By the end of this guide you will know how to run a mortgage points buydown calculator, find your break-even month, and decide whether paying discount points fits how long you expect to keep the loan. Have three things ready: a Loan Estimate or rate quote (loan amount, rate, term), your realistic time in the home, and about 15 minutes.
By Duane Buziak, NMLS #1110647, the Mortgage Maestro. All rates below are hypothetical illustrations, not quotes.
Step 1: Gather the Numbers a Buydown Calculator Needs
A permanent rate buydown calculator needs only a handful of inputs:
- Loan amount: the amount you borrow, not the purchase price.
- Term: 30 years, 15 years, and so on.
- Note rate at zero points (often called the par rate).
- Cost of one point: 1% of the loan amount, so $4,000 on a $400,000 loan.
- The lower rate offered for that point, and ideally for two points as well.
Property taxes, homeowners insurance, and mortgage insurance are not needed for the buydown math. They do not change when the rate changes, so leave them out.
Pull the figures from a Loan Estimate where you can. On page 2, Section A (Origination Charges) shows any points as a percentage of the loan amount and a dollar figure. The CFPB’s Loan Estimate explainer walks through each section. Watch for a credit shown further down the page: a lender credit is the opposite of a point, because you accept a higher rate in exchange for the lender covering some costs.
Terms to keep straight
- Discount points: optional prepaid interest, 1% of the loan each, that typically lowers your rate. The size of the drop varies by lender, day, and loan type. It is not a fixed 0.25% per point.
- Origination points: a fee the lender charges for originating the loan. It does not buy a lower rate.
- Lender credits: money toward closing costs in exchange for a higher rate.
- Temporary buydown (such as 2-1): lowers the rate only for the first year or two. The permanent math in this guide does not apply to it, because the savings end when the buydown does.
The most common mistake is plugging in a rate sheet “example” instead of a rate priced for your credit score, loan-to-value, and occupancy. Ask for quotes at zero, one, and two points, all on the same day, so you compare like with like.
Step 2: Calculate the Monthly Payment at Each Rate
Principal-and-interest (P&I) on a fixed-rate loan comes from the standard amortization formula: the loan amount times the monthly rate, divided by one minus the monthly discount factor (1 plus the monthly rate, raised to the negative number of payments). The monthly rate is the annual rate divided by 12. Nobody should do this by hand. Use a calculator, and use a second one to confirm the result.
Worked example (hypothetical rates)
Suppose you borrow $400,000 on a 30-year fixed loan. Assume a par rate of 6.50%, a rate of 6.25% for one point ($4,000), and 6.00% for two points ($8,000). These are made up for illustration. Real pricing changes daily and rarely drops in even steps.
- 6.50% (no points): P&I of $2,528.27
- 6.25% (1 point, $4,000): P&I of $2,462.87
- 6.00% (2 points, $8,000): P&I of $2,398.20
Compare P&I only. Taxes and insurance stay the same at every rate, so adding them just hides the difference you are trying to measure.
Buying one point saves $2,528.27 minus $2,462.87, or $65.40 a month. Buying two saves $130.07 a month. Those monthly savings are what Step 3 divides into your upfront cost.
Before you rely on any figure, run the same inputs through a second calculator. Differences of a few cents come from rounding. A gap of dollars usually means a wrong term or a rate typed as 6.5 instead of 6.50 in a field expecting a decimal.
Step 3: Find Your Break-Even Month
The formula is simple: total cost of the points divided by the monthly payment savings equals the number of months to break even.
Continuing the example, one point costs $4,000 and saves $65.40 a month: $4,000 ÷ $65.40 = about 61.2 months, so you recover the cost in month 62, roughly 5.2 years in. Two points cost $8,000 and save $130.07 a month: $8,000 ÷ $130.07 = about 61.5 months, also month 62.
Now test it against reality. Keep the loan 5 years (60 months) and one point returns $3,924 in savings against a $4,000 cost, a small loss. Keep it 7 years (84 months) and savings total $5,493.60, a net gain of $1,493.60. With two points, 84 months returns $10,925.88 against $8,000, a net gain of $2,925.88.
The break-even month only matters relative to how long you will actually hold this mortgage. That is not the same as how long you will live in the home. Two events end the loan early and forfeit any unrecovered points:
- A sale: a job move or growing family can cut your timeline short.
- A refinance: if rates fall and you refinance in year three, the points you paid on the first loan are gone.
One caution on the method. Basic break-even ignores the time value of money and the opportunity cost of the cash. Four thousand dollars invested or held as reserves is worth something, so treat the figure as an approximation. If your break-even is close to your expected timeline, the points are probably not worth the strain.
Step 4: Factor In Taxes, Cash Reserves, and Where the Money Comes From
Points are paid in cash at closing. That cash competes with your down payment, your post-closing reserves, and any minimum cash-to-close a program or underwriter expects. If paying points leaves you thin, a lower monthly payment is a poor trade for a shaky cushion.
