A Montana mortgage refinance only makes sense if you stay in the loan long enough to recover the closing costs. This calculator finds your break-even month — the point where the money you save each month finally cancels out what you paid to refinance — and your total lifetime savings over the remaining term.
How it works
The tool computes two monthly payments with the standard amortization formula:
M = P * r * (1 + r)^n / ((1 + r)^n - 1)where P is the loan balance, r is the monthly rate (annual rate / 12) and n is the number of months. When the rate is 0, the payment is simply P / n.
It then works out three figures:
- Monthly savings = old payment minus new payment.
- Break-even months = closing costs divided by the monthly savings.
- Lifetime savings = monthly savings times the new term in months, minus the closing costs.
For Montana, refinance closing costs average about 2.4% of the loan (roughly $4,300 on a typical balance), which is the default the tool starts with. Montana has no real-estate transfer tax, so refinance closing costs are driven by title insurance and lender fees against rising home values.
Example
Take a Montana loan with a $320,000 balance and 27 years left at 7%, refinancing into a new 27-year loan at 6% with $4,300 in closing costs. The old payment is about $2,201/mo and the new one about $1,997/mo, a monthly saving of roughly $204. Dividing $4,300 by that saving gives a break-even of about 1 years 10 months (22 months total). Keep the loan past that point and you come out ahead — close to $61,879 over the full remaining term.
Notes
This is an estimate for planning only, not financial advice. The amortization math is exact, but real refinance costs in Montana depend on your lender, credit, county recording fees and title charges. The 2.4% closing-cost figure is a statewide average — get a Loan Estimate from a licensed Montana lender for your actual numbers, and remember that a longer new term can increase total interest even when it lowers the monthly payment.