Calculate the break-even (cost of points ÷ monthly savings). If you'll hold past break-even, points usually win.

Calculator Guide

Mortgage Impact Analyzer

A 1% rate change can shift a deal from profitable to negative cash flow. The Mortgage Impact Analyzer shows the full ripple effect across payment, interest paid, and amortization schedule.

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Inputs

Loan Amount. Purchase price minus down payment.
Interest Rate. Annual percentage rate.
Term. Loan length in years (15, 20, 30).

Outputs

Monthly P&I. Principal and interest payment.
Total Interest. Lifetime interest paid over the loan term.
Amortization Chart. Year-by-year principal vs interest split.

Formulas

Monthly P&I

L × (r(1+r)^n) ÷ ((1+r)^n − 1), where r = monthly rate, n = months

Best Practices

Run scenarios at +/- 1% to understand rate risk before locking.

Common Pitfalls

Comparing 30-yr to 15-yr payments without accounting for the equity buildup difference.

Frequently Asked Questions

Should I pay points?: Calculate the break-even (cost of points ÷ monthly savings). If you'll hold past break-even, points usually win.