Refinance math
Refinance Break-Even Explained
The refinance break-even point is the month when monthly savings have recovered the closing costs. It is a useful screen, but it is not the whole decision.
Quick Take
- Break-even months equal refinance costs divided by monthly payment savings.
- A lower monthly payment can still cost more if the loan term resets too far.
- Refinancing is weaker if you plan to sell before the break-even month.
The simple break-even formula
Divide the total refinance cost by the monthly principal-and-interest savings. If the refinance costs $5,000 and saves $200 per month, the simple break-even point is 25 months.
This quick math works best when the new loan has a similar term and no major cash-out change. It becomes less complete when the refinance restarts the clock or changes the loan balance.
Term reset risk
If you are 7 years into a 30-year mortgage and refinance into a new 30-year loan, you may lower the payment partly because repayment was stretched back out. That can increase lifetime interest even while improving monthly cash flow.
Compare both the monthly savings and the total remaining interest. A refinance can be good for cash flow and still expensive over the full timeline.
Costs to include
Include lender fees, points, title costs, appraisal costs, recording fees, and any prepayment penalty. If the costs are rolled into the new loan, they still count because they increase the debt.
Also compare the new escrow or prepaid items carefully. Some are timing differences rather than pure cost, but they still affect cash needed at closing.
When break-even is not enough
Break-even does not capture every goal. A refinance might shorten the term, remove PMI, switch from an adjustable rate to fixed, or consolidate other debt. Those goals need their own math.
If the main goal is a lower payment, the break-even calculator is a good first pass. If the goal is risk reduction or term shortening, compare the full payoff path.
Run the numbers