A comprehensive mortgage decision tool that takes in all relevant financial variables (current loan terms, income, proposed offers, investment returns, tax bracket) and models multiple scenarios side-by-side. The tool calculates true break-even points, total lifetime costs, monthly cash flow impacts, and compares mortgage paydown vs. investing alternatives—presenting clear recommendations with confidence intervals based on rate forecasts.

With mortgage rates fluctuating significantly from historic lows and many homeowners locked into 6-8% rates from 2023-2024, there's unprecedented demand for refinance analysis. The complexity of current offers (rate buydowns, no-cost refis with higher principal) makes manual comparison nearly impossible.