Mortgage Points and Rate Buydown

A mortgage point is 1% of a loan’s principal amount, paid as an upfront fee to lower the interest rate. One point on a $300,000 mortgage costs $3,000 and typically reduces the rate by 0.25% to 0.5%. The trade-off—spending cash now to save interest later—only pays off if you remain in the home long enough to recover your upfront cost.

The mechanics of points

A mortgage lender sets a baseline interest rate for your loan term. That rate depends on the broader market, your credit, your down payment, and your loan-to-value ratio. Once the lender has quoted you a baseline rate—say, 6.5% on a 30-year fixed mortgage—you can buy down that rate by paying an upfront fee: a “discount point.”

The math is simple. A point costs 1% of the loan principal. On a $300,000 mortgage, one point costs $3,000. Two points cost $6,000. The rate reduction varies by lender and market conditions, but a common rule of thumb is that one point reduces the rate by 0.25% to 0.5%. If your baseline rate is 6.5% and you pay one point for $3,000, your new rate might be 6.25%.

This is, in essence, prepaid interest. You are paying the lender cash today in exchange for a lower rate (and thus lower interest payments) over the life of the loan. The lender benefits because they receive a lump sum immediately. You benefit because your monthly payment is lower—but only if you stay long enough to offset the upfront cost.

The break-even calculation

The key question: does it pencil out? Suppose your loan is $300,000 at 6.5% for 30 years. Your monthly payment is roughly $1,896. Now suppose you pay $3,000 (one point) to drop the rate to 6.25%. Your new payment is roughly $1,848—a savings of $48 per month.

Dividing the upfront cost by the monthly saving: $3,000 ÷ $48 = 62.5 months, or about 5.2 years. This is your break-even point. If you stay in the home for six years, you will have recovered your $3,000 and started to profit from the lower rate. If you sell after three years, you will never recover it; the savings are swallowed by the upfront cost.

This break-even period is crucial. The national average homeownership duration is between 5 and 7 years. Many people stay longer; many shorter. If you are relocating for work in two years, points are almost certainly a bad investment. If you plan to retire in the home and stay 25 years, points become attractive.

When points make sense

Points are most valuable when: (1) you have a long holding period in the home (8+ years), (2) you can afford the upfront cost without compromising your down payment or emergency savings, (3) interest rates are high and rate reduction is marginal cost-effective, or (4) you are refinancing and the upfront cost is small relative to the rate drop.

Points are least valuable when: (1) you have a short time horizon (under 5 years), (2) you are stretching financially to buy the home and every dollar matters, (3) interest rates are already historically low, or (4) you expect to refinance soon (because refinancing cancels out the value of points paid on the original loan—they don’t transfer to the new loan).

Origination points versus discount points

There are two types of points: origination points and discount points. Origination points are fees charged by the lender for processing and underwriting the loan. They do not lower the rate; they are simply a cost of borrowing, usually 0.5% to 1% of the loan amount. You pay these whether you are buying down the rate or not.

Discount points are what most people mean when they talk about “buying down the rate.” They are optional and directly reduce the interest rate. You can choose to pay zero discount points (and accept the baseline rate), or one, two, or even three points depending on what the lender offers.

Tax treatment

Discount points on a mortgage used to buy or build a primary residence are tax-deductible as mortgage interest. You can deduct them in the year the mortgage is taken out, or you can amortise them over the life of the loan. For a $300,000 30-year mortgage with one point ($3,000), you could either deduct $3,000 in year one or deduct $100 per year for 30 years (if amortisation is more beneficial under your tax situation).

Points on a rental property or investment property are not deductible in the year paid; they must be amortised. Points paid when refinancing are also amortised over the new loan term. This tax treatment can affect the break-even calculation, especially for borrowers in higher tax brackets who benefit more from the deduction.

Comparing points to no-point mortgages

The choice is binary: pay points now or accept a higher rate with no upfront cost. A lender will always offer you a rate ladder: 6.5% with zero points, 6.25% with one point, 6.0% with two points, and so on. You are choosing where on that ladder to sit.

In a low-rate environment, the rate reduction per point may be small (0.1% or 0.2%), making break-even periods very long—10+ years. In a high-rate environment, the reduction may be larger (0.4% or 0.5%), making points more attractive to borrowers who plan to stay. There is no universal right answer; it depends on rates, your time horizon, your financial flexibility, and your tax situation.

Points and refinancing

Here is a critical trap: if you pay points to buy down your mortgage and then refinance five years later, the points vanish. The original lender keeps them. You start from scratch with the new lender. This is why financial planners advise caution with points if refinancing is a possibility.

Suppose you pay $6,000 in points to reduce your 30-year mortgage from 6.5% to 6.0%. You break even after eight years. But in year five, rates drop and you refinance. Your $6,000 in points is sunk; the new lender sees a new loan with a new baseline rate and you must decide afresh whether to buy points on the new loan. You never benefited from the original points.

This underscores the core trade-off: points are a bet that you will stay long enough (and that rates will not drop so much that refinancing is tempting). For borrowers who expect to be in their home for 10+ years and rates are not at historical lows, points often make sense. For others, they are usually a waste of cash.

See also