Calculadora de mortgage points

Mortgage Points Are a Prepaid Interest Decision

Mortgage points let you pay more upfront in exchange for a lower interest rate. A standard discount point usually costs 1% of the loan amount. On a $425,000 mortgage, one point costs $4,250. The idea is simple: you prepay some of the interest now to reduce the monthly payment and the total interest paid over time.

The important question is not whether points lower the rate. They do. The real question is whether the upfront cost pays back fast enough for your situation. If you keep the mortgage long enough, points can be a smart move. If you sell, refinance, or pay off the loan early, you may never recover the upfront cost.

This calculator compares the no-points payment to the buydown payment, estimates the monthly savings, and shows the break-even period in months. That break-even line is usually the most practical decision tool because it translates abstract rate math into one clean planning question: will I realistically keep this loan long enough for points to win?

How Mortgage Points Are Calculated

Point cost = Loan amount × Points purchased

New rate = Base rate − (Points × Rate reduction per point)

Break-even months = Upfront point cost ÷ Monthly payment savings

Example: if you borrow $425,000 at 6.75% for 30 years and buy 1 point that lowers the rate by 0.25%, the point costs $4,250 and your new rate becomes 6.50%. Your monthly payment falls, and the difference between the old payment and new payment determines how long it takes to earn back the $4,250.

That break-even result is the number you should compare against your likely hold period. If you expect to keep the loan for 8 years and the break-even period is 4 years, the purchase may make sense. If you expect to refinance in 18 months, points are usually a poor trade.

When Buying Points Usually Makes Sense

• You expect to keep the mortgage for a long time: longer hold periods improve the case for points.
• You want lower required monthly payments: points can reduce fixed housing costs permanently for that loan.
• You have enough cash after closing: the buy-down only works if it does not weaken reserves.
• The buydown price is fair: some lenders offer more attractive rate reductions per point than others.

The strongest case for points is often a stable homeowner buying a long-term primary residence who wants predictable payment savings and does not expect to refinance soon. The weakest case is a borrower who is already stretching to close and might need to refinance, move, or sell within a short window.

When Points Usually Do Not Make Sense

Points are often a bad fit when cash is tight or your timeline is uncertain. Every extra dollar paid for points is a dollar you cannot use for reserves, repairs, moving costs, or higher-interest debt reduction. If buying points drains liquidity, the lower payment may not be worth the loss of flexibility.

The other big issue is loan duration. Borrowers commonly overestimate how long they will keep the original mortgage. A future refinance, home sale, or relocation can erase the expected benefit. If your break-even is 52 months and you refinance in 24 months, the points purchase lost money even though the payment was lower the entire time.

That is why the practical framework is: keep cash reserves first, then evaluate points only if the break-even period fits comfortably inside your likely mortgage horizon.

Worked Example

Take a $425,000 loan over 30 years at 6.75%, with 1 point purchased and an assumed 0.25% rate reduction per point. The point costs $4,250. The monthly payment at 6.75% is higher than the monthly payment at 6.50%. Suppose the reduction saves roughly $70 to $75 per month. The break-even period then lands around 57 to 61 months.

That means the points purchase only starts helping after roughly 5 years. If you expect to stay in the home and keep the mortgage for 10 years, it may be worthwhile. If you are uncertain beyond 3 years, the upfront spend is usually harder to justify.

This is also why two seemingly similar offers can be very different. A lender offering a stronger rate reduction per point can produce a meaningfully faster break-even, while a weak buydown structure can turn points into expensive decoration.

Points vs Larger Down Payment vs Closing-Cost Credits

Mortgage points are only one use of cash at closing. That same money could increase your down payment, reduce your loan size, preserve reserves, or offset other closing costs. In some cases, taking a slightly higher rate in exchange for lender credits is better if it protects cash. In other cases, the payment savings from points beat the alternatives.

A good comparison looks at what the cash could do elsewhere. If using the same $4,250 as extra down payment barely changes the monthly payment, points may create more payment benefit. If your emergency fund is thin, keeping the cash can be smarter than either option. If you are carrying high-interest credit-card debt, paying that down may dominate both.

The right answer is not “always buy points” or “never buy points.” It is “buy points only when that use of cash is stronger than the realistic alternatives.”

How Lenders Price Points in the Real World

Points are not a universal commodity with one exact market exchange rate. One lender may charge 1 point for a 0.25% rate reduction, while another may charge the same point cost for a smaller improvement, or may pair the same rate with different lender fees elsewhere in the estimate. That is why borrowers should compare the full loan estimate rather than assuming “one point always equals the same deal.”

This is also where break-even analysis becomes especially useful. If one offer gives materially better monthly savings for the same upfront point cost, the shorter break-even period makes the stronger deal obvious. If two offers look close, the tie-breaker is often liquidity and timeline: the better paper math can still be the worse choice if it leaves you too cash-tight after closing.

The practical takeaway is simple: price the points, measure the savings, and compare that result to at least one no-points alternative. The no-points quote is the baseline that keeps the buy-down decision honest.

Common Mistakes

• Ignoring break-even: a lower rate is not automatically a good deal if the upfront cost takes too long to recover.
• Assuming every point buys the same rate drop: lender pricing varies.
• Overstretching cash at closing: payment savings are not worth becoming cash-poor.
• Forgetting refinance risk: future rate changes can shorten your actual loan horizon.
• Comparing only rate, not total deal structure: lender fees, credits, and APR all matter.

The cleanest mortgage-points decision is usually made with three numbers side by side: upfront point cost, monthly savings, and break-even months. If those numbers still look attractive after a conservative timeline check, the buy-down may be worth it.

For cautious borrowers, it helps to stress-test the result with a shorter hold period than the one you hope for. If the decision only works when everything goes perfectly and you keep the mortgage much longer than average, it is probably too fragile. If it still works under a shorter timeline, the case for points is much stronger.