When Mortgage Points Pay Off: The Holding-Period Math
Mortgage points pay off only when your holding period exceeds the break-even month. Compute break-even as points cost divided by monthly savings, then stress-test it: a refinance resets the clock to zero, a move forfeits the remainder, and a rate drop after you buy points is the classic trap. Buy points only when your honest holding period clears break-even with margin.
Every discussion of mortgage points eventually arrives at the same uncomfortable truth: points are a bet on your own future. The math is certain, but the holding period is a guess, and the guess is where buyers win or lose. This guide shows how to do the holding-period math and how to stress-test it against the ways real life breaks plans.
The core equation
Break-even in months equals the upfront cost of the points divided by the monthly payment savings. A $4,000 point purchase saving $66 per month breaks even at about 60 months. Before month 60, you are still repaying the $4,000. After month 60, each month banks $66 of genuine savings. Over a full 30-year term, that example saves roughly $19,800 in interest net of the points cost. The equation is simple; the input that matters is how many months you will actually keep the loan.
The refinance trap
Refinancing is the classic points killer. Suppose you buy points with a 60-month break-even, and 30 months in, rates fall a full percentage point. Refinancing would save you far more than the remaining points ever will, so you refinance, and the unrecovered $2,000 of points cost evaporates. You made the right call to refinance, but the points turned into a donation to your old lender. This is why points are most dangerous when bought at rate peaks: the likeliest future is the one where refinancing becomes attractive, which is exactly the future where points lose.
The moving trap
Moving works the same way. Job changes, growing families, divorces, and unexpected opportunities all end loans early. National data shows the median homeowner tenure is roughly a decade, which sounds safe for a 5-year break-even, but medians hide enormous variation, and first-time buyers move sooner than the median. If there is any meaningful chance you move within the break-even window, price the points as a gamble, not an investment.
Stress-testing your break-even
Run three scenarios before deciding. The base case uses your honest best guess of the holding period. The pessimistic case assumes you refinance or move two years earlier than expected. The optimistic case assumes you stay the full term. Points should win clearly in the base case and still look acceptable in the pessimistic case. If they only win when everything goes right, pass. Also test the rate-reduction input: if your lender offers 0.20% per point instead of 0.25%, break-even stretches and the scenarios get worse.
Points on ARMs and short horizons
Adjustable-rate mortgages deserve special caution. A 5/1 ARM has a five-year fixed period, and many borrowers refinance or sell when it adjusts. Buying points with a 60-month break-even on a loan you will likely exit at month 60 is a coin flip at best. The same logic applies to anyone with a known short horizon: a planned relocation, an expected inheritance that will pay off the loan, or a starter home you will outgrow.
Building in margin
A practical rule: require your honest holding period to exceed break-even by at least 12 to 24 months. The margin covers the optimism bias in everyone's plans and the small chance that the rate reduction is slightly worse than quoted. If break-even is 60 months, want 72 to 84 months of realistic tenure before you buy. Without that margin, keep the cash for the down payment, the emergency fund, or the moving truck.
The bottom line
Points reward certainty about the future and punish surprises. Since the future is the one input you cannot verify, demand margin. Run the calculator at the top of this page, write down your three scenarios, and only buy the points if the pessimistic one still works.
Modeling the rate-drop scenario
The nightmare scenario for points buyers deserves its own spreadsheet row: rates fall 1.5% eighteen months after you buy points. Model it explicitly. Without points, you refinance at month 18 into the lower rate and your total cost is 18 months of the higher payment plus refinance closing costs. With points, you paid $4,000 upfront, enjoyed 18 months of slightly lower payments, and then refinance anyway, abandoning most of the points' value. The points buyer loses by roughly the unrecovered points cost minus the small payment savings banked. This scenario is not rare; it is the normal shape of rate cycles. If you are buying at what looks like a rate peak, with economists discussing cuts, weight this scenario heavily.
Points and the time value of money
Strictly speaking, break-even should account for the time value of money: $4,000 today is worth more than $4,000 of payment savings spread over five years, because today's dollars could earn interest. Discounting the savings at a modest rate, say 4%, pushes the true break-even a few months past the simple division result. In practice the adjustment is small relative to the uncertainty in your holding period, so the simple break-even remains the right tool, but understand its bias: it slightly flatters points. If your break-even is 60 months simple, think of it as 63 to 65 months economic, and demand your holding-period margin accordingly.
Documenting your holding-period assumption
Because the holding period is a guess, write it down with its reasoning: job stability, school plans, family size, and how long you have stayed in past homes. Revisit the note annually. If circumstances change, a job offer across the country in year three, you can reassess whether a refinance now beats riding out the points. Buyers who documented a seven-year plan and face a move in year three can at least quantify the sunk cost instead of guessing. The note also disciplines the original decision: writing I will keep this loan eight years because my kids start school here forces more honesty than a vague feeling of staying a while.
Data current as of October 2026. Rate math follows standard amortization; tax notes follow IRS Topic 504. Verify current point pricing with your lender.