Mortgage Points Calculator

What this calculator is, and when to reach for it

Discount points are the mortgage market’s way of letting you buy a lower interest rate with cash. One point costs one percent of the loan and typically shaves a fraction off the rate for the life of the loan. It is, in effect, prepaid interest: you hand over money today in exchange for paying less every month afterwards.

That makes it one of the few genuinely clean financial trades in a property purchase, because it reduces to a single question with a numerical answer. How long will you keep this loan? Everything else follows. Below the break-even period you have simply given money away; beyond it, every month is profit.

What makes points interesting rather than obvious is that the break-even is usually longer than people expect — commonly around five years — and that most borrowers do not keep a mortgage anything like that long. Points are therefore right for a minority of buyers and quietly wrong for a large number of the people who buy them.

Use this page when points are offered, when a lender presents two versions of the same loan at different rates and fees, or whenever you have spare cash at completion and are wondering whether it is better spent buying the rate down or increasing your deposit.

Points, credits, and the same lever in reverse

The trade runs in both directions. Discount points mean paying cash for a lower rate. Lender credits, sometimes called negative points, mean accepting a higher rate in exchange for the lender covering some of your costs. The arithmetic is identical, with the signs reversed.

That symmetry is useful, because it reframes the decision. Points suit someone with surplus cash and a long horizon. Credits suit someone short of cash at completion or unsure how long they will stay. Neither is inherently better, and a borrower who takes credits is not making a mistake — they are buying flexibility with money.

Do not confuse discount points with origination points, which are a fee for processing the loan and buy you nothing at all. Both appear as a percentage of the loan and the language is deliberately similar. Only discount points reduce the rate.

Where to go next

Points are effectively a fee attached to one offer, so the mortgage comparison calculator is the natural next step for judging two loans that differ in both rate and cost. On a refinance, the break-even calculator applies the same recovery logic to the whole transaction.

To see the payment each rate produces including tax and insurance, use the mortgage calculator, and the amortization calculator shows how a lower rate changes the shape of the loan rather than just its cost. The mortgage APR calculator shows how points feed into the APR figure lenders disclose.

Before committing cash to points, compare the alternative uses. The down payment calculator and loan to value calculator show whether the same money would do more by crossing a lender threshold, and the extra payment calculator shows what it would achieve applied to the balance instead.

How the trade is worked out

Two payments are calculated, the cost is divided by the difference, and the result is a number of months.

point cost = loan × 1% × points   |   break-even months = point cost ÷ monthly saving

points

how many points you buy, often available in fractions

monthly saving

the payment at the base rate less the payment at the bought-down rate

How much rate a point buys

There is no fixed exchange rate. A point commonly reduces the rate by something in the region of a quarter of a percentage point, but the ratio varies by lender, by product, by market conditions, and by how many points you buy. Lenders publish a schedule, and it is worth asking for it in full rather than accepting a single quoted option.

Because the ratio varies, the only reliable approach is to price the specific offer in front of you. A point that buys a large rate reduction can be excellent value; the same point buying a small reduction can be poor value, and the label does not distinguish them.

Why the break-even is longer than it feels

The cost is large and immediate; the saving is small and spread over decades. On a substantial loan, a point costs thousands while saving tens of pounds or dollars a month, so recovery takes years even when the trade is ultimately profitable.

A useful sanity check is that the break-even period is roughly independent of loan size. Doubling the loan doubles both the point cost and the monthly saving, so the ratio between them barely moves. This means the decision is almost entirely about your horizon and hardly at all about how much you are borrowing.

The cost of the money you hand over

The simple break-even ignores what that cash could have done elsewhere. Money spent on points cannot be invested, cannot sit in an emergency fund, and cannot go toward your deposit — and that last option is frequently the strongest competitor.

If a few thousand would take your deposit across a lender threshold, it may reduce your rate anyway, remove mortgage insurance, and improve every future refinancing option. That combination usually beats buying points outright, and it is worth checking before spending the money on rate.

What ends the bet early

Selling, refinancing, or paying off the loan all stop the saving and none of them refund the points. Refinancing is the underrated risk: if rates fall meaningfully, you will want to refinance, and points bought on the old loan are simply gone.

This makes points a bet on two things at once, that you will stay put and that rates will not fall far enough to tempt you away. In a period when rates are expected to decline, the second condition is doing quiet damage to the case even if the first holds.

What this page assumes

The calculator compares two fixed-rate repayment schedules and subtracts the upfront point cost from the payment and interest difference.

One discount point equals 1% of loan principal; point cost is paid upfront and is not financed.

Worked examples, step by step

Take a 350,000 loan over thirty years with a base rate of 6.5%, giving a payment of 2,212.24. The lender offers a quarter point of rate reduction per point bought.

