Observed arrival · 2026-09-25
TaxCitation turns tax law into citable data
A REST API and MCP service for resolving, searching, and verifying citations across federal and selected state and local tax-law materials.
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- Tax professionals and developers building tax research workflows
- Worth noticing
- The inventory marks New York's 20 NYCRR regulations as in progress, while listing 4,597 New York law sections.
Field notes
Its schedule lists 2,454 federal code sections and 8,197 regulation sections, alongside IRS materials, Tax Court opinions, and state and local collections. One REST example returns citeId ca/rtc/19132, a normalized citation, pinpointFound true, jurisdiction US-CA, and in_force status; the New York 20 NYCRR collection is explicitly marked in progress.
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