Mortgage Discount Points
Cost of buying discount points and the break-even on the lower rate.
Cost of points
$3,000.00
1 point(s) at $3,000.00 each
Monthly saving
$50.11
New rate
6.75%
Break-even
60 months
Break-even (years)
5
AI Breakdown & Smart Takeaway
Plain-English insight on your numbers
Get a personalized explanation of what these results mean — and how to improve them.
How the Mortgage Discount Points works
The Mortgage Discount Points Calculator helps homebuyers and refinancers determine exactly how much it costs to buy down their interest rate and how long it takes for those upfront savings to pay off. It's ideal for anyone comparing loan offers or deciding whether paying points makes financial sense given their expected time in the home.
When you take out a mortgage, lenders typically give you the option to pay discount points at closing in exchange for a permanently reduced interest rate. Each point equals 1% of your loan amount — so on a $400,000 mortgage, one point costs $4,000. The rate reduction you receive per point varies by lender and market conditions, but a common rule of thumb is roughly 0.25% per point, though this can range from 0.125% to 0.375%. This calculator takes your loan amount, original rate, bought-down rate, and the cost of the points, then maps out exactly what you're paying and what you're saving.
The core output of this tool is the break-even period — the number of months it takes for your monthly payment savings to fully recoup the upfront cost of the points. For example, if buying one point costs $4,000 and reduces your monthly payment by $80, your break-even is 50 months, or just over four years. If you plan to stay in the home or keep the loan beyond that point, buying down the rate is a net financial win. If you sell, refinance, or pay off the loan before the break-even, you've effectively overpaid. This makes your expected loan duration the single most critical variable in the decision.
The calculator also accounts for the opportunity cost of your upfront cash. Money paid in points is money that could have been invested, put toward a larger down payment to eliminate PMI, or kept as an emergency fund. Some advanced analyses discount future monthly savings to present value to get a more precise return-on-investment figure. While this calculator focuses on the straightforward nominal break-even, savvy borrowers should mentally compare the point cost against what a conservative investment of that same cash might return over the same period.
A common mistake borrowers make is evaluating points in isolation rather than comparing total loan costs across multiple offers side by side. A lender offering a low rate with heavy required points may actually be more expensive than a lender offering a slightly higher rate with no points, especially for shorter holding periods. Always input each competing offer into the calculator separately and compare break-even timelines. Also watch for negative points (lender credits), which work in reverse — the lender raises your rate slightly in exchange for a cash credit at closing that covers some of your closing costs.
Formula
Cost = loan × points%. Break-even = cost ÷ monthly payment saving
Pro tips
- Only consider buying points if you're confident you'll keep the loan past the break-even period — as a rule of thumb, points rarely make sense if you expect to move or refinance within five years.
- Ask your lender for a 'points vs. rate' table showing multiple combinations, then run each scenario through the calculator to find the option with the best break-even relative to your timeline.
- In a high-rate environment, buying points can be especially valuable because the absolute dollar difference in monthly payments is larger, shortening your break-even period.
- Remember that points paid on a primary residence purchase mortgage are generally tax-deductible in the US in the year paid — consult a tax advisor, as this effectively reduces the real cost of the points and shortens your true break-even.
- If you're on the fence between using extra cash for points versus a larger down payment, calculate whether eliminating PMI (if applicable) might deliver a faster payoff than rate buydown — sometimes the PMI elimination wins.
Key terms
- Discount Points
- — Prepaid interest paid at closing to permanently reduce the mortgage interest rate, with each point equal to 1% of the loan amount.
- Buy Down Rate
- — The process of lowering your mortgage's interest rate by paying discount points upfront, resulting in reduced monthly payments for the life of the loan.
- Break-Even Period
- — The number of months it takes for cumulative monthly payment savings from a lower rate to equal the upfront cost of the discount points paid.
- Origination Points
- — Fees charged by the lender to cover the cost of processing the loan, distinct from discount points and not tied to a rate reduction.
- Lender Credits (Negative Points)
- — The opposite of discount points — the lender raises your interest rate slightly in exchange for providing cash at closing to offset your closing costs.
- Effective Interest Rate
- — The true cost of borrowing after accounting for the upfront cost of points spread over the actual period you hold the loan.