What each level of points buys

Both options break even at almost exactly the same point, a shade over five years. That consistency is typical when a lender prices points on a straight line, and it means the decision is not about how many points to buy but whether to buy any at all.

Over a seven-year horizon, one point nets 1,307 and two points net 2,560. Real, but modest against the cash committed. Held for the full thirty years, one point returns 17,102 and two return 33,972 — which is where the case becomes compelling, and also where it becomes least realistic.

The horizon decides everything

A buyer who stays four years loses money on both options, having paid 3,500 to save roughly 2,747. A buyer who stays ten years is comfortably ahead. The loan, the lender, and the rate are identical in both cases; only the borrower differs.

This is why the honest first question is not "are points worth it?" but "how long will I keep this mortgage?" If the answer is under five years, or genuinely uncertain, the arithmetic has already decided. If it is comfortably over, points deserve serious consideration alongside the alternative of a larger deposit.

The vocabulary, on and around this page

Discount point

An optional up-front payment of one percent of the loan that reduces the interest rate for the life of the loan. Effectively prepaid interest.

Origination point

A fee charged for processing the loan, also quoted as a percentage. It buys no rate reduction and should not be confused with a discount point.

Lender credit

The reverse trade, where accepting a higher rate has the lender cover some of your costs. Sometimes called negative points.

Break-even period

How long the monthly saving takes to repay the cost of the points. Below it the purchase loses money; beyond it, it gains.

Buy-down

Reducing the interest rate by paying cash up front. A permanent buy-down lasts the whole term.

Temporary buy-down

An arrangement reducing the rate only for the first year or two before it reverts. It is a different product from discount points.

Note rate

The rate the payment is calculated from. Points reduce this figure directly.

APR

A comparison figure combining rate and certain costs, including points. Buying points lowers the rate but the points themselves raise the APR calculation.

Par rate

The rate offered with no points paid and no lender credit taken. It is the baseline the trade is measured against.

Rate sheet

A lender’s schedule showing what each level of points or credits does to the rate. Worth requesting in full rather than accepting one option.

Fractional points

Buying part of a point, such as a half or a quarter. Most lenders allow it, which makes the trade more granular than it first appears.

Horizon

How long you expect to keep the loan. It is the single fact that decides whether points pay off.

Opportunity cost

What the cash spent on points could have achieved elsewhere, such as a larger deposit or an emergency fund.

Prepaid interest

Interest paid in advance rather than over time. Points are economically a lump sum of interest paid at the start.

Loan to value

The loan as a percentage of the property value. Using cash to improve it can beat spending the same cash on points.

Mortgage insurance

A premium required below certain deposit levels. Avoiding it with the same cash is often a stronger use than buying rate.

Refinance risk

The chance that falling rates make refinancing attractive, ending the saving early while the points paid are not refunded.

Seller concession

An amount a seller contributes toward buyer costs, which can sometimes be applied to points rather than paid from your own funds.

Total interest

All interest across the life of the loan. Points reduce it, but only if the loan is held long enough to realise the saving.

Amortization

How the loan repays over time. A lower rate shifts more of each payment to principal from the very first month.

Common mistakes, and what this page will not do

• Confusing discount points with origination points. Both are quoted as a percentage of the loan, but only discount points reduce your rate. Origination points are a processing fee and buy nothing.
• Buying points with an uncertain horizon. Break-even commonly falls around five years. If you are unsure how long you will stay, the arithmetic already favours not buying.
• Ignoring the risk of refinancing. If rates fall and you refinance, the saving stops and the points are not refunded. Points are a bet on rates as well as on staying put.
• Spending on points when the deposit is close to a threshold. The same cash may lower your rate anyway, remove mortgage insurance, and improve future options. Check that comparison first.
• Assuming a point always buys the same rate reduction. The ratio varies by lender and product. Price the specific offer rather than relying on a rule of thumb.
• Accepting a single quoted option. Lenders hold a full schedule including fractional points and credits. Ask for it; the option you are shown is not always the best one available.
• Emptying reserves to buy rate. Points are irreversible and illiquid. Completing with no accessible savings is a poor trade for a modest monthly reduction.
• Judging the case on the lifetime saving. The thirty-year figure is the most flattering and the least likely to be realised. Judge on the horizon you actually expect.
• Overlooking lender credits when cash is tight. The reverse trade exists. Accepting a slightly higher rate to have costs covered can be the right answer for a short or uncertain stay.

What this calculator leaves out: This calculator does not model tax treatment of points or mortgage interest, account for the opportunity cost of the cash spent, predict rate movements or refinancing, distinguish lender-specific rate sheets, or include temporary buy-down structures. It compares two fixed-rate payments from the figures you enter.

Frequently asked questions