What is the points vs rate calculator — mortgage points break-even?
In short
Buying one mortgage point (1% of loan) typically reduces the interest rate by 0.25%. On a $400,000 loan, 1 point costs $4,000 and saves about $55/month. The break-even is ~73 months (6 years). If you sell or refinance before then, buying points costs more than it saves.
Calculates the dollar cost of buying mortgage discount points, monthly payment savings, and the break-even month when points pay off.
How to use this calculator
- 1Enter your loan amount.
- 2Enter the base interest rate (without buying points).
- 3Enter the lower rate you'd get by buying points.
- 4Enter the cost of the buy-down in points (1 point = 1% of loan).
- 5Enter loan term in years.
The formula
- L
- — Loan amount
- P
- — Points cost (% of loan)
- PMT₁
- — Base rate monthly payment
- PMT₂
- — Buy-down rate monthly payment
Worked example
The scenario
$400,000 loan, 7.25% base rate vs 7.00% with 1 point, 30-year term.
The result
Points cost = $4,000. Monthly savings = $66. Break-even = 61 months (5.1 years).
Common use cases
- Decide whether to pay points to lower your mortgage rate.
- Compare lender offers with different rate/point combinations.
- Evaluate a 2-1 buydown offer from a home builder.
- Plan how long you need to stay in the home for points to be worthwhile.
Limitations & assumptions
- Break-even assumes no refinancing before that point.
- Does not account for the opportunity cost of the upfront points payment.
- Tax deductibility of points varies by whether it's a purchase or refinance.
- ARM borrowers should be especially cautious since rates change regardless of points paid.
Frequently asked questions
Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.