Tax treatment
Points paid on a purchase of a primary residence may be deductible, but rules have conditions. IRS Publication 936 covers home mortgage interest and points. Confirm current rules and your own situation with a tax professional before counting a deduction in your math.
Seller concessions and credits
A seller may agree to contribute toward your costs, which can fund points. Programs cap those contributions. Fannie Mae’s interested party contribution rules in its Selling Guide set limits that depend on occupancy and loan-to-value, and other programs have their own limits. Check the current figures for your loan type, since they can change.
The opposite option: lender credits
Instead of buying the rate down, you can accept a higher rate in return for a credit against closing costs. That trades a larger monthly payment for less cash at the table. Duane Buziak often prices these as no-out-of-pocket closing options for buyers who would rather preserve cash. Run the same break-even logic in reverse: how many months of higher payments does it take to erase the credit you received? If you expect to move or refinance soon, the credit route can come out ahead.
Step 5: Compare Buydown Scenarios Side by Side
Put the three scenarios in one table so the trade-offs are visible. The figures continue the hypothetical $400,000, 30-year example from Step 2.
| Scenario | Upfront cost | Hypothetical rate | Monthly P&I | Monthly savings vs. par | Break-even |
|---|---|---|---|---|---|
| 0 points | $0 | 6.50% | $2,528.27 | None | Not applicable |
| 1 point | $4,000 | 6.25% | $2,462.87 | $65.40 | Month 62 |
| 2 points | $8,000 | 6.00% | $2,398.20 | $130.07 | Month 62 |
Choose the scenario whose break-even sits comfortably inside your expected holding period, with margin for a plan that changes. In this illustration, both paid options need over five years. If you are unsure you will keep the loan that long, zero points is a defensible answer.
Pricing per point is not universal. It varies by lender, loan program, and day, so the same point can buy different reductions at different shops. The Freddie Mac Primary Mortgage Market Survey publishes weekly average rates alongside average points, which gives general context. Check the current figure yourself, because it moves weekly.
This is where broker access matters. Different wholesale lenders lean toward different loan types, so which ones are worth pricing depends on your scenario. As of this writing, the table below reflects general focus areas, and availability and pricing vary by borrower and day.
| Wholesale lender (broker access) | General focus | Why the points math differs |
|---|---|---|
| The Loan Store | Lean, aggressive agency-product pricing | Agency loans with tight pricing can change how much each point buys |
| LoanUnited | Lean, aggressive agency-product pricing | Same loan, different price per point than other shops |
| NexBank | Jumbo, institutional-backed pricing | Larger balances make each point’s dollar cost much bigger |
| Angel Oak Mortgage Solutions | Non-QM and alternative-document lending | Non-QM pricing structures differ from agency ones |
Duane Buziak is an independent broker with wholesale relationships to these lenders. He is not affiliated with, endorsed by, or a division of any of them.
Step 6: Check the Result Against Your Loan Estimate and Lock
Once you choose a scenario, confirm that the final Loan Estimate matches it. The rate, the points percentage, and the dollar amount in Section A on page 2 should all agree with the numbers you ran. The CFPB’s Loan Estimate explainer shows where each item sits. If the points on paper are not the points you priced, stop and ask why before you lock.
Then confirm the lock itself:
- Ask that the lock cover the specific priced point structure, not just a rate.
- Note the lock period and its expiration date, and compare it with your expected closing date.
- Ask what an extension would cost if closing slips.
On fees, discount points fall in the category of charges that generally cannot increase from the Loan Estimate to closing without a valid changed circumstance. Read the current wording on the CFPB’s site for the precise tolerance rules, since the details are technical. If your points cost rises, that should come with an explanation you can point to.
This is also where working with an independent broker pays off. Duane Buziak can price the same scenario across multiple wholesale lenders, then run the buydown math for each, so you see break-even months side by side rather than a single lender’s version of the numbers. No broker can promise a rate or an approval. What you get is a clearer comparison, built on your actual credit, loan-to-value, and occupancy.
Turning Your Break-Even Month Into a Decision
You now have one number to check: the break-even month versus the time you realistically expect to keep the loan. If the break-even lands well inside that window and your reserves stay healthy, points may earn their cost. If it is close or beyond, take the higher rate or a lender credit and keep the cash.
If you would like a multi-lender points comparison for your own scenario, call Duane Buziak at Wholesale Mortgage Rates by Duane Buziak at 804-212-8663. Your dream home is within reach: discover how wholesale mortgage rates can put more money back in your pocket while you secure the financing you need. Get your personalized rate estimate today with no credit impact and see exactly what you qualify for with the Mortgage Maestro’s expert guidance.
One Response