Mortgage Points: The Break-Even Math Behind Buying Down Your Rate

On a $400,000 mortgage, one discount point costs $4,000 and typically trims the rate by about a quarter of a percentage point. Whether that trade is smart or a donation to your lender comes down to one number: how many months you keep the loan. This guide works that number out, then maps the situations where points earn their keep and the ones where they quietly never do.

Two very different things are called "points"

Discount points are prepaid interest: each point costs 1% of the loan amount and buys a permanently lower rate, commonly around 0.25 percentage points per point, though the menu varies by lender and by day. Origination points are simply a fee for making the loan, expressed in the same units, and they buy you nothing. The distinction matters because both show up in the same section of your loan estimate, inside closing costs. Discount points are an investment you can evaluate; origination points are a price you can shop against other lenders. Everything below is about the first kind.

A third cousin sometimes muddies the water: the temporary buydown (marketed as "2-1" or "1-0"), where the rate drops for the first year or two and then snaps back to the full note rate. That is a prepaid subsidy, usually seller- or builder-funded, not a permanently lower rate, and the break-even math below does not apply to it. When a quote mentions points, the first clarifying question is always: permanent or temporary?

The break-even framework, worked out

The structure of the decision is always the same: pay a known amount today, receive a known saving every month, and find the month where the savings have repaid the cost. Take that $400,000 loan on a 30-year term:

Five years to break even, and every month after that is $67 of pure gain: keep the loan the full 30 years and the point returns roughly $24,000 of avoided interest on a $4,000 outlay. Sell or refinance in year three and you paid $4,000 for about $2,400 of savings. The asymmetry is the whole decision. Your own numbers will differ with the loan size, the rate menu, and fractional points (half and quarter points are common), which is what the mortgage points calculator is for: it computes the break-even month for any quote you are holding.

One refinement worth knowing: a point paid today is worth slightly more than the raw division suggests if you would otherwise invest that cash, and slightly less if buying points drains the emergency fund. The break-even month is a floor for your required holding period, not a precise forecast.

When points win

• You will keep the loan well past break-even. A forever home with no move on the horizon is the classic case. Doubling the break-even period is a reasonable margin of safety: a 60-month break-even wants a stay closer to ten years.
• A refinance looks unlikely. Points buy a rate for the life of this loan. If rates fall enough that refinancing makes sense, the unamortized value of your points evaporates with the old loan. Buying points is, in part, a bet that rates will not drop; the refinance calculator shows how big a drop would trigger that bet's losing side.
• The cash is genuinely spare. After the down payment, closing costs, moving, and an intact emergency fund. Points bought with money that was protecting you from a bad month are mispriced insurance.
• A seller or builder is paying. Credits earmarked for closing costs often can fund a rate buydown, converting a one-time concession into a 30-year discount. Same math, but the upfront cost is someone else's.

When points lose

Short expected stays, starter homes, jobs with relocation risk, and high-rate markets where refinancing within a few years is plausible: in all of these the break-even month tends to arrive after the loan is already gone. Points also lose to better uses of the same cash, and there are usually several: a larger down payment that removes mortgage insurance, paying off a high-rate card, or simply keeping the buffer that makes homeownership survivable. A useful tax note, without numbers: discount points on a purchase are often deductible as mortgage interest for those who itemize, which softens their cost somewhat, but a deduction is a discount on the price, never a reason to buy.

The negotiating context lenders skip

Points are a menu, not a fixture. Every lender can quote the same loan at several rate-and-point combinations, including lender credits, which are negative points: a higher rate in exchange for cash toward closing, the exact mirror of a buydown, useful when cash is tight and the stay may be short. Two practices keep the comparison honest. First, collect quotes at zero points from every lender on the same day, so you can see the real base rates before anyone dresses them up. Second, compare offers by APR, which folds points and fees into a single annualized cost; a headline rate that undercuts the competition purely by loading on points shows up immediately as an APR that does not. A quoted rate is an opening position, and points are one of the few closing costs that are entirely, transparently negotiable.

One line in a much longer ledger

The buy-or-skip decision on points moves your housing cost by tens of dollars a month for decades, which is exactly the kind of slow, compounding difference that is easy to lose track of. Stoia keeps the mortgage, the equity building behind it, and everything else you own in one picture, so the long-game decisions stay visible long after closing day.