California Data Methodology
Understanding how we source, verify, and analyze California IRS tax lien data helps you trust the intelligence we provide. This page explains our methodology, data sources, update frequency, and confidence levels.
Public Records Sources
California IRS tax lien data is sourced from multiple public record repositories:
- California Secretary of State — UCC filings and federal tax lien notices
- County Recorder Offices — Los Angeles, San Diego, Orange, San Francisco, and 6 additional high-volume counties
- IRS Public Data — Statistics of Income, Data Book, and enforcement trend reports
- California Franchise Tax Board — State tax lien cross-reference data
Update Frequency
Weekly
Lien filing counts
Monthly
County-level trends
Quarterly
Full dataset refresh
California Coverage Scope
Our California data covers the state's highest-volume counties for IRS enforcement activity:
Los Angeles County
San Diego County
Orange County
Riverside County
San Bernardino County
Santa Clara County
Alameda County
Sacramento County
San Francisco County
Contra Costa County
Confidence Levels
We assign confidence levels to all data points based on source reliability and verification status:
HIGHDirect public record match, verified within 30 days
MEDIUMAggregated from multiple sources, estimated range
DERIVEDCalculated from related data points, model-based
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