Free research tool for tax lien & tax deed investing. Every state has different rules — lien vs. deed, redemption period, rate — and TaxLien.io puts all 50 states side by side, verified against the actual statute or county source, not scraped from an aggregator. Includes a sortable rate/redemption comparison (CSV/JSON export), a real county-sourced auction calendar, a redemption tracker, and free guides on recovering surplus funds after a sale. No paywall, no invented numbers.