Mortgage Points Break-Even Calculator
Find out if buying discount points makes financial sense — and exactly when you'll break even.
| Year | Monthly Savings | Annual Savings | Cumulative Savings | Net of Points Cost |
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How to Use This Mortgage Points Break-Even Calculator
Enter your loan amount, current interest rate, the reduced rate you'd receive after buying points, and how many points your lender is offering. Then tell us how long you plan to stay in the home. Hit "Calculate Break-Even" and you'll instantly see which month you recover your upfront cost — and how much you'll save (or lose) over your stay.
Adjust the sliders to experiment with different rate reductions and point quantities. The table shows year-by-year cumulative savings so you can pinpoint exactly when the math tips in your favor.
Why This Matters
Mortgage discount points are an upfront fee you pay your lender to permanently lower your interest rate. One point equals 1% of your loan amount — so on a $400,000 mortgage, two points costs $8,000 out of pocket at closing.
Whether that's a smart move depends almost entirely on how long you'll stay in the home. If you're buying a forever home, paying points often saves tens of thousands in interest over 30 years. But if you sell or refinance within five years, you may not even recover the upfront cost.
Consider a real scenario: On a $350,000 loan, dropping from 7.00% to 6.50% by buying 2 points ($7,000) saves about $107/month. Your break-even is roughly 65 months — just over 5 years. Stay 10 years and you net nearly $5,800 in savings. Stay 30 years and you're up over $31,000.
This calculator is especially useful for move-up buyers, people in competitive rate environments, and anyone comparing lender offers that bundle different rate/point combinations.
How It's Calculated
The monthly mortgage payment uses the standard amortization formula:
M = P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1]
Where P = principal, r = monthly rate (annual ÷ 12), n = number of monthly payments.
The monthly savings is simply the difference between the two payments (no-points rate vs. reduced rate). Points cost = loan amount × (points ÷ 100). Break-even month = points cost ÷ monthly savings (adjusted for any tax deduction on the points). Net savings at any point in time = (monthly savings × months elapsed) − points cost.
If you entered a marginal tax rate, we factor in the IRS benefit: mortgage points are often fully deductible in year 1 on a purchase loan, so the effective cost = points cost × (1 − tax rate).
Tips & Common Mistakes
- Don't forget refinance risk. If rates drop and you refinance within 3–5 years, you lose whatever points cost you didn't yet recover.
- Compare the actual lender offer. The rate reduction per point varies by lender and market — 0.25%/point is common, but some offer 0.125% or 0.375%. Always use your actual quote.
- Points vs. down payment tradeoff. Using cash to buy points instead of increasing your down payment may cost you more in PMI if you're under 20% LTV.
- Tax deductibility varies. Points on a purchase mortgage are usually deductible in full year 1; points on a refinance must be amortized over the loan life. Consult a tax professional.
- Use break-even, not total savings. Lenders sometimes advertise lifetime savings of $40,000+ — that's only relevant if you keep the original loan for 30 years, which most people don't.
Frequently Asked Questions
What is a mortgage discount point?
A discount point is a fee equal to 1% of your loan amount paid at closing in exchange for a permanently lower interest rate. Two points on a $300,000 loan costs $6,000 upfront. The rate reduction you get per point depends on your lender, loan type, and current market conditions.
How many points should I buy?
There's no universal answer — it depends on how long you'll stay and your cash position. Start by calculating break-even for each point increment your lender offers. If break-even is shorter than your expected stay, buying points is likely worthwhile. Buying more than 3–4 points is rarely cost-effective.
Are mortgage points tax deductible?
Generally yes, for primary residence purchase loans — you can typically deduct the full amount in the year paid if you itemize deductions. For refinance loans, the deduction is spread over the loan life. The rules have nuances, so verify with a CPA or IRS Publication 936.
What if I refinance before the break-even date?
You lose the unrecovered portion of your points cost. For example, if your break-even is month 60 and you refinance at month 36, you've effectively paid extra upfront for no net benefit. This is why break-even analysis is critical before buying points in a potentially declining rate environment.