Buy-Down Rate Calculator

Mortgage buydowns let you pay upfront (or use a seller/lender credit) to lower the interest rate and monthly payment. They come in two flavors:

• Permanent buydown (“points”): you pay discount points at closing to reduce the note rate for the entire term.
• Temporary buydown (e.g., “2-1,” “1-0”): the rate is reduced for the first year(s), then returns to the original note rate.

The Buy-Down Rate Calculator shows—without guesswork—how much you save each month, how long until you break even, and the return on your upfront cost. It also handles temporary buydowns, revealing the subsidy cost and payment path. With a few entries, you can see which option fits your cash-on-hand, time horizon, and refinance plans.

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What this calculator does

• Compares permanent buydown vs. no buydown:
  • Monthly payment at base rate and reduced rate
  • Dollar savings per month and break-even months
  • NPV (net present value) and ROI of paying points, using your discount rate and expected holding period
• Models temporary buydowns (e.g., 2-1, 1-0):
  • Payment schedule by year (reduced then standard)
  • Total subsidy cost that must be funded by seller/lender/you
• Supports what-if scenarios: change loan amount, term, rates, points, and holding period to stress-test your choice

The goal: make the trade-offs transparent—so you don’t overspend on points you won’t recoup, or miss an opportunity with an exceptional ROI.

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Core formulas (kept simple)

Monthly principal & interest payment (level-payment loan):Pmt=L⋅r1−(1+r)−n\text{Pmt} = \frac{L \cdot r}{1-(1+r)^{-n}}Pmt=1−(1+r)−nL⋅r​

Where LLL is loan amount, rrr is monthly rate (annual rate ÷ 12), and nnn is total months.

Permanent buydown break-even (months):Break-even=Upfront CostMonthly Savings\text{Break-even} = \frac{\text{Upfront Cost}}{\text{Monthly Savings}}Break-even=Monthly SavingsUpfront Cost​

NPV of a buydown (over holding period HHH months, discount rate iii per year):NPV=∑k=1HMonthly Savings(1+i/12)k−Upfront Cost\text{NPV} = \sum_{k=1}^{H} \frac{\text{Monthly Savings}}{(1+i/12)^k} – \text{Upfront Cost}NPV=k=1∑H​(1+i/12)kMonthly Savings​−Upfront Cost

Temporary buydown subsidy (e.g., 2-1):
Sum of (base-rate payment − reduced-rate payment) for each subsidized month.

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Step-by-step: how to use the Buy-Down Rate Calculator

1. Select buy-down type
   • Permanent (points) or Temporary (2-1, 1-0, custom).
2. Enter basic loan terms
   • Loan amount (e.g., 400,000)
   • Base interest rate (e.g., 7.00%)
   • Term (e.g., 30 years)
3. If Permanent (points)
   • Enter reduced rate (or point cost and lender’s point-to-rate mapping).
   • Enter points cost (e.g., 1.5 points = 1.5% of loan).
   • (Optional) Holding period (years or months).
   • (Optional) Discount rate (your opportunity cost; e.g., 5%/yr).
   Outputs: base vs reduced payment, monthly savings, break-even months/years, NPV, ROI.
4. If Temporary (e.g., 2-1)
   • Enter the note rate and the reduction pattern (Year 1: −2%, Year 2: −1%).
   • Calculator shows payment by year and the total subsidy required.
   • Use this to negotiate seller credits or evaluate a lender-paid buydown.
5. Compare scenarios
   • Try “no points,” “1 point,” “1.5 points,” or “2-1 buydown.”
   • Check whether you’ll stay long enough to pass break-even.

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Practical example 1: Permanent buydown (points)

Scenario

• Loan amount: $400,000
• Term: 30 years (360 months)
• Base rate: 7.00%
• Offer: 1.5 points ($6,000) reduces rate to 6.50%

Payments

• Base 7.00% payment: $2,661.21/mo
• With buydown (6.50%): $2,528.27/mo
• Monthly savings: $2,661.21 − $2,528.27 = $132.94

Break-even$6,000÷$132.94≈45.1 months (≈3.8 years)\$6{,}000 \div \$132.94 \approx \textbf{45.1 months} \,(\approx 3.8 \text{ years})$6,000÷$132.94≈45.1 months(≈3.8 years)

If you expect to keep the mortgage ≥ 4 years, the buydown likely makes sense. If you’ll refinance or sell sooner, you may not recover the upfront cost.

Return & NPV (optional)
Assume you’ll keep the loan 7 years (84 months) and your opportunity cost is 5%/yr.

• NPV of monthly savings ≈ $9,405.60
• NPV net of cost ≈ $9,405.60 − $6,000 = $3,405.60
• IRR ≈ 21.8%/yr on the $6,000 spend (based on $132.94 monthly for 84 months)

Takeaway: If you stay long enough, points can deliver excellent ROI—but only if the break-even window fits your plans.

