Refinance — A Light Introduction
Replacing a loan to change rate or term — with tradeoffs
Refinancing means taking a new mortgage to pay off the existing one. The pitch is always a lower rate. The parts that decide whether it is worth doing are the closing costs and the fact that the clock starts over.
Model the basic comparison
Suppose you owe $310,000 at 7.25% with 27 years left, which is about $2,163 a month. Rates have fallen to 6%.
Enter $310,000 at 6% for 27 years and the payment drops to roughly $1,955. That is $208 a month, which is real money.
Refinancing typically costs 2% to 5% of the loan, so $6,200 to $15,500 here. At $8,000 of costs and $208 of monthly saving, the breakeven is about 38 months.
The reset nobody mentions in the ad
Most refinance offers default to a fresh 30-year term. If you are eight years into your original loan, that adds eight years of payments back onto the end.
The monthly payment looks great in that version because the balance is spread over a longer period, not only because the rate improved. Total interest can increase even at a lower rate.
The fix is to match the remaining term. Refinancing 27 years of payments into a 27-year loan captures the rate improvement without adding years.
- Closing costs typically run 2% to 5% of the loan amount.
- Breakeven = closing costs divided by monthly savings.
- A fresh 30-year term can raise total interest even at a lower rate.
- A rate drop of 0.75 to 1 point is a common threshold for considering it.
- No-cost refinances fold the fees into a higher rate or balance.
Other reasons people refinance
Shortening the term is a common one. Moving from a 30-year to a 15-year at a lower rate raises the payment but cuts total interest dramatically.
Dropping mortgage insurance is another. If your home has appreciated past 20% equity, refinancing can remove PMI, though asking your current servicer to remove it is cheaper if you qualify.
Cash-out refinancing converts equity into cash at mortgage rates, which are far below card rates. It also puts your house behind debt that was previously unsecured, which is a serious trade rather than a clever one.
Closing costs and the break-even month
Refinancing is not free. Expect a few thousand dollars in costs, sometimes rolled into the new balance so it feels invisible while still being real.
Divide the total cost by your monthly savings to get the break-even month. Saving $180 a month on $4,500 in costs means twenty-five months before you are ahead.
If you might move before that month arrives, the refinance loses money regardless of how much better the new rate looks.
A no-closing-cost refinance usually means a slightly higher rate instead, which is the same cost arranged differently. Compare the total paid over the years you expect to stay.
Running the decision yourself
Model your current loan with the balance and rate you have now, then model the new one with the proposed rate and a term matching your remaining years.
Divide the total closing costs by the monthly difference to get your breakeven in months. Compare that honestly to how long you expect to stay.
If the breakeven is 38 months and you might move in two years, skip it. If you plan to stay a decade, the same deal is clearly worth doing.
Do not refinance on a headline
Advertised rates are for borrowers with excellent credit, substantial equity, and often points paid at closing. The rate you are offered may be half a point higher than the one that caught your attention.
Refinancing repeatedly is its own trap. Each round resets the schedule and adds fees, and a household that refinances three times in a decade can pay closing costs three times while never getting past the interest-heavy years.
Set a threshold in advance — a rate drop of at least 0.75 points with a breakeven under three years, for instance — and ignore everything that does not clear it.
Try these inputs
- Current loan: $310,000, 7.25%, 27 years
- Refinance matched term: $310,000, 6%, 27 years
- Refinance reset to 30: $310,000, 6%, 30 years