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Mortgage Buy-Down Engine Discount Points • Breakeven Months • Refi Risk • S&P 500 Compounding

Mortgage Discount Points Breakeven Calculator

Calculate whether paying 1 to 2 discount points upfront at closing actually saves money before you move or refinance.

1. Loan Parameters & Base Rate

Mortgage Specs

2. Point Pricing & Rate Summary

At Closing
Upfront Cash Cost of Points: $4,500.00
New Bought-Down Interest Rate: 6.500% (-0.25%)
Discount Points Breakeven Point

59.8 Months (5.0 Years)

FAVORABLE (STAY > 5 YRS)
Monthly Savings

$75.25/mo

Lower P&I Payment
Horizon Profit

+$1,821

Over 7 Years
S&P 500 Compounding

$7,950

If Cash Invested
Refi Risk Window

60 Months

Loss if Refi Early
Mortgage Points Decision Verdict:

Because you plan to keep this mortgage for 7.0 years, you will recover your $4,500 point fee in 59.8 months and generate +$1,821 in net interest savings. However, if interest rates drop and you refinance before Year 5, buying points will result in a net cash loss.

Cumulative Net Savings Over Time

Tracking the crossing point from negative upfront fee into pure profit
Breakeven Curve
AI Mortgage Points & Refinance Strategist 100% Private to You

Click "Run AI Points Audit" to evaluate temporary seller-paid 2-1 buydowns (saving $400/mo in Year 1 without locking cash into permanent points) and IRS Schedule A tax deductibility.

Zero Data Access: Your loan numbers and interest rates execute 100% locally in your browser. Processed on-device

What this calculator does

The Mortgage Discount Points Breakeven Calculator helps prospective homebuyers and current homeowners determine if paying upfront fees to lower their interest rate is financially prudent. It evaluates your loan size, the cost of the discount points, and the proposed new rate to compute the exact break-even horizon. By illustrating the trade-off between upfront cash and long-term monthly savings, the tool clarifies the timeline required to recoup your investment. It also features a comparison against the S&P 500, enabling users to understand the opportunity cost of deploying cash at closing versus investing it in the broader market.

How the math works

The foundational logic of this calculator relies on standard mortgage amortization mathematics to compute the monthly principal and interest (P&I) obligations for both the base rate and the bought-down rate. The payment is calculated using the formula \( M = P \frac{r(1+r)^n}{(1+r)^n - 1} \), where \( P \) is the principal loan amount, \( r \) is the monthly interest rate, and \( n \) is the total number of payments.

To determine the break-even timeline, the total upfront cost of the discount points is divided by the monthly savings achieved by the lower interest rate. For example, one point typically costs 1% of the total loan amount and may lower the interest rate by 0.25%. Furthermore, the tool calculates opportunity cost by projecting the potential future value of the upfront cash if it were invested in a broad market index, assuming historical annualized returns. For official guidelines on mortgage rates and points, refer to the Consumer Financial Protection Bureau (CFPB). All figures reflect a 2026 lending environment.

Worked example

Suppose a borrower takes out a $500,000 mortgage on a 30-year fixed term. The lender offers a base rate of 6.50%, which results in a monthly P&I payment of $3,160. Alternatively, the borrower can pay for 2.0 discount points to lower the interest rate to 6.00%.

The cost of 2.0 points is 2% of $500,000, which equals $10,000 paid at closing. The new 6.00% rate lowers the monthly payment to $2,998, yielding a monthly savings of $162. To find the break-even point, we divide the $10,000 upfront cost by the $162 monthly savings, which equals approximately 62 months (just over 5 years). If the borrower plans to sell the property or refinance before 62 months, purchasing the points results in a net financial loss.

Frequently Asked Questions

Are mortgage discount points tax deductible?

For a primary home purchase, discount points are generally fully tax-deductible in the year they are paid on IRS Schedule A, provided you itemize deductions and meet specific IRS criteria. For a refinance, points must typically be amortized and deducted evenly over the life of the loan.

What is a temporary 2-1 buydown vs permanent points?

A temporary 2-1 buydown reduces your interest rate by 2% in the first year and 1% in the second year, before resetting to the fixed note rate in year three. Unlike permanent points, unused funds in a temporary buydown escrow account are generally credited back to your principal balance if you refinance early.

Can I roll the cost of points into my loan balance?

In a home purchase, points must typically be paid in cash at closing. During a refinance, some lenders allow you to roll the cost of discount points into the new loan balance, though this increases your overall principal and means you will pay interest on the cost of the points themselves.

Do seller credits cover discount points?

Yes, seller concessions can be used to pay for mortgage discount points. This is a common strategy in buyer's markets to lower the buyer's monthly payment without requiring the seller to drop the top-line purchase price.

Disclaimer: This tool is for educational and scenario-analysis purposes only and does not constitute financial, tax, legal, or investment advice. Mortgage rates, point pricing, and tax regulations are subject to change. Always consult a licensed CPA, financial advisor, or mortgage broker regarding your specific circumstances. Figures reflect 2026 statutory and market structures.

Built and verified by The Core-AI Engineering Desk — last reviewed August 2026. Calibrated strictly to 2026 statutory figures.

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