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India's only live
tax law API.

Every IT Act 2025 section, CBDT circular, GST notification, DTAA treaty and landmark ITAT/HC/SC judgment - queryable via REST. Use it in your own tools. Our agents quote from it while explaining decisions.

What you can query

IT Act 2025 Sections
521
/api/tax-law/sections?domain=ITR
DTAA Treaties
91
/api/tax-rules/dtaa
Landmark Judgments
105
/api/tax-law/case-laws
Circulars & Notifications
506
/api/tax-law/circulars?domain=ITR
Validation Checks
89
/api/tax-law/by-tag/validation-check
Form Renames
22
/api/tax-law/by-tag/form-rename

● All numbers above are live - fetched from /api/tax-law/stats at page-build time.

Endpoint examples

GET/v1/tax-law/sections/by-2025-ref/123
Forward lookup: 2025 section number → 1961 record(s). e.g. 123 → Section 80C.
REQUEST · cURL
curl https://api.thynktax.com/v1/tax-law/sections/by-2025-ref/123
RESPONSE · 200 OK
[
  {
    "reference": "Section 80C",
    "act_2025_ref": "123",
    "title": "Deduction for Investments & Payments",
    "category": "ACT_SECTION",
    "domain": "ITR",
    "effective_from": "2026-04-01",
    "tags": [
      "80c",
      "section-123",
      "PPF",
      "ELSS",
      "deduction"
    ]
  }
]
GET/v1/tax-rules/dtaa/US
DTAA treaty rates by ISO country code.
REQUEST · cURL
curl https://api.thynktax.com/v1/tax-rules/dtaa/US
RESPONSE · 200 OK
{
  "rule_key": "US",
  "name": "United States",
  "dividends": 15,
  "interest": 15,
  "royalties": 15,
  "fts": 15,
  "capital_gains": "mixed",
  "article_notes": "Article 12(4) covers included services / FTS"
}
GET/v1/tax-law/case-laws?domain=ITR&jurisdiction=SUPREME_COURT
Landmark Supreme Court judgments on income tax.
REQUEST · cURL
curl "https://api.thynktax.com/v1/tax-law/case-laws?domain=ITR&jurisdiction=SUPREME_COURT"
RESPONSE · 200 OK
[
  {
    "citation": "Vodafone International Holdings BV v. UOI [2012] 341 ITR 1 (SC)",
    "title": "Vodafone International",
    "jurisdiction": "SUPREME_COURT",
    "domain": "ITR",
    "effective_from": "2012-01-01",
    "tags": [
      "case-law",
      "section-9",
      "section-45"
    ]
  }
]
GET/v1/tax-law/by-tag/validation-check
All 200+ validation checks run by the agents.
REQUEST · cURL
curl https://api.thynktax.com/v1/tax-law/by-tag/validation-check
RESPONSE · 200 OK
[
  {
    "reference": "GST-3B-001",
    "title": "Output tax = sum of 3.1 boxes",
    "category": "RULE",
    "tags": [
      "validation-check",
      "severity-error",
      "gstr-3b"
    ]
  }
]
GET/v1/tax-law/stats
Live aggregate counters - used by this very page.
REQUEST · cURL
curl https://api.thynktax.com/v1/tax-law/stats
RESPONSE · 200 OK
{
  "sections": 521,
  "case_laws": 105,
  "circulars": 420,
  "notifications": 86,
  "validation_checks": 89,
  "form_renames": 22,
  "total": 1243
}

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