Extract data from tax exemption certificates

When a reseller buys stock it never intends to consume, or a nonprofit buys supplies for a charitable program, sales or value-added tax should not apply to the purchase. The proof that it does not is a tax exemption certificate: a document the buyer gives the seller so the seller can make a tax-free sale and defend it in an audit. It is not proof that tax has been paid, which is what a clearance certificate shows, and it is not a bill. It is a standing authorization tied to an exemption_type such as resale, nonprofit, government, or educational, and to the specific goods and jurisdiction it covers. The certificate lives or dies on a few fields. A California resale certificate for Cascade Retail Group LLC, EIN 47-1234567, issued under the California Revenue and Taxation Code and carrying resale_number SR EA 12-345678, is effective 2026-01-01 through an expiration_date of 2027-12-31 and covers merchandise purchased for resale from the supplier Northwind Wholesale Inc. A nonprofit certificate instead cites a governing_law such as IRC Section 501(c)(3), names the issuing_authority and jurisdiction, and states whether renewal is required and how often. The exemption_reason, the goods_services_description, and any conditions_restrictions decide exactly which purchases the seller may zero-rate, and getting the resale number or the covered category wrong is what turns a clean sale into an assessed liability later. Bound to the exemption schema, the certificate returns the exemption holder, the exemption type, the resale number, the jurisdiction, the covered goods, and the validity window as fields, while any usage history and condition breakdown stay as tables. From there, a resale certificate valid through 2027-12-31 loads into an accounts-payable or tax-engine record, so a seller’s team confirms the exemption type, the resale number, and the expiry from structured fields rather than filing a scanned form. Certificates are captured as written, with no view on whether an exemption is validly claimed.

What gets extracted from tax exemption certificates

How extraction works for tax exemption certificates

Exemption certificates come in as state resale forms, nonprofit determination letters, and cross-border VAT exemption documents, and the field that decides everything, the exemption type, is often a checkbox buried among addresses and signatures. Once classified, the certificate maps to the exemption model in the Field Registry, where exemption_type resolves to a canonical category (resale, nonprofit, government, educational, medical, religious, charitable) and the resale_number, the jurisdiction, and the goods_services_description are pulled into their own fields so a seller can match the exemption against the transaction. The effective_date and expiration_date parse to ISO 8601 and the renewal_requirement and renewal_frequency come back so a certificate that must be renewed annually does not sit expired in a vendor file. The exemption_holder, the supplier, and the buyer are separated, the governing_law citation such as IRC Section 501(c)(3) is captured, and the usage-history and conditions tables return as distinct structures. Provenance travels with every value as a confidence score and a source-region reference under DIN SPEC 91491, so an accounts-payable reviewer can confirm the resale number and the covered goods against the source certificate before zero-rating a sale.

Sample extraction

A state resale exemption certificate with a usage history

{
  "document_number": "EX-2026-90551",
  "document_date": "2026-01-01",
  "effective_date": "2026-01-01",
  "expiration_date": "2027-12-31",
  "exemption_holder.name": "Cascade Retail Group LLC",
  "exemption_holder.tax_id": "47-1234567",
  "exemption_holder.address": "2200 Harbor Blvd, Costa Mesa, CA 92626, USA",
  "exemption_type": "resale",
  "issuing_authority": "California Department of Tax and Fee Administration",
  "jurisdiction": "State of California",
  "exemption_reason": "Goods purchased for resale in the regular course of business",
  "goods_services_description": "Merchandise purchased for resale",
  "resale_number": "SR EA 12-345678",
  "certificate_status": "active",
  "governing_law": "California Revenue and Taxation Code Section 6091",
  "supplier.name": "Northwind Wholesale Inc.",
  "buyer.name": "Cascade Retail Group LLC",
  "renewal_requirement": true,
  "renewal_frequency": "annually",
  "currency": "USD",
  "exemption_usage_history": [
    {
      "transaction_date": "2026-03-14",
      "transaction_amount": 40000,
      "currency": "USD",
      "tax_avoided": 2900,
      "vendor": "Northwind Wholesale Inc.",
      "goods_services_purchased": "Bulk apparel inventory"
    },
    {
      "transaction_date": "2026-04-02",
      "transaction_amount": 25000,
      "currency": "USD",
      "tax_avoided": 1812.5,
      "vendor": "Northwind Wholesale Inc.",
      "goods_services_purchased": "Footwear inventory"
    }
  ],
  "exemption_conditions_breakdown": [
    {
      "condition_type": "sectoral",
      "condition_detail": "Exemption applies only to goods held for resale, not to consumables",
      "applies_globally": true,
      "verification_method": "self-certification"
    }
  ]
}

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