Essential Tax Invoice OCR Fields: Numbers, Dates & GSTIN
Automating B2B invoice processing requires extracting and validating mandatory statutory fields to claim input tax credits (ITC) and satisfy audit compliance.
1. Indian GSTIN 15-Character Structure
A Goods and Services Tax Identification Number (GSTIN) follows a strict statutory format:
[ 2 Digits State ][ 10 Alphanumeric PAN ][ 1 Entity ][ Z ][ 1 Check Digit ]Evaluating this pattern through automated regex validation eliminates invoice transcription errors.
2. Mandatory Invoice Fields Checklist
- Invoice Number: Unique alphanumeric identifier.
- Invoice Date: Standardized ISO 8601 calendar date (`YYYY-MM-DD`).
- Tax Breakdown: Split rows for CGST, SGST, and IGST amounts.
- Total Amount: Gross payable sum reconciled against line items.
Extract Your Invoices Automatically
Upload your B2B invoices to OCR-Doc-Parser for structured JSON extraction:
Launch OCR-Doc-Parser on Poe ↗