing costs — worth comparing against a refinance offer’s real numbers before assuming refinancing is the only way to pay less interest over time.