Why state pages instead of one calculator?
Property tax and insurance are the two payment components people forget to localize — and they vary more than rates do. A $400,000 home carries about $743/month of tax in the highest-rate state but only $90 in the lowest; insurance spreads even wider (50-state average: $2,682/yr). Each state page preloads those defaults — sourced and dated — so the first number you see is already realistic for your market.
Data & sources: Effective property tax rate on owner-occupied housing, calendar year 2023 (Tax Foundation analysis of Census ACS data, published 2025). Typical home value, Zillow Home Value Index (ZHVI), 2025, rounded to the nearest $5,000. Average annual homeowners insurance premium for $300k dwelling coverage (Bankrate/Quadrant 2025), rounded to the nearest $50. State-level figures are planning defaults, not quotes: property taxes vary by county and city, insurance varies by home and insurer, and home values move monthly. Every value prefills the calculator but remains editable.