Mortgage refinance · the only number that matters
How long until the new rate earns back the closing costs?
Refinancing is a trade: pay closing costs today, get a smaller payment for the rest of the loan. The break-even is the month you stop being underwater on the deal — if you’ll still be in the house then, refi. If not, don’t.
Your loan, two ways
break-even monthsCurrent loan
$
%
yrs
New loan
%
yrs
$
Plans
yrs
// break-even point
You break even in — months — and you’re keeping the house long enough.
—
months to recoup
Current payment
$—
principal & interest
New payment
$—
↓ — / month
Cumulative savings vs. closing costs
Monthly savings$—
Annual savings$—
Closing costs$—
Net savings if you stay 8 yrs$—
Before you sign
The break-even is necessary, but it’s not sufficient.
i.
Watch the term reset
A new 30-year on year 4 of an old 30-year hands the bank four extra years of interest. The monthly drops, but lifetime cost may rise. Match the payoff date if you can.
ii.
Roll-in costs aren’t free
“No closing costs” usually means a higher rate or fees added to the principal. Either way you’re paying — the calculator above just makes it visible.
iii.
Lock period matters
Rates can move 0.25% in a week. A locked rate buys certainty for 30–60 days; an unlocked one is just today’s quote. Ask before you start the application.
// note The break-even shown is the simple payback (closing costs ÷ monthly savings). The chart adds opportunity-cost framing by plotting cumulative savings vs. the flat closing-cost line.