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Practical example 2: Temporary buydown (2-1)

Scenario

• Loan amount: $400,000
• Term: 30 years
• Note rate: 7.00%
• 2-1 buydown: Year 1 at 5.00%, Year 2 at 6.00%, then 7.00% thereafter

Payments

• Base (7.00%): $2,661.21/mo
• Year 1 at 5.00%: $2,147.29/mo → Savings = $513.92/mo
• Year 2 at 6.00%: $2,398.20/mo → Savings = $263.01/mo

Subsidy required(12×$513.92)+(12×$263.01)≈$9,323(12 \times \$513.92) + (12 \times \$263.01) \approx \textbf{\$9,323}(12×$513.92)+(12×$263.01)≈$9,323

That $9.3k must be funded (by seller, lender, or you) to offer the 2-1 buydown. The payment relief is front-loaded, which can ease your first-two-year budget if you expect income growth or a near-term refinance.

When to prefer a temporary buydown: You want lower payments now, expect a rate drop/refi soon, or have seller credits that can’t be used to reduce price further.

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Benefits & features at a glance

• Clear apples-to-apples comparisons across points, temporary buydowns, and doing nothing
• Precise break-even timing to avoid overspending on points
• ROI/NPV lens for financially rigorous decisions
• Temporary buydown modeling to quantify subsidy needs and payment relief
• What-if tools to test holding periods, refinance assumptions, and cash constraints
• Quick summaries you can paste into emails or loan worksheets

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Smart tips for using buydowns

• Match to your timeline. If you might sell/refi within 2–3 years, a temporary buydown or fewer points may be better than a deep permanent buydown.
• Use seller credits strategically. When price reductions are capped (e.g., appraisal risk), credits can fund a temporary buydown for near-term relief.
• Mind liquidity. Don’t drain reserves to buy points if it raises financial risk (emergencies matter).
• Check tax treatment. Points may be tax-deductible in some situations; consult a tax professional.
• Beware diminishing returns. Each additional point usually buys less rate reduction. Stop when break-even pushes past your likely holding period.
• Don’t ignore PMI and escrows. Payment comparisons should include all components of your monthly outlay.
• Ask for lender-paid alternatives. Sometimes a lender-paid buydown (slightly higher base rate with a credit) fits cash-tight scenarios.

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Common use cases

• First-time buyers needing payment relief the first 24 months
• Move-up buyers deciding between 1 vs. 2 points
• New-construction sellers/builders pricing 2-1 buydown incentives
• Refinancers weighing small points to push below a pricing tier
• Analytical shoppers comparing NPV/ROI across options

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FAQ (20 quick answers)

1. What is a “point”?
   One point equals 1% of the loan amount paid upfront to obtain a rate reduction.
2. How much does a point lower my rate?
   It varies by day and lender; often around 0.25% per point, but not guaranteed. Use the exact reduction offered.
3. What’s better: permanent or temporary buydown?
   Depends on your time horizon. Permanent favors longer holds; temporary helps near-term cash flow or planned refi.
4. How do I find break-even?
   Divide upfront cost by monthly savings from the lower rate.
5. What if I sell before break-even?
   You won’t fully recover the cost of points—temporary buydown may have been better.
6. Do temporary buydowns lower my rate forever?
   No. They step up to the note rate after the buydown years.
7. Who pays the temporary buydown subsidy?
   Typically seller or lender credits; sometimes the borrower.
8. Can I combine points with a temporary buydown?
   Sometimes—your note rate could be lower and you still use a 2-1 pattern. Model both costs.
9. What discount rate should I use for NPV?
   Use your opportunity cost (e.g., expected investment return or after-tax savings rate).
10. Is it worth buying points if I’ll refinance soon?
    Usually no—you may not pass break-even. Consider a temporary buydown instead.
11. Are points tax-deductible?
    In some cases, yes. Talk to a tax professional; rules depend on occupancy, purpose, and local regulations.
12. Do buydowns affect PMI?
    The interest rate helps payment and total interest, but PMI depends on LTV and loan program rules.
13. How do I compare 1 vs 2 points?
    Run both: check monthly savings, break-even, and NPV/ROI. Often the second point is less efficient.
14. Does a buydown change total interest paid?
    Yes. Lower rates reduce lifetime interest, especially if held long-term.
15. Can I roll points into the loan?
    Sometimes; this increases loan balance and may change the economics. The calculator assumes cash at closing unless you specify otherwise.
16. What if I make extra principal payments?
    Your break-even may arrive sooner because total interest shrinks, but monthly payment savings remain the same.
17. Are VA/USDA/FHA loans eligible for buydowns?
    Often yes, with program-specific rules. Confirm with your lender.
18. Is a 2-1 buydown risky?
    Payments step up after year 2; ensure your budget can handle the note-rate payment.
19. Can seller credits exceed subsidy cost?
    Excess credits may be applied to other closing costs, but program caps apply. Don’t leave credits unused.
20. What’s the fastest way to decide?
    Enter your loan amount, base rate, reduced rate/points, and holding period. Check break-even first; then NPV/ROI to confirm.

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Conclusion

A buydown is only “good” if it fits your horizon and cash flow. The Buy-Down Rate Calculator turns options into clear numbers—payment, break-even, NPV, and ROI—so you can choose confidently between no points, permanent points, or a temporary 2-1/1-0 structure. Run a few scenarios, align the results with your move/refi plans, and pick the path that saves you the most—when it matters to you.