When Is Mortgage Refinancing Worth It? A Decision Framework

What Is Mortgage Refinancing?

Refinancing means replacing your current mortgage with a new one, typically to secure a lower interest rate, change your loan term, or access equity. While it can be a powerful financial move, it is not always the right choice.

The Break-Even Calculation

The most important number in any refinancing decision is the break-even point — how long it takes for your monthly savings to exceed the costs of refinancing.

Formula: Break-even months = Total refinancing costs ÷ Monthly payment savings

Example: If refinancing costs $5,000 and saves you $200/month, your break-even point is 25 months. If you plan to stay in the home longer than that, refinancing makes sense.

When Refinancing Usually Makes Sense

• Rate drop of 1% or more: A significant rate reduction on a large balance creates substantial savings.
• Improving credit score: If your credit has improved significantly since your original mortgage, you may qualify for much better terms.
• Switching from variable to fixed: Locking in a low fixed rate provides payment certainty.
• Shortening your term: Moving from a 30-year to a 15-year mortgage often comes with a lower rate and dramatically reduces total interest.

When Refinancing May Not Be Worth It

• You are late in your loan term: If you are in the final 5–10 years, most payments already go toward principal. Refinancing resets the amortization clock.
• High closing costs: If fees exceed potential savings, the maths does not work.
• Planning to sell soon: If you will not reach the break-even point before selling, you lose money.
• Extending your term: Refinancing from a 20-year remaining term to a new 30-year term reduces payments but increases total interest dramatically.

Refinancing + Extra Payments

A powerful strategy is to refinance to a lower rate and then continue making your old, higher payment. The difference goes directly to principal, accelerating your payoff. Use our mortgage calculator to model this scenario.