Mortgage Discount Points Explained: When Buying Down Your Rate Actually Pays Off

Mortgage shoppers often see two numbers quoted side by side: an interest rate and a dollar or percentage figure labeled "points." Discount points are a way to prepay interest upfront in exchange for a lower rate over the life of the loan. They can meaningfully reduce the total cost of a mortgage, but only if the borrower keeps the loan long enough for the math to work in their favor.

What a Point Actually Costs and Buys

One discount point equals 1% of the loan's principal amount. On a $400,000 mortgage, one point costs $4,000, paid at closing. In exchange, the lender reduces the interest rate, though the exact reduction varies by lender, loan type, and market conditions. A common industry rule of thumb is that one point lowers the rate by roughly a quarter of a percentage point (0.25%), but this is not fixed; lenders set their own pricing grids, and the trade-off can be smaller or larger depending on the day and the loan program. Borrowers should ask each lender for the specific rate-to-points schedule rather than assume a standard conversion.

Points can be purchased in fractions, such as half a point or a quarter point, and some loan estimates will show several rate-and-point combinations so borrowers can compare options side by side. Federal rules require lenders to disclose points clearly on the standardized Loan Estimate and Closing Disclosure forms, which the Consumer Financial Protection Bureau (CFPB) oversees under the TILA-RESPA Integrated Disclosure rule.

The Break-Even Calculation

The central question for any borrower considering points is simple: how long until the monthly savings add up to more than the upfront cost? The basic formula is break-even months equals the dollar cost of the points divided by the monthly payment savings the lower rate produces.

• Example setup: $4,000 paid for one point reduces the monthly principal-and-interest payment by $60.
• Break-even calculation: $4,000 divided by $60 equals roughly 67 months, or about 5.5 years.
• Decision rule: if the borrower expects to keep the loan (not sell or refinance) past the break-even point, buying points can reduce total interest paid. If they expect to move or refinance sooner, the points may never pay off.

This calculation ignores the time value of money and taxes for simplicity, but it is the starting point lenders and housing counselors typically use. Borrowers should also factor in opportunity cost: cash spent on points cannot be invested elsewhere or used to reduce the loan-to-value ratio, which can affect mortgage insurance requirements.

Tax Treatment: Purchase Loans vs. Refinances

The Internal Revenue Service treats points differently depending on whether the loan is for a home purchase or a refinance, a distinction detailed in IRS Publication 936, Home Mortgage Interest Deduction.

• Purchase-money mortgages: points paid to buy a primary or qualifying second residence are generally deductible in full in the year paid, if several IRS conditions are met, including that the points are a customary charge in the area, the loan is secured by the home, and the amount wasn't financed into the loan itself.
• Refinance loans: points paid to refinance an existing mortgage usually must be deducted ratably (spread out) over the life of the new loan, rather than all at once, unless the refinance proceeds are used for home improvements, which can qualify for different treatment.
• Itemizing required: the points deduction is only available to taxpayers who itemize deductions on Schedule A rather than taking the standard deduction, which the Tax Cuts and Jobs Act significantly raised, reducing the share of filers who itemize.

Because tax rules are fact-specific, borrowers with questions about their own situation should consult IRS Publication 936 directly or a qualified tax professional; this article is informational and not tax advice.

The Flip Side: Lender Credits and Negative Points

Points work in both directions. Instead of paying upfront for a lower rate, borrowers can accept a higher rate in exchange for a lender credit, sometimes called negative points, that offsets closing costs. This can make sense for buyers who are cash-constrained at closing or who plan to sell or refinance within a few years, since it avoids paying for a rate reduction they won't hold long enough to benefit from.

Discount points are neither inherently good nor bad. They are simply a way to shift cost between upfront cash and ongoing interest. For borrowers confident they will hold a mortgage for many years, points can lower lifetime borrowing costs. For those expecting a shorter stay, keeping cash at closing and accepting a slightly higher rate is often the more economical path. Running the specific numbers for each loan offer, rather than relying on rules of thumb, is the only reliable way to tell which strategy fits a given